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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.
The primary purpose of wall padding is to provide a safe level of absorption for an individual making impact with an established object. Often these objects are walls (hence “wall padding”), but also these pads commonly protect bleachers, stage fronts, I-Beams, goal posts, columns, and fences.