Hi,

>BTW what is the difference between an encryption algorithm and a
digesting
>one?

See http://www.webopedia.com/TERM/M/message_digest.html for a good
definition of the relationship.

Specifically for MD5:

MD5 was developed by Professor Ronald L. Rivest of MIT. What it does, to
quote the executive summary of rfc1321, is:
[The MD5 algorithm] takes as input a message of arbitrary length and
produces as output a 128-bit "fingerprint" or "message digest" of the
input. It is conjectured that it is computationally infeasible to
produce two messages having the same message digest, or to produce any
message having a given prespecified target message digest. The MD5
algorithm is intended for digital signature applications, where a large
file must be "compressed" in a secure manner before being encrypted with
a private (secret) key under a public-key cryptosystem such as RSA.
In essence, MD5 is a way to verify data integrity, and is much more
reliable than checksum and many other commonly used methods.

Yoav Shapira



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