[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.
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