Alt N. A Tiny Bit Of Near-random Data Inserted Where Too Much Regularity Would Be Undesirable

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salt n.

A tiny bit of near-random data inserted where too
much regularity would be undesirable; a data frob (sense 1).
For example, the Unix crypt(3) man page mentions that "the salt
string is used to perturb the DES algorithm in one of 4096
different ways."

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