Secure FSM- based arithmetic codes

TL;DR

This paper introduces a secure image compression method combining finite state arithmetic coding with Huffman codes, enhancing security through random jumps and output swapping, while maintaining high compression efficiency.

Contribution

It proposes a novel Huffman Finite State Arithmetic Coding (HFSAC) scheme that integrates security features into arithmetic coding for real-time image encryption.

Findings

High compression efficiency maintained

Enhanced security through random jumps and output swapping

Effective in real-time image encryption and transmission

Abstract

Recently, arithmetic coding has attracted the attention of many scholars because of its high compression capability. Accordingly, in this paper a method which adds secrecy to this well-known source code is proposed. Finite state arithmetic code (FSAC) is used as source code to add security. Its finite state machine (FSM) characteristic is exploited to insert some random jumps during source coding process. In addition, a Huffman code is designed for each state to make decoding possible even in jumps. Being Prefix free, Huffman codes are useful in tracking correct states for an authorized user when s/he decodes with correct symmetric pseudo random key. The robustness of our proposed scheme is further reinforced by adding another extra uncertainty by swapping outputs of Huffman codes in each state. Several test images are used for inspecting the validity of the proposed Huffman Finite State Arithmetic Coding (HFSAC). The results of several experimental, key space analyses, statistical analysis, key sensitivity and plaintext sensitivity tests show that HFSAC with a little effect on compression efficiency for image cryptosystem provides an efficient and secure way for real-time image encryption and transmission.