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2. Symmetric-key algorithms


Aproach

Symmetric-key algorithms are a class of algorithms for cryptography that use trivially related, often identical, cryptographic keys for both decryption and encryption etc.[1]
The keys, in practice, represent a shared secret between two or more parties that can be used to maintain a private information link. Other terms for symmetric-key encryption are secret-key, single-key, shared-key, one-key, and private-key encryption.[1]

[2]

Reference

[1] http://en.wikipedia.org/wiki/Symmetric-key_algorithm
[2] http://download.oracle.com/docs/cd/E19424-01/820-4811/gbesy/index.html

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