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What is symmetric cryptography?

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What is symmetric cryptography?

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Encryption uses a mathematical key to provide secrecy. Symmetric cryptography refers to encryption systems that use the same key to encrypt and decrypt. A longer explanation can be found here: http://www.webopedia.com/TERM/S/symmetric_key_cryptography.htm There are many books that explain these concepts in more detail. We recommend Chapter XX of Secrets & Lies: Digital Security in a Networked World, by Bruce Schneier.

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