MD2 (Message Digest 2)

A number known as a message digest generated from a hash function. Also . See hash function. Producing hash values for accessing data or for security. A hash value (or simply hash), also called a message digest, is a number generated from a string of text. The hash is substantially smaller than the text itself, and is generated by a formula in such a way that it is extremely unlikely that some other text will produce the same hash value. Hashing is also a common method of accessing data records. To create an index, called a hash table, for these records, you would apply a formula to each name to produce a unique numeric value.
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A government standard hash function developed by the National Institute of Standards and Technology (NIST) and specified in an official government publication. SHA-1 creates a 160-bit hash value output. Members of the SHA-2 family create a range of hash value outputs: 224, 256, 384 or 512. SHA-3 was still in development at the time of this writing, but the Keccak algorithm has been selected for that emerging standard.
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A public key encryption algorithm named after Rivest, Shamir, and Adleman, its inventors.
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(1) A public key cryptosystem developed by Rivest, Shamir, and Adleman (RSA). The RSA has two different keys: the public encryption key and the secret decryption key. The strength of RSA depends on the difficulty of the prime number factorization. For applications with highlevel security, the number of the decryption key bits should be greater than 512 bits. RSA is used for both encryption and digital signatures. (2) Resource utilization, resource allocation. See Rivest, Shamir, and Adleman (RSA).
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The version of the MD algorithm released in 1991. MD5 processes 512-bit blocks of the message, using four distinct rounds of computation to produce a digest of the same length as the MD2 and MD4 algorithms (128 bits). Generally has been replaced by SHA-1 or other, more modern hashing algorithms.
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