June 2004
Intermediate to advanced
840 pages
39h 47m
English
Content preview from The Internet and Its Protocols
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710 Chapter 14 Concepts in IP Security
DES uses a minimum 64-bit key of which 56 bits are available to define the
key itself, and 8 bits (one per byte) are used to provide error detection on the
key itself. The eighth bit in each byte is set to give parity in the byte--that is, it
is set so that there are an even number of bits set to 1 within the byte.
Four modes of DES operation are defined, each providing an increased level
of complexity and, thus, a better level of security. The Electronic Codebook
(ECB) mode is the direct application of the DES algorithm to encrypt and decrypt
data, deriving its name ...
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