Triple DES (3DES)

A private key cryptosystem published by the National Institutes of Standards and Technology (NIST). DES is a symmetric block cipher with a block length of 64 bits and an effective key length of 56 bits. DES has been used commonly for data encryption in the forms of software and hardware implementation. A standard cryptosystem proposed in 1977 for all government communications. DES and 3DES were superseded by Advanced Encryption Standard (AES) in December 2001. Cryptographic algorithm, designed for the protection of unclassified data and published by the National Institute of Standards and Technology (NIST) in Federal Information Processing Standard (FIPS) Publication 46. (FIPS 463 withdrawn 19 May 2005) (. See Triple DES) and CNSS Advisory IA/0204 Revised March 2005)
[view]

Product cipher that, like DES, operates on 64bit data blocks. There are several forms, each of which uses the DES cipher 3 times. Some forms use two 56bit keys, some use three. (. See NIST FIPS 463 and CNSSAM IA/0204)
[view]

A model of models. Because the spiral model encapsulates a number of iterations of another model (the waterfall model), it is known as a metamodel.
[view]

A form of cryptography that does not use symmetric keys. It either uses complex formulas to solve problems (such as Diffie-Hellman to generate/exchange symmetric keys) or uses key pair sets to provide digital signatures and digital envelopes. This latter form is also known as public key cryptography.
[view]

A randomlygenerated key that is used one time, and then discarded. Session keys are symmetric (used for both encryption and decryption). They are sent with the message, protected by encryption with a public key from the intended recipient. A session key consists of a random number of approximately 40 to 2000 bits. Session keys can be derived from hash values.
[view]