Digital Certificate Operation in a Complex Environment
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Message digest AKA thumbprint or hash Distillation of the information contained in a file [or message] into a single large number, typically between 128 and 256 bits in length. If any part of the file is changed, it should be computationally unfeasible to find another file with the same message digest value. Also called one-way hash functions because they produce values that are difficult to invert, resistant to attack, effectively unique, and widely distributed. See also hash.
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