NETWORK SECURITY
CONFIDENTIALITY
Question
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128 Bits


32 Bits


64 Bits


16 Bits

Detailed explanation1: DES is a block cipher that operates on data blocks of 64 bits in size. DES uses a 64bit key 8 × 8 including 1 bit for parity, so the actual key is 56 bits. DES, in common with other block ciphers, is based around a structure called a Feistel Lattice so it is useful to describe how this works.
Detailed explanation2: The DES keys are 64bit, 128bit, and 192bit keys that use the DES algorithm to perform the cryptographic function. A 64bit key is referred to as a singlelength key. A 128bit key is referred to as a doublelength key.
Detailed explanation3: The block size in DES is 64 bits. The cipher key size is 56 bits.
Detailed explanation4: DES uses a 64bit key, but because eight of those bits are used for parity checks, the effective key length is only 56 bits. The encryption algorithm generates 16 different 48bit subkeys, one for each of the 16 encryption rounds.