Padding (cryptography)
Adding data to a message prior to encryption to hide its length / From Wikipedia, the free encyclopedia
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In cryptography, padding is any of a number of distinct practices which all include adding data to the beginning, middle, or end of a message prior to encryption. In classical cryptography, padding may include adding nonsense phrases to a message to obscure the fact that many messages end in predictable ways, e.g. sincerely yours.
Adding data to a message prior to encryption to hide its length