'Addition modulo' diaporamas de présentation

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Binary Operations

Binary Operations. Let S be any given set. A binary operation ? on S is a correspondence that associates with each ordered pair (a, b) of elements of S a uniquely determined element a ? b = c where c ? S. Discussion. Can you determine some other binary operations on the whole numbers?

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Numerical Methods for Partial Differential Equations

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SHA and HMAC

SHA and HMAC. By: Matthew Ng. What is SHA. SHA stands for Secure Hash Algorithm It is based off the Merkle-Dangard hash function There are 3 versions of it with one coming in 2012 SHA-0 SHA-1 SHA-2 SHA-3 (coming soon) SHA-1 and SHA-2 were designed by the National Security Agency (NSA).

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Multiplicative Group

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