The AES algorithm uses substitution boxes, polynomial matrices, and symmetric key to convert a plain text to cipher text.
Amplified integers are grouped using various techniques, encrypted using a symmetric key to convert plain text into cipher text and finally stored in the output file in form of American Standard Code for Information Interchange ASCIII) characters.
Table 1 (a f) are cipher text blocks, cipher text sub-blocks, Brain disease cover image blocks, assignment of random number to cover image blocks, cover image block into bits and diagonal queues, respectively Suppose we have the following data a.
An example of the embedding procedure is shown in Table 1: Table 1 (a), (b), (c), (d), and (e) are cipher text blocks, cipher text sub-blocks, Brain disease cover image blocks, cover image block into bits, and diagonal queues respectively 1. Suppose we have the following data a.
4 sub-blocks of each N block of cipher text: 1 × 4 (b) Cipher text sub-blocks Open image in new window c.
It is based on unicity distance, a concept pioneered by Shannon [43] in 1949, which states that the amount of uncertainty in an encryption key reduces with each observed clear-text and cipher-text pair.
Given a plaintext, the DFA attack derived information about the secret key by examining the differences between a related cipher text resulting from a correct encryption and a cipher text of the same plaintext resulting from a faulty encryption.
This is achieved by having multiple possible cipher texts for each plain text and choosing randomly between these.
The first faulty cipher text determined eight candidates for S-box input, and the second faulty cipher text determined four candidates for S-box input.
Algorithm 1 arranges the faulty cipher texts and correct the cipher text in 16 groups of difference outputs of last round's S-box layer, i.e., ΔB 31 N j for 1 ≤ j ≤ 16.
The public-key cryptosystem Paillier [23] is additively homomorphic, meaning that multiplication of two cipher texts results in a new cipher text whose decryption equals the sum of the two plain texts.
