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New hacks siphon private cryptocurrency keys from …

Enlarge / Simplified figurative process of a Cryptocurrency transaction.

Researchers have defeated a key protection against cryptocurrency theft with a series of attacks that transmit private keys out of digital wallets that are physically separated from the Internet and other networks.

Like most of the other attacks developed by Ben-Gurion University professor Mordechai Guri and his colleagues, the currency wallet exploits start with the already significant assumption that a device has already been thoroughly compromised by malware. Still, the research is significant because it shows that even when devices are airgappedmeaning they aren’t connected to any other devices to prevent the leaking of highly sensitive dataattackers may still successfully exfiltrate the information. Past papers have defeated airgaps using a wide array of techniques, including electromagnetic emissions from USB devices, radio signals from a computer’s video card, infrared capabilities in surveillance cameras, and sounds produced by hard drives.

On Monday, Guri published a new paper that applies the same exfiltration techniques to “cold wallets,” which are not stored on devices connected to the Internet. The most effective techniques take only seconds to siphon a 256-bit Bitcoin key from a wallet running on an infected computer, even though the computer isn’t connected to any network. Guri said the possibility of stealing keys that protect millions or billions of dollars is likely to take the covert exfiltration techniques out of the nation-state hacking realm they currently inhabit and possibly bring them into the mainstream.

“I think that the interesting issue is that the airgap attacks that were thought to be exotic issues for high-end attacks may become more widespread,” he wrote in an email. “While airgap covert channels might be considered somewhat slow for other types of information, they are very relevant for such brief amounts of information. I want to show the security of ‘cold wallet’ is not hermetic given the existing airgap covert channels.”

One technique can siphon private keys stored in a cold wallet running on a Raspberry Pi, which many security professionals say is one of the best ways to store private cryptocurrency keys. Even if the device became infected, the thinking goes, there’s no way for attackers to obtain the private keys because it remains physically isolated from the Internet or other devices. In such cases, users authorize a digital payment in the cold wallet and then use a USB stick or other external media to transfer a file to an online wallet. As the following video demonstrates, it takes only a few seconds for a nearby smartphone under the attacker’s control to covertly receive the secret key.

BeatCoin: Leaking bitcoin’s private keys from air-gapped wallets.

The technique works by using the Raspberry Pi’s general-purpose input/output pins to generate radio signals that transmit the key information. The headphones on the receiving smartphone act as an antenna to improve the radio-frequency signal quality, but in many cases they’re not necessary.

A second video defeats a cold wallet running on a computer. It transmits the key by using inaudible, ultrasonic signals. Such inaudible sounds are already being used to covertly track smartphone users as they move about cities. It wouldn’t be a stretch to see similar capabilities built into malware that’s designed to steal digital coins.

BeatCoin: Leaking bitcoin’s private keys from air-gapped wallets.

As already mentioned, the exfiltration techniques described in this post assume the device running the cold wallet is already infected by malware. Still, the widely repeated advice to use cold wallets is designed to protect people against this very scenario.

“We show that, despite the high degree of isolation of cold wallets, motivated attackers can steal the private keys out of the air-gapped wallets,” Guri wrote in the new paper. “With the private keys in hand, an attacker virtually owns all of the currency in the wallet.”

To protect keys, people should continue to store them in cold wallets whenever possible, but they should consider additional safeguards, including keeping cold wallets away from smartphones, cameras, and other receivers. They should also shield cold-wallet devices with metallic materials that prevent electromagnetic radiation from leaking. Of course, people should also prevent devices from becoming infected in the first place.

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The Internet Security Academy – SAHCOM Technologies LLP

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The Internet of Things Security Foundation (IoTSF), a collaborative initiative aimed at addressing concerns regarding the security of IoT, launched publicly in London this week. The foundations executive board includes security experts and several technology organizations, including BT, Vodafone, Imagination Technologies, Royal Holloway University of London, Copper Horse Solutions, Secure Thingz, NMI and PenTest Partners. Read more about IoT Security Foundation Launches[]

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What Is Cryptocurrency? – dummies

By Tiana Laurence

Part of Blockchain For Dummies Cheat Sheet

Cryptocurrencies, sometimes called virtual currencies, digital money/cash, or tokens, are not really like U.S. dollars or British pounds. They live online and are not backed by a government. Theyre backed by their respective networks. Technically speaking, cryptocurrencies are restricted entries in a database. Specific conditions must be met to change these entries. Created with cryptography, the entries are secured with math, not people.

