Probabilistic encryption

Algorithm

Pixel

Discrete mathematics

Deterministic encryption

Theoretical computer science

Encryption

Computer science

Acoustics

Public-key cryptography

Computer network

Physics

Symmetric-key algorithm

Mathematics

Watermarking attack

Plaintext

Symmetric group

Permutation (music)

Ciphertext

Random permutation

Computer vision

Entropy

Recently, a variety of chaos-based image encryption algorithms adopting the traditional permutation-diffusion structure have been suggested. Most of these algorithms cannot resist the powerful chosen-plaintext attack and chosen-ciphertext attack efficiently for less sensitivity to plain-image. This paper presents a symmetric color image encryption system based on plaintext-related random access bit-permutation mechanism (PRRABPM). In the proposed scheme, a new random access bit-permutation mechanism is used to shuffle 3D bit matrix transformed from an original color image, making the RGB components of the color image interact with each other. Furthermore, the key streams used in random access bit-permutation mechanism operation are extremely dependent on plain image in an ingenious way. Therefore, the encryption system is sensitive to tiny differences in key and original images, which means that it can efficiently resist chosen-plaintext attack and chosen-ciphertext attack. In the diffusion stage, the previous encrypted pixel is used to encrypt the current pixel. The simulation results show that even though the permutation-diffusion operation in our encryption scheme is performed only one time, the proposed algorithm has favorable security performance. Considering real-time applications, the encryption speed can be further improved.

A Symmetric Plaintext-Related Color Image Encryption System Based on Bit Permutation