Key Iterations and Cryptographic Salts
by Adam Berent - Monday, 26 May 2003.
The following document discusses the use of key iterations and cryptographic salts to stop dictionary attacks in password based encryption (symmetric cryptography).

One of the most powerful attacks one can mount on encrypted data is a Dictionary Attack. A dictionary attack is a form of a brute force attack, which simply tries every single combination of a key against encrypted data. However, in most cases, this is not needed. User passphrases are unfortunately sometimes based on real words, dates, names, etc. We can eliminate most of the pass-phrase combinations by simply testing for most probable 30,000 words. An English dictionary is a good place to start, hence the term Dictionary Attack. This means that a key with a 128 bit key space, which has 3.4 x 1038 possible combinations, has just been reduced to just over 30,000 (somewhere between 11 and 12 bits). A computer that can process just 1 pass-phrase per second can run through the dictionary in just over 8 hours.

Download the paper in PDF format here.


Using Hollywood to improve your security program

Posted on 29 July 2014.  |  Tripwire CTO Dwayne Melancon spends a lot of time on airplanes, and ends up watching a lot of movies. Some of his favorite movies are adventures, spy stuff, and cunning heist movies. A lot of these movies provide great lessons that we can apply to information security.

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