Restricted entries are published into a database, but its a special type of database that is shared by a peer-to-peer network. For example, when you send some Bitcoin to your friend Cara, youre creating and sending a restricted entry into the Bitcoin network. The network makes sure that you havent not the same entry twice; it does this with no central server or authority. Following the same example, the network is making sure that you didnt try to send your friend Cara and your other friend Alice the same Bitcoin.

The peer-to-peer network solves the double-spend problem (you sending the same Bitcoin to two people) in most cases by having every peer have a complete record of the history of all the entries made within the network. The entire history gives the balance of every account including yours. The innovation of cryptocurrency is to achieve agreement on what the history is without a central server or authority.

Entries are the representation of cryptocurrency.

Cryptocurrencies are generated by the network in most cases to incentivize the peers, also known as nodes and miners, to work to secure the network and check entries. Each network has a unique way of generating them and distributing them to the peers.

Bitcoin, for example, rewards peers (known as miners on the Bitcoin network) for solving the next block. A block is a group or entries. The solving is finding a hash that connects the new block with the old one. This is where the term blockchain came from. The block is the group of entries, and the chain is the hash. Hashes are a type of cryptologic puzzle. Think of them as Sudoku puzzles that the peers compete to connect the blocks.

Every cryptocurrency is a little different, but most of them share these basic characteristics:

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Cryptocurrency Market Surges to $365 Billion, Start of a …

Throughout this week, as CCN reported, the cryptocurrency market has been eyeing a move towards the $350 billion region. Earlier today, on April 20, strong performances of major cryptocurrencies like bitcoin and Ethereum have led the valuation of the cryptocurrency market to surge to $365 billion.

Throughout 2018, amidst extreme volatility and recovery, investors inclined towards bitcoin as the safe haven asset. With the deepest liquidity and largest volume in the global market, bitcoin was able to sustain some stability while many cryptocurrencies recorded a free fall. Most assets declined by more than 80 percent from their all-time highs and struggled to record gains against bitcoin.

Over the past seven days, alternative cryptocurrencies (altcoins) and other major cryptocurrencies have consistently reported gains against the most dominant cryptocurrency in the market. The daily trading volume of the global cryptocurrency market crossed the $20 billion mark for the first time in April and the valuation of the market achieved a new monthly high.

In March and early April, investors were skeptical towards investing in cryptocurrencies other than bitcoin and Ethereum because they were uncertain about the short-term future of the cryptocurrency market. While altcoins tend to have intensified movements on the upside, it also has larger movements on the downside, and investors thought the risk was not worth taking.

Traders have started to take more risk than before by investing in cryptocurrencies like Ripple, Zilliqa, Nano, OmiseGo and others. As the volumes of altcoins across major exchanges surged, altcoins began to outperform bitcoin on a weekly basis, and it is possible that ERC20 tokens outperform major cryptocurrencies on a monthly basis by the end of April.

The next major target for the cryptocurrency market is the $400 billion mark and by surpassing that threshold, the cryptocurrency market would achieve a two-month high. At this juncture, it is safe to conclude that bitcoin has bottomed out at $6,000 and the market has begun a rapid recovery to its previous levels.

If the bitcoin price breaks the $9,500 level in the short-term, ideally within the next week, it is entirely possible that the cryptocurrency market surpasses $400 billion within April, in the next 10 days.

The Relative Strength Index (RSI) of bitcoin is in the 57 range and is signifying a neutral zone. Bitcoin is neither oversold or overbought based on current levels, as demonstrated by two momentum oscillators RSI and Williams Percent Range.

Both simple and exponential moving averages are indicating buy signals for bitcoin, as it continues to gain strong momentum. From this point, traders are expecting the bitcoin price to cross $8,500 and potentially make its way into the $9 billion region.

Non-ERC20 tokens like Ripple and Verge were the best performers on April 20, with solid 20 percent gains. Both Ripple and Verge have performed strong against bitcoin throughout April and they are continuing to build momentum against bitcoin and Ethereum.

