A novel stream cipher based on quasigroups and QG-PRNG Online publication date: Tue, 09-Jan-2024
by Umesh Kumar; V.C. Venkaiah
International Journal of Information and Computer Security (IJICS), Vol. 22, No. 3/4, 2023
Abstract: Stream ciphers that use the XOR-function are vulnerable to known-plaintext and reused-key attacks. To overcome such shortcomings of the existing ciphers, we hereby propose a novel stream cipher based on a quasigroup and a pseudo-random number generator (QG-PRNG). The QG-PRNG is also defined in this paper. Novelty of the proposed cipher is that a keystream once generated can be reused multiple times. The proposed cipher is analysed against various attacