 Block size = 8 bits  Hash size = 8 bits  Encryption function: Divide the key into two halves: LK and RK; Divide the plaintext into two halves: LT and RT; Then ciphertext= LC||RC where LC=LK XOR RT; and RC = RK XOR LT; where LC, RC, LT, and RT are each 4 bits; Plaintext and ciphertext are each 8 bits.  g(H) = an 8-bit string that is equal to the complement of bits in H; For example, if H=A3 (Hexa) = 10100011 (binary); then g(H)= 01011100  H0 = Initial hash = 11001010   Given a message m: CAB2 (in Hexa); Q1. Determine the hash (in hexadecimal) of the message M using Martyas-Meyer-Oseas hash function (Fig. 11.7). Q.2 Determine the hash (in hexadecimal) of the message M using Davis-Meyer hash function (Fig. 11.6) Q.3 Determine the hash (in hexadecimal) of the message M using Migayuchi-Preneel hash function (Fig. 11.6)

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Hash Table

A hash table also called a hash map, is a data structure that maps key-value pairs. The hash table can be used in complex systems to provide fast access and compact storage. A hash table is a structure that stores data in an abstract data type kind of associative array. It keeps data in an array format, with a distinct index value for every data value. If the index of the required data is known, then the data can be accessed very easily.