# Security Analysis of a Color Image Encryption Scheme Based on Dynamic Substitution and Diffusion Operations

### George Teşeleanu, George Teşeleanu

#### 2023

#### Abstract

In 2019, Essaid et al. proposed an encryption scheme for color images based on chaotic maps. Their solution uses two enhanced chaotic maps to dynamically generate the secret substitution boxes and the key bytes used by the cryptosystem. Note that both types of parameters are dependent on the size of the original image. The authors claim that their proposal provides enough security for transmitting color images over unsecured channels. Unfortunately, this is not the case. In this paper, we introduce two cryptanalytic attacks for Essaid et al.’s encryption scheme. The first one is a chosen plaintext attack, which for a given size, requires 256 chosen plaintexts to allow an attacker to decrypt any image of this size. The second attack is a a chosen ciphertext attack, which compared to the first one, requires 512 chosen ciphertexts to break the scheme for a given size. These attacks are possible because the generated substitution boxes and key bits remain unchanged for different plaintext images.

Download#### Paper Citation

#### in Harvard Style

Teşeleanu G. (2023). **Security Analysis of a Color Image Encryption Scheme Based on Dynamic Substitution and Diffusion Operations**. In *Proceedings of the 9th International Conference on Information Systems Security and Privacy - Volume 1: ICISSP,* ISBN 978-989-758-624-8, pages 410-417. DOI: 10.5220/0011646300003405

#### in Bibtex Style

@conference{icissp23,

author={George Teşeleanu},

title={Security Analysis of a Color Image Encryption Scheme Based on Dynamic Substitution and Diffusion Operations},

booktitle={Proceedings of the 9th International Conference on Information Systems Security and Privacy - Volume 1: ICISSP,},

year={2023},

pages={410-417},

publisher={SciTePress},

organization={INSTICC},

doi={10.5220/0011646300003405},

isbn={978-989-758-624-8},

}

#### in EndNote Style

TY - CONF

JO - Proceedings of the 9th International Conference on Information Systems Security and Privacy - Volume 1: ICISSP,

TI - Security Analysis of a Color Image Encryption Scheme Based on Dynamic Substitution and Diffusion Operations

SN - 978-989-758-624-8

AU - Teşeleanu G.

PY - 2023

SP - 410

EP - 417

DO - 10.5220/0011646300003405