Featured image from Shutterstock.

The post Cryptocurrency Market Surges to $365 Billion, Start of a Bull Rally? appeared first on CCN.

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These files can’t be opened. Your Internet security …

OS: Windows 7 Ultimate 32 bit With UAC Disabled

Hi there,

I turned on my computer this morning and suddenly all ____ has broken loose. Every time I try and open an exe file I get a Windows Security alert box telling me that:

“These files can’t be opened. Your Internet security settings prevented one or more files from being opened.”

I’ve read through every thread I can find on the topic and none of the “answers” have worked for me.

I have tried the following common “solutions” with no luck:

1) Right click the exe, click PropertiesClick the Unblock buttonClick OK

2) Adding exe to Control Pannel > Windows Defender > Tools > Options > Excluded file types

3) Start / Control Panel / Internet Options.(Internet Options control panel appears)Click “Security” tab.Click “Local Intranet”Drag slider to “Low”Click “Sites” button.Click “Advanced” button.Enter the IP Address of the NAS / SMB/ CIFS / whatever server and click “Add.”Click “Close”

4) Remove the registry key – HKEY_CURRENT_USERSoftwareMicrosoftWindowsCurrentVersionExplorerFolderTypes{EF87B4CB-F2CE-4785-8658-4CA6C63E38C6}TopViews{00000000-0000-0000-0000-000000000000}

5) Creating a completely new admin profile. – This one was interesting, when I logged into the account there was no aero theme – it went right back to basics.

So any ideas?

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How to Uninstall Norton Internet Security: 12 Steps

Steps

Part 1

1

Open the Control Panel. You can uninstall Norton Internet Security through the Control Panel, much like any other program. You can find the Control Panel in the Start menu, or by searching for “control panel”.

2

3

Find Norton Internet Security. Scroll through the list until your find Norton Internet Security. Click on it, and then click the Uninstall button at the top of the list. Follow the prompts to remove Norton Internet Security.

4

5

Reboot your computer. After removing the programs, reboot your computer to finish the uninstallation. If you encountered any errors during the uninstallation process, see the next section.

Part 2

1

2

3

4

5

Part 3

1

2

How do I remove Norton Safe Search?

wikiHow Contributor

Go to your control panel, then click” programs”, scroll down, and select “Norton”. Right click and delete the application.

How do I remove administrative privileges on my Windows Vista computer?

Aiden Martinez

Just create another account in Control Panel -> User Accounts and make it a non-admin account. You do not want to delete your admin account.

Ask a Question

Thanks to all authors for creating a page that has been read 273,931 times.

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Internet Security Software at Office Depot OfficeMax

Protect your family or your business with Internet security suite software designed to work with numerous devices and prevent various types of online threats. For home use, look for programs with integrated parental controls and monitoring, as well as protection against viruses, spyware, fishing and risky websites. For business use, look for software that can be installed on multiple computers or mobile devices quickly and easily and managed from a single online hub. Be sure to review our entire assortment of software and books, including more antivirus software choices.

With multiple family members and multiple computers and devices, you need Internet security software that accommodates all of the equipment and security considerations you may have. Many of the Internet security system suites in our assortment can be easily installed on multiple devices and include antivirus software, antispyware software, prevention from clicking harmful links in browsers or e-mail and a two-way firewall, preventing unauthorized access to your systems. If you have children, you may wish to consider a program with integrated parental controls, including options for recording or blocking e-mail, chat, instant messages or website visits.

We carry several Internet security suite options designed to accommodate the special needs of small businesses. Look for programs that can be easily installed on several computers and mobile devices with just an e-mail and then managed from a single web portal, for greater efficiency. Opt for programs that include firewall protection, as well as those that block viruses, malware, spam and more.

