Symmetric Key

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Symmetric-key algorithm - Symmetric-key algorithms are a class of algorithms for cryptography that use trivially related cryptographic keys for both decryption and encryption.

Diffie-Hellman key exchange - Diffie-Hellman key exchange is a cryptographic protocol which allows two parties that have no prior knowledge of each other to jointly establish a shared secret key over an insecure communications channel. This key can then be used to encrypt subsequent communications using a symmetric key cipher.

Elliptic Curve Diffie-Hellman - Elliptic Curve Diffie-Hellman (ECDH) is a key agreement protocol that allows two parties to estabilish a shared secret key over an insecure channel. This key can then be used to encrypt subsequent communications using a symmetric key cipher.

40-bit encryption - 40-bit encryption is a key size for symmetric encryption representing where the key is forty bits in length (five bytes); this represents a relatively low level of security. Forty bits can represent a total of 2^{40} possible keys.


Suggested Web Sites

RSA Security's Official Guide to Cryptography - Burnett and Paine. Explains the differences between symmetric-key and public-key cryptography, how PKI and X.509 affect security and how the RSA algorithm works within protocols.

Snapcrypt - Cryptography Algorithms - A library for the TMS320C54x DSP, contains algorithms for symmetric block ciphers, one-way hash functions, public key encryption and digital signature.

Davis, Don - Research in symmetric and public-key hybrid protocols, links to publications, and contact information.

Source: BazSites.com


Web Links

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Key to Success - ... effectively raised to 128-bit key lengths in 1999/2000. Symmetric algorithm key lengths When the Data Encryption Standard cipher was ...

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