Chaotic encryption algorithm based on alternant of stream cipher and block cipher

Abstract

In recent years, a growing number of discrete chaotic cryptographic algorithms have been proposed. However, most of them encounter some problems such as the lack of robustness and security. In this paper, a new encryption algorithm is proposed, which encrypts the plaintext based on alternant of the stream cipher and block cipher. A pseudo-random number is used to control which encryption mode is chosen. Using this algorithm, multiple kinds of files (such as TXT, DOC, WMA, and JPEG) are encrypted and decrypted, and the security of the proposed cryptosystem is analyzed. The results show that the security of the cryptosystem is intensified and the proposed algorithm can resist differential attacks.

Hardware stream cipher with controllable chaos generator for colour image encryption

“…The security performance of the proposed stream cipher is evaluated in Table 8 as compared with four recent chaos-based image encryption systems [18][19][20][21]. This comparison is based on the mean values of the correlation coefficients, entropy and differential analysis.…”

“…The work done by Huang [18] reports using Chebyshev function to generate the key stream to mask and permute image pixels in addition to two-dimentional Chebyshev function to avoid known-plaintext and chosen-plaintext attacks. Wang et al [19] also used three chaotic maps in his encryption that alters between block and stream ciphering. Liu and Wanga [20] utilised a true random number generator to provide the seed for a piecewise linear chaotic map which generates a key stream for image encryption.…”

Highly secured chaotic block cipher for fast image encryption

“…Wang et al proposed to combine the permutation and diffusion operations [21] and in thus doing so, obtained a higher encryption speed. Many other algorithms presenting both higher encryption speed and security level have been proposed [22][23][24][25][26][27][28][29][30].…”

A secure chaotic maps-based key agreement protocol without using smart cards

“…These features characterize excellent properties of diffusion and confusion, which are required by cryptography, especially secret key cryptosystems. The chaotic map has been used in the design of symmetric encryption protocols [2][3][4][5][6], S-boxes [7,8], and hash functions [9,10]. The key agreement protocol using a chaotic map also has been studied widely.…”