Turning messages into numbers, however, is not the big idea. To be sure, the exact process by which all the information is digitized may be hidden from the general public, but nonetheless is not the source of protection from eavesdroppers. Indeed, from the point of view of cryptography, we may identify any message, the so-called plaintext, with the number that represents it and thereby think of that number as the plaintext itself, as it is assumed that anyone has access to the wherewithal that will allow one to be transformed into the other. Secrecy only comes on to the scene when we maskthese plaintext numbers with other numbers.
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