December 2010
Intermediate to advanced
363 pages
12h 21m
English
book
Pro PHP Security: From Application Security Principles to the Implementation of XSS Defenses, Second Edition
by Chris Snyder, Michael Southwell, Thomas Myer
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Recommended Hash Functions
Because hashing is irreversible, it can't be used to store or transfer information. But it is an excellent method of error detection, in which case it can reveal whether a chunk of data is or is not what was expected. If, as in the case of passwords, the content of the data is in fact less important than its integrity, such functions are very useful.
MD5
The Message Digest (MD) algorithm, developed by the same Ron Rivest who was a key player in the creation of RSA encryption, was defined in 1992 in RFC 1321 (available at http://www.ietf.org/rfc/rfc1321.txt) as a means to calculate a 128-bit digest of any message of arbitrary length. It was designed to be extremely fast computationally, as indeed it is. Currently version ...