![]() ![]() Whether or not quantum computers will be able to do so in practice is still unknown, though theoretical analysis suggests such possibilities.Īs a result, there can be no exact answer to the somewhat different problem of the password strength required to resist brute force attack in practice. Due to currently understood limitations from fundamental physics, there is no expectation that any digital computer (or combination) will be capable of breaking 256-bit encryption via a brute-force attack. As of October 12, 2011, estimates that cracking a 72-bit key using current hardware will take about 45,579 days or 124.8 years. In 2002, cracked a 64-bit key in 4 years, 9 months, and 23 days. In 1999, an Electronic Frontier Foundation project broke 56-bit DES encryption in less than a day using specially designed hardware. The problem is not the same since these approaches involve astronomical numbers of trials, but the results are suggestive for password choice. Some basic benchmarks have been established for brute force searches in the context of attempting to find keys used in encryption. But given modern computing power, 64-bit strength may not be sufficient. Sixty-four-bit strength would require 2 64 attempts to process every possible combination of characters making up the password. For instance, a five-word string password generated by the Diceware method would have 64 bit encryption strength, the same as a password of seven randomly generated case-sensitive alpha-numeric characters. One solution is to use the Diceware method to produce a string of randomly selected words, which is easier to remember. The problem is that few passwords are randomly generated because they are hard to remember and often have to be written down.Microsoft, Create Strong Passwords (Recommends stringing phrases together).If you don’t, most users willĬhoose passwords from a very small subset of the total ![]() ![]() Instruct users toĬhoose passwords containing numbers and special charactersĪs well as letters. Which might further encourage the use of mnemonics. To choose passwords with 10 or more characters, Which are as memorable as naively selected passwordsīut as hard to guess as randomly chosen passwords.
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