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BTCMANAGER | Bitcoin, Blockchain & Cryptocurrency News

Category: Bitcoin, Commentary, News

A Singaporean citizen who orchestrated a robbery during a bitcoin sale is to be jailed, according to reports from local police on April 12, amidst a wave of crypto-related thefts occurring outside of the cybersphere. In recent times cryptocurrency-related crimes have been on a steady increase in tandem with the sudden surge in the value of bitcoin and the wider

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Category: Business, Ethereum, News

Popular cryptocurrency exchange Coinbase has acquired Cipher Browser for an undisclosed amount. The announcement of the acquisition was made official on April 13, 2018. The company in question, Cipher, had once competed with Coinbase-developed Toshi Ethereum browser. This acquisition is the first instance in which Coinbase has shelled cash to buy out a smaller rival company. Cipher to Merge with

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Category: Moonshot

Each week BTCManager and JaketheCryptoKing are going to explore a new moonshot opportunity. We are in week 12 of this moonshot experiment! Markets just suffered a sharp correction providing the perfect opportunity for some moonshot shopping at discounted prices. The moonshot for the week beginning April 15, 2018, is; KMD. What is a Moonshot? A moonshot is an altcoin that

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Category: Altcoins, Commentary, Finance, News

In an interview with CNBC, a senior executive of Ripple said the companys native XRP token is not a security. The statement comes after widespread speculation regarding the digital tokens listing on Coinbase, which follows strict guidelines and strives to remain legally compliant. Cryptocurrencies Are Securities, Says SEC According to the U.S. Securities and Exchange Commission (SEC), general security laws

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Category: Bitcoin, Commentary, News

Craig Wright, the self-proclaimed Satoshi Nakamoto, has recently been accused of plagiarism. Apparently, Wright has already tried to steal an identity, this time, he stands accused of taking someone elses ideas and passing them off as his own. It all begins with a paper Wright released in July 2017. The Fallacy of Selfish Mining: A Mathematical Critique is a paper

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Category: Bitcoin, Business, News, Tech

Coinsecure, one of the most popular bitcoin exchanges in India, announced it had 438.3186 bitcoin (BTC) around $3.6 million at current exchange rates stolen from the companys main wallet on Friday, April 13. To spice up the story even further, the exchange is accusing its own CSO, Dr. Amitabh Saxena, of the theft. Mohit Kalra, the CEO of

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Category: ICO News

In a comprehensive solution to users ability to employ a cryptocurrency debit card, the HashCard project is offering a crypto-linked card that will enable traditional card payments but with digital currencies. With a prospective client base of millions of users, the HashCard ICO is an answer to the noted desire of many to enjoy traditional transactional methods when spending cryptocurrency.

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Category: Altcoins, Business, Finance, News

After the recent tiff involving Alibabacoin and e-commerce giant Alibaba, wherein the latter sued Alibabacoin for misuse of their name, Taobao, a subsidiary of Alibaba, has banned all things crypto on its website. Taobao Bars Crypto Services Taobao has updated its list of goods and services that are barred from being sold on their platform, and it includes all services

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Category: Bitcoin, Commentary, News

A new trend is spreading like wildfire among the growing crop of bitcoin millionaires, which is buying flashy Lamborghinis to showcase their cryptocurrency wealth. The craze has fueled the popular When Lambo? meme in cryptocurrency circles. When Lambo refers to the point at which a crypto holder has amassed enough bitcoin (BTC) to buy a Lamborghini, whose prices typically start

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Garzik Forks UnitedBitcoin Away from "Maximalists" to Support Altcoin …

A new project called UnitedBitcoin (warning: the site autoplays audio) promises to add smart contract features using the UTXO model, support for the lightning network and SegWit, and eight-megabyte blocks. Headed up by Jeff Garzik, the lead developer behind the failed SegWit2x hard fork, along with Matthew Roszak and SongXiu Hua, this UnitedBitcoin (UB) hard fork will offer replay protection to prevent people from accidentally spending their coins on both the Bitcoin and the UnitedBitcoin blockchains.

Garzik told Bitcoin Magazine that 10% of the total worldwide SHA-256 hash power has moved to the new UB network, with much of the support coming from China and older mining equipment that was no longer profitable due to the escalating difficulty in mining bitcoin. He noted that UB is already supported on the ZB and EXX exchanges.

The UB white paper outlines how lost bitcoins have created deflationary pressure that has pushed the price up. Because those bitcoins are out of circulation, the supply is further decreased. One of the issues that UB seeks to address is to find a purpose both for those lost bitcoins and for inactive wallets by creating a stable cryptocurrency linked to their addresses.

