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30 seconds under normal circumstances and even minutes if you cool the RAM chips This is mainly a problem for DRAM memory, which uses a capacitor for each bit With a cold boot attack, a hacker powers off a computer and then boots it to a special program that copies the content of the memory to a USB key Then the hacker can scan the dump of the memory for the old information and extract keys that are used for the disk encryption There are some algorithms available that make nding the encryption keys among all the memory dumped quite easy

FIGURE 4-6 To turn off BitLocker, use Disable to avoid decrypting the entire drive To protect against cold boot attacks, exercise good physical security on your servers and disable booting from USB devices These measures cannot stop an attack, but they make an attack harder to accomplish If an attacker has the physical box, she can power it down, take out the RAM, and put it in another box (unless you solder the RAM to the motherboard) To protect against these attacks on laptops, power them off and do not leave them in sleep mode in public The use of a TPM does not help because the TPM stores the key initially and then puts it in memory to do decryption You can see a video of cold boot attacks in action at wwwhackaday com/2008/02/21/breaking-disk-encryption-with-ram-dumps/, and you can find a full paper on these attacks at http://citpprincetonedu/pub/ coldbootpdf

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Security Templates MMC snap-in, 187-189 SMB (Server Message Block) option, 182 Viewer, 180, 186 scwcmd command, converting security policies to GPO, 185 SDK (software development kits), SUA, 1569 searches Control Panel, 94 DFSN, 977 Windows Explorer, 81 seceditexe command-line tool, 187, 193-194 Secure Socket Tunneling Protocol (SSTP), 456, 473-477 SecureDC option (Security Templates MMC snap-in), 189 SecureWS option (Security Templates MMC snap-in), 189 security, 31-32 account policies Account Lockout Policy, 220-221 Kerberos Policy, 221-222 Password Policy, 219-220 AD FS (Active Directory Federation Services), 891 authentication, 894 claim mappings, 903 claims-aware agent installation, 897 FS (Federation Services), 892 FSP (Federation Service Providers), 893 installing, 895-901, 904-906

Web hooks are essentially callbacks for services When speaking of callbacks, developers are typically talking about methods or messages that are automatically fired on completion of some other process or event Most web developers are familiar with the typical case of using JavaScript in the browser to handle click, mouse, and other userinitiated events, such as onClick and onMouseOver In the Ruby world, a similar concept is built into ActiveRecord objects A series of callbacks are fired during the lifecycle events of ActiveRecord objects, including before_save, before_validation, and after_validation, after_save Suppose there is a resource in an application called Car, and the application requires some work to be done after every Car is created These tasks could be initiated using the following code:

Unfortunately, the universe, being very busy and unaccustomed to paying attention to individuals, had managed to replace Peter's boss's delegate with its own This was an unintended side effect of making the delegate fields public in Peter's Worker class Likewise, if Peter's boss got impatient, he could decide to fire Peter's delegates himself (which is just the kind of rude thing that Peter's boss was apt to do): // Peter's boss taking matters into his own hands if( petercompleted != null ) petercompleted(); Peter wanted to make sure that neither of these could happen He realized that he needed to add registration and unregistration functions for each delegate so that subscribers could add or remove themselves but couldn't clear the entire list or fire his events Instead of implementing these functions himself, Peter used the event keyword to make the C# compiler build these methods for him: class Worker { public event WorkStarted started; public event WorkProgressing progressing; public event WorkCompleted completed; } Peter knew that the event keyword erected a property around a delegate, allowing only clients to add or remove themselves (using the += and -= operators, if the client was written in C#), forcing his boss and the universe to play nicely: static void Main() { Worker peter = new Worker(); Boss boss = new Boss(); petercompleted += new WorkCompleted(bossWorkCompleted); peterstarted += new WorkStarted(UniverseWorkerStartedWork); petercompleted += new WorkCompleted(UniverseWorkerCompletedWork); peterDoWork(); ConsoleWriteLine("Main: worker completed work"); ConsoleReadLine(); }

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