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The Bulletin of the Polish Academy of Sciences: Technical Sciences is published bimonthly by the Division IV Engineering Sciences of the Polish Academy of Sciences, since the beginning of the existence of the PAS in 1952. The journal is peer‐reviewed and is published both in printed and electronic form. It is established for the publication of original high quality papers from multidisciplinary Engineering sciences with the following topics preferred: Artificial and Computational Intelligence, Biomedical Engineering and Biotechnology, Civil Engineering, Control, Informatics and Robotics, Electronics, Telecommunication and Optoelectronics, Mechanical and Aeronautical Engineering, Thermodynamics, Material Science and Nanotechnology, Power Systems and Power Electronics. Journal Metrics: JCR Impact Factor 2018: 1.361, 5 Year Impact Factor: 1.323, SCImago Journal Rank (SJR) 2017: 0.319, Source Normalized Impact per Paper (SNIP) 2017: 1.005, CiteScore 2017: 1.27, The Polish Ministry of Science and Higher Education 2017: 25 points. Abbreviations/Acronym: Journal citation: Bull. Pol. Ac.: Tech., ISO: Bull. Pol. Acad. Sci.-Tech. Sci., JCR Abbrev: B POL ACAD SCI-TECH Acronym in the Editorial System: BPASTS., In this study, we propose a novel keyed hash algorithm based on a Boolean function and chaotic attractor. The hash algorithm called BentSign is based on two Signature attractors and XOR function and a bent Boolean function. The provided theoretical and experimental results confirm that the novel scheme can generate output hashes with a good level of security, collision resistance, and protection against most common attacks.

Conference of 2nd International Conference on Frontiers of Signal Processing, ICFSP 2016 ; Conference Date: 15 October 2016 Through 17 October 2016; Conference Code:125724; International audience; Goldreich-Goldwasser-Halevi (GGH) is a lattice-based public-key cryptosystem which has been widely developed due to its simple encryption and decryption procedures. Despite many existing GGH improvements, its huge public key size remains its main drawback, which prevents the system from being used in practice. In order to reduce the key size, we propose in this paper a new GGH cryptosystem using Generalized low density (GLD) lattices. For this proposed GGH lattice-based scheme, we provide a security analysis by considering all known attacks on GGH systems. We conclude that our scheme is as secure as the existing GGH schemes. We also investigate the complexity of our cryptosystem and prove that GLD lattices reduce significantly the key size and the complexity of the key generation and decryption phases compared to other GGH systems.