All active Bitcoin addresses will receive the same balance on the UB chain, much like previous forks. The balances of UB on inactive addresses, however, will be confiscated by the UB Foundation and used to serve the community.

Inactive addresses are defined in the white paper as addresses without activity since block height #494000 (November 11, 2017) and as a result didnt automatically receive UBTC during phase 1 of the asset allocation procedure.

UB does not distinguish between an inactive address and one which is simply being used by a long-time “hodler.”

There is no difference. An inactive account is an inactive account, said Garzik. Like during [the] Ethereum new coin creation, you had to take a proactive step, otherwise you got zero [ether]. This is normal for new token creation new chain, new ERC20, but different from all other Bitcoin Forks. We are trying to do something new and different.

Anyone with a prior balance of 0.01 BTC in an inactive address at the time of the November 11 fork can still get UB tokens, so long as they are willing to take such a proactive step: that is, they make at least one transfer to their own Bitcoin address between Block 498,777 and Block 501,878 (December 12, 2017, to 12:00 GMT on January 3, 2018).

Only the original address can make the transfer to itself, and the receiving address must be used as one of the sending (input) addresses.

One privacy issue to consider is that in order to proactively claim BU tokens, the protocol forces users to reuse their Bitcoin addresses; this action puts privacy at risk and, unless it is done carefully, may link many of the users coins together.

User privacy protection is not the only part of the protocol that is drawing criticism, however.

The code contains a god mode; its literally called that, Blockchain developer Sjors Provoost said to Bitcoin Magazine. He said that it appears as if this god mode will create a multisignature address that belongs to a (yet-to-be-defined) UnitedBitcoin Foundation.

Unlike previous airdrops, the initial coin distribution is not determined by a consensus rule, he added. This means that even if you were to run the full UB node software (which you should not), you will have no way of knowing for sure how many coins you get. Conversely, if you already had bitcoin, you wont know how many of your coins will be confiscated. You simply have to trust their promise to take and redistribute coins as their marketing promises.

According to Provoost, the new consensus rule allows the owner of this foundation address to spend any UTXO they want. These confiscations will be included in holy blocks, which can be created during the first 500 blocks after the fork. This is how they implement the redistribution as I just described, but they can do much more.

Furthermore, Provoost is concerned about the quality of the code itself. Garziks previous project SegWit2x tried to keep its changes relative to Core to a bare minimum. Although at the time of the planned fork their code base was about a year behind Bitcoin Core, it didnt introduce many changes, he pointed out.

UnitedBitcoin on the other hand has introduced far more changes, making the task of tracking Bitcoin Core far more difficult. Its not as many changes as Bitcoin Unlimited and Bitcoin Cash, and the problem is somewhat mitigated by them sunsetting the more complicated consensus changes like god mode. However, even the small change in SegWit2x had a widely publicized serious bug in it and there are rumors of more.

Garzik has plans to build a better Tether by using the UB reserve, funded by coins reclaimed from inactive addresses. According to the project, 70 percent of confiscated UB coins will be held as collateral to issue stable tokens pegged to a fiat currency.

The UB reserve can be used as a backing asset for a stable, non-volatile currency, said Garzik. This is auditable and transparent and on the blockchain. It will be over-collateralized, 200300% to maintain the stability even in the face of a volatile price of the reserve.

The remaining 30 percent of the confiscated coins will support another new feature: owners of QTUM, H-shares and ether will receive a share of the remaining redistributed UB.

According to Garzik, the specific claim process for the redistribution of UB has yet to be determined. The UB board is still being put in place things are moving very fast and this will include more specifics on governance and community allocations.

The scheduled timeline of what has been released and what is coming breaks down as follows:

Fork of Bitcoin to UnitedBitcoin (at block height #498,777) with support for:

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Transparent Data Encryption (TDE) – msdn.microsoft.com

Updated: November 23, 2015

Transparent Data Encryption (TDE) encrypts SQL Server and Azure SQL Database data files, known as encrypting data at rest. You can take several precautions to help secure the database such as designing a secure system, encrypting confidential assets, and building a firewall around the database servers. However, in a scenario where the physical media (such as drives or backup tapes) are stolen, a malicious party can just restore or attach the database and browse the data. One solution is to encrypt the sensitive data in the database and protect the keys that are used to encrypt the data with a certificate. This prevents anyone without the keys from using the data, but this kind of protection must be planned in advance.

