word in a memorable phrase. One way to reduce this risk is to store only a cryptographic hash of each password instead of the password itself. If a password has been compromised, requiring it to be changed regularly should limit the access time for the attacker. Contents, password creation edit, passwords are created either automatically (using randomizing equipment) or by a human; the latter case is more common. Georgia Tech Research Institute developed a method of using, gpgpu to crack passwords much faster.
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In 1999, an Electronic Frontier Foundation project broke 56-bit DES encryption in less than a day using specially designed hardware. 14 Required bits of entropy edit The minimum number of bits of entropy needed for a password depends on the threat model for the given application. According to one study involving half a million users, the average password entropy was estimated.54 bits. This predictability means that the increase in password strength is minor when compared to random passwords. Bruce Schneier (December 14, 2006). Archived (PDF) from the original. However, knowledge of the hash value lets the attacker quickly test guesses offline. For example, a domain administrator password compromised in the DigiNotar attack was reportedly [email protected] 15 Their answers vary between 29 bits of entropy needed if only online attacks are expected, and up to 96 bits of entropy needed for important cryptographic keys used in applications like encryption where the password or key needs to be secure for a long. Some systems impose a time-out of several seconds after a small number (e.g. League of Professional Systems Administrators.
Password strength - Wikipedia
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