On the security of a new image encryption scheme based on chaotic map lattices

TL;DR

This paper critically analyzes a chaotic map-based image encryption scheme, revealing vulnerabilities such as key space reduction and timing attacks, demonstrating it does not meet secure communication standards.

Contribution

It provides a detailed cryptanalysis exposing security flaws and suggests improvements for the chaotic map-based encryption scheme.

Findings

Key space can be significantly reduced via ciphertext-only attack

Timing attack can estimate parts of the key

The cryptosystem fails to meet security requirements

Abstract

This paper reports a detailed cryptanalysis of a recently proposed encryption scheme based on the logistic map. Some problems are emphasized concerning the key space definition and the implementation of the cryptosystem using floating-point operations. It is also shown how it is possible to reduce considerably the key space through a ciphertext-only attack. Moreover, a timing attack allows the estimation of part of the key due to the existent relationship between this part of the key and the encryption/decryption time. As a result, the main features of the cryptosystem do not satisfy the demands of secure communications. Some hints are offered to improve the cryptosystem under study according to those requirements.