TDE performs real-time I/O encryption and decryption of the data and log files. The encryption uses a database encryption key (DEK), which is stored in the database boot record for availability during recovery. The DEK is a symmetric key secured by using a certificate stored in the master database of the server or an asymmetric key protected by an EKM module. TDE protects data “at rest”, meaning the data and log files. It provides the ability to comply with many laws, regulations, and guidelines established in various industries. This enables software developers to encrypt data by using AES and 3DES encryption algorithms without changing existing applications.

Encryption of the database file is performed at the page level. The pages in an encrypted database are encrypted before they are written to disk and decrypted when read into memory. TDE does not increase the size of the encrypted database.

Information applicable to SQL Database

When using TDE with SQL Database V12 V12 (Preview in some regions) the server-level certificate stored in the master database is automatically created for you by SQL Database. To move a TDE database on SQL Database you must decrypt the database, move the database, and then re-enable TDE on the destination SQL Database. For step-by-step instructions for TDE on SQL Database, see Transparent Data Encryption with Azure SQL Database.

The preview of status of TDE applies even in the subset of geographic regions where version family V12 of SQL Database is announced as now being in general availability status. TDE for SQL Database is not intended for use in production databases until Microsoft announces that TDE is promoted from preview to GA. For more information about SQL Database V12, see What’s new in Azure SQL Database.

Information applicable to SQL Server

After it is secured, the database can be restored by using the correct certificate. For more information about certificates, see SQL Server Certificates and Asymmetric Keys.

When enabling TDE, you should immediately back up the certificate and the private key associated with the certificate. If the certificate ever becomes unavailable or if you must restore or attach the database on another server, you must have backups of both the certificate and the private key or you will not be able to open the database. The encrypting certificate should be retained even if TDE is no longer enabled on the database. Even though the database is not encrypted, parts of the transaction log may still remain protected, and the certificate may be needed for some operations until the full backup of the database is performed. A certificate that has exceeded its expiration date can still be used to encrypt and decrypt data with TDE.

Encryption Hierarchy

The following illustration shows the architecture of TDE encryption. Only the database level items (the database encryption key and ALTER DATABASE portions are user-configurable when using TDE on SQL Database.

To use TDE, follow these steps.

Create a master key

Create or obtain a certificate protected by the master key

Create a database encryption key and protect it by the certificate

Set the database to use encryption

The following example illustrates encrypting and decrypting the AdventureWorks2012 database using a certificate installed on the server named MyServerCert.

The encryption and decryption operations are scheduled on background threads by SQL Server. You can view the status of these operations using the catalog views and dynamic management views in the list that appears later in this topic.

Backup files of databases that have TDE enabled are also encrypted by using the database encryption key. As a result, when you restore these backups, the certificate protecting the database encryption key must be available. This means that in addition to backing up the database, you have to make sure that you maintain backups of the server certificates to prevent data loss. Data loss will result if the certificate is no longer available. For more information, see SQL Server Certificates and Asymmetric Keys.

The TDE certificates must be encrypted by the database master key to be accepted by the following statements. If they are encrypted by password only, the statements will reject them as encryptors.

Altering the certificates to be password-protected after they are used by TDE will cause the database to become inaccessible after a restart.

The following table provides links and explanations of TDE commands and functions.

The following table shows TDE catalog views and dynamic management views.

Each TDE feature and command has individual permission requirements, described in the tables shown earlier.

Viewing the metadata involved with TDE requires the VIEW DEFINITION permission on the certificate.

While a re-encryption scan for a database encryption operation is in progress, maintenance operations to the database are disabled. You can use the single user mode setting for the database to perform the maintenance operation. For more information, see Set a Database to Single-user Mode.

You can find the state of the database encryption using the sys.dm_database_encryption_keys dynamic management view. For more information, see the “Catalog Views and Dynamic Management Views”section earlier in this topic).

In TDE, all files and filegroups in the database are encrypted. If any filegroups in a database are marked READ ONLY, the database encryption operation will fail.

