2D Sine Logistic modulation map for image encryption

A symmetric image encryption algorithm based on mixed linear–nonlinear coupled map lattice

Image encryption using 2D Logistic-adjusted-Sine map

Recently, many authentication protocols have been presented using smartcard for the telecare medicine information system (TMIS). In 2014, Xu et al. put forward a two-factor mutual authentication with key agreement protocol using elliptic curve cryptography (ECC). However, the authors have proved that the protocol is not appropriate for practical use as it has many problems (1) it fails to achieve strong authentication in login and authentication phases; (2) it fails to update the password correctly in the password change phase; (3) it fails to provide the revocation of lost/stolen smartcard; and (4) it fails to protect the strong replay attack. We then devised an anonymous and provably secure two-factor authentication protocol based on ECC. Our protocol is analyzed with the random oracle model and demonstrated to be formally secured against the hardness assumption of computational Diffie-Hellman problem. The performance evaluation demonstrated that our protocol outperforms from the perspective of security, functionality and computation costs over other existing designs.

Cryptanalysis and Improvement of Authentication and Key Agreement Protocols for Telecare Medicine Information Systems

Pseudorandom binary sequences play a significant role in many fields, such as error control coding, spread spectrum communications, and cryptography. In recent years, chaotic system is regarded as an important pseudorandom source in the design of pseudorandom bit generators (PRBGs). Among them, most are based on one or more fixed chaotic systems, and the generated binary sequences come to be stationary. However, these kinds of chaotic PRBGs can be attacked by reconstructing the phase space or using some statistical analysis methods. In this study, a scheme for chaotic PRBG based on non-stationary logistic map is proposed. The authors design a dynamic algorithm to change the driven parameter sequence (not random) into a random-like sequence. The variable parameters disrupt the phase space of the system, which can resist the phase space reconstruction attacks effectively. They prove that the non-stationary logistic map is still chaotic under Wiggins' chaos definition. The numerical analysis shows that the generated binary sequences have good cryptographic properties and can pass the well-known statistical tests. The authors' chaotic PRBG based on non-stationary logistic map is a novel scheme in the design of PRBG, and is more secure than the PRBGs based on fixed chaotic systems.

Pseudorandom bit generator based on non-stationary logistic maps

In recent years, intelligent railway operation and maintenance using cloud technology have received wide consideration for the provision of public transport services. Under the cloud environment, information security is critical to ensure the integrity of data through protection from unauthorized manipulation and the confidentiality through protection against the leakage of sensitive information. This paper proposes a lightweight authenticated encryption scheme with associated data based on a novel discrete chaotic S-box coupled map lattice (SCML), which avoids the dynamic degradation of the digital chaotic system and low efficiency of the chaos-based cryptosystem. Based on the chaotic SCML, an authenticated encryption scheme that protects the confidentiality and integrity in one pass is presented in detail. The security analysis and performance simulations in software and hardware show that the proposed scheme is efficient and provides adequate security through authentication and encryption. Such a scheme could be used for applications in a railway cloud service that requires moderate security and low-cost implementations.

A Lightweight Authenticated Encryption Scheme Based on Chaotic SCML for Railway Cloud Service

Secure chaotic system with application to chaotic ciphers

This paper analyzes the security of a chaotic parallel keyed hash function in detail, and points out that it is susceptible to two kinds of forgery attacks and weak key attack (which results in MAC collision). To remedy such security flaws, an improved scheme is further proposed, and its security and performance are also discussed. The theoretical analysis shows that the improved scheme is more secure than the original one. In the meanwhile, it can also keep the parallel merit and other performance advantages of the original scheme.

Wei Guo

Papers

A Lightweight Authenticated Encryption Scheme Based on Chaotic SCML for Railway Cloud Service

Secure chaotic system with application to chaotic ciphers

Cryptanalysis and improvement on a parallel keyed hash function based on chaotic neural network