Hashing is used to protect the integrity of the message. It is essentially a one-way algorithm that is capable of creating a fixed-length extract of the message (or document). This extract (hash) is:
specific to the given document,
changing even a single bit in the document changes the hash,
it is not possible to predict how a certain change in the document modifies the hash (that is, it is impossible to predict the hash),
it is not possible to recover the original document from the hash.
Published on May 30, 2024
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