If a database is being used in database mirroring or log shipping, both databases will be encrypted. The log transactions will be encrypted when sent between them.

Any new full-text indexes will be encrypted when a database is set for encryption. Previously-created full-text indexes will be imported during upgrade and they will be in TDE after the data is loaded into SQL Server. Enabling a full-text index on a column can cause that column’s data to be written in plain text onto the disk during a full-text indexing scan. We recommend that you do not create a full-text index on sensitive encrypted data.

Encrypted data compresses significantly less than equivalent unencrypted data. If TDE is used to encrypt a database, backup compression will not be able to significantly compress the backup storage. Therefore, using TDE and backup compression together is not recommended.

The following operations are not allowed during initial database encryption, key change, or database decryption:

Dropping a file from a filegroup in the database

Dropping the database

Taking the database offline

Detaching a database

Transitioning a database or filegroup into a READ ONLY state

The following operations are not allowed during the CREATE DATABASE ENCRYPTION KEY, ALTER DATABASE ENCRYPTION KEY, DROP DATABASE ENCRYPTION KEY, or ALTER DATABASE…SET ENCRYPTION statements.

Dropping a file from a filegroup in the database.

Dropping the database.

Taking the database offline.

Detaching a database.

Transitioning a database or filegroup into a READ ONLY state.

Using an ALTER DATABASE command.

Starting a database or database file backup.

Starting a database or database file restore.

Creating a snapshot.

The following operations or conditions will prevent the CREATE DATABASE ENCRYPTION KEY, ALTER DATABASE ENCRYPTION KEY, DROP DATABASE ENCRYPTION KEY, or ALTER DATABASE…SET ENCRYPTION statements.

The database is read-only or has any read-only file groups.

An ALTER DATABASE command is executing.

Any data backup is running.

The database is in an offline or restore condition.

A snapshot is in progress.

Database maintenance tasks.

When creating database files, instant file initialization is not available when TDE is enabled.

In order to encrypt the database encryption key with an asymmetric key, the asymmetric key must reside on an extensible key management provider.

Enabling a database to use TDE has the effect of “zeroing out” the remaining part of the virtual transaction log to force the next virtual transaction log. This guarantees that no clear text is left in the transaction logs after the database is set for encryption. You can find the status of the log file encryption by viewing the encryption_state column in the sys.dm_database_encryption_keys view, as in this example:

For more information about the SQL Server log file architecture, see The Transaction Log (SQL Server).

All data written to the transaction log before a change in the database encryption key will be encrypted by using the previous database encryption key.

After a database encryption key has been modified twice, a log backup must be performed before the database encryption key can be modified again.

The tempdb system database will be encrypted if any other database on the instance of SQL Server is encrypted by using TDE. This might have a performance effect for unencrypted databases on the same instance of SQL Server. For more information about the tempdb system database, see tempdb Database.

Replication does not automatically replicate data from a TDE-enabled database in an encrypted form. You must separately enable TDE if you want to protect the distribution and subscriber databases. Snapshot replication, as well as the initial distribution of data for transactional and merge replication, can store data in unencrypted intermediate files; for example, the bcp files. During transactional or merge replication, encryption can be enabled to protect the communication channel. For more information, see Enable Encrypted Connections to the Database Engine (SQL Server Configuration Manager).

FILESTREAM data is not encrypted even when TDE is enabled.

Files related to buffer pool extension (BPE) are not encrypted when database is encrypted using TDE. You must use file system level encryption tools like Bitlocker or EFS for BPE related files.

TDE can be enabled on a database that has In-Memory OLTP objects. In-Memory OLTP log records are encrypted if TDE is enabled. Data in a MEMORY_OPTIMIZED_DATA filegroup is not encrypted if TDE is enabled.

Move a TDE Protected Database to Another SQL ServerEnable TDE Using EKMTransparent Data Encryption with Azure SQL DatabaseSQL Server EncryptionSQL Server and Database Encryption Keys (Database Engine)Security Center for SQL Server Database Engine and Azure SQL DatabaseFILESTREAM (SQL Server)

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Transparent Data Encryption (TDE) – msdn.microsoft.com

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