![]() Thus, we're confident that a 12-character passwordįor cases where an attacker might have prolonged access to a password Further, an attacker should not have a chance to attack a remote serverįor such a long time. Some purpose-built systems can crack passwords at a much higher rate, butĮven if processing at 10x or 100x the rate, it will take a long time toĬrack. Passwords at a rate of 350 billion per second.Īt that rate, a 12-character made up of letters and numbersĬould be cracked in 3.23x10^21 passwords / 3.5x10^11 passwords/second /ģ.154x10^7 seconds/year = 292.3 years to crack. ![]() In 2012, there were claims that one commercial product could crack With 12-character passwords made up of letters and numbers, it wouldģ.23x10^21 passwords / 2.8x10^9 passwords/second / Generate 2,800,000,000 passwords per second (source: If you feel the password strength should be stronger, then byĪll means create longer one using the above tools (or concatenating twoĪs of 2011, there are commercial products that claim to be able to To achieve that, one would need at least 43Ĭharacters in the password, yielding 43*log2(62) ~= 256 bits of Justįor good measure, we recommend using passwords that provide 384īits of protection. This means that passwords should also be at least 256 bits long. AES Crypt uses aĢ56-bit encryption key, but uses a password to secure that key. Period of years with many computers in parallel. Software will produce files that might be attacked off-line over a Password strength is more important than for the typical web site. ![]() We refer to the bit length of the password. By now, it should be clear that when we refer to the length, Thing, as we have said before, it the length and randomness of the A computer will simply work through the combinations ofĬharacters, no matter what those characters might be. Computers do not care how easy a password is for With 16 characters comprised of letters and numbers, we get a total of 95.27 bits of strenth, providing for 2^95.27 or (4.77 x 10^28) possible values.Īnother important point is that we should never worry that a password isĮasier for humans. Letters and numberswould provide 83.35 bits of strength. A 14-character password comprised of only If you wish to have the extra strength, use aġ4-character password. What is the benefit? With special characters, there is a total strength ofħ8.47 bits, versus 71.45 bits with the friendlier password. Using 93 different characters providesĪbout 6.54 bits of strength per character (log2(93)). Pool of 93 different characters that use special characters (e.g., $, !, If you prefer a slightly stronger password, you could generate one from a Values a hacker must inspect in order to crack the password. That means there are about 2^71.45 (or 3.23x10^21) possible Twelve such characters will yield 71.45 bits of This means each character provides about 5.95 bits of Possible values, including numbers, uppercase letters, and lowercase The reason we do not recommend use of special characters is that specialĬharacters like '&' add very little to the strength of the password,īut make it more difficult for humans to use. Passwords using special characters if requested we just do not do that by Note: the password generator software referenced above will generate Randomness of the password determines its strength. It is fair to ask if such passwords are strongĮnough for various applications. Further, we recommend use of thoseĬharacters to make it easier for humans to use. Knowing both values, it would be impossible to generate the "Serviceīy default, Packetizer's Secure Password Generator generates passwords using That for extra security, it is possible to use a random passwordįor both the "Single Pass Password" and the "Service Name". To create very cryptic passwords using a single master password. It is always a good idea to use different passwords for different web sites Secure password generator software (Perl script, C source code for Linux and Windows, and Windows executable).Much of the details found on the page below might not be of interest ![]() The secret to a good password is randomness and length. Such requirements actuallyĭo not lend significantly to the strength of a password, as you'll seeīelow. You will find that some web sites will demand the use of specialĬharacters, including !, %, $, and so forth. The question many people ask is, "What is a strong password?" Generating a strong, secure password is critical to protect yourīank accounts or other online accounts, and for use with software like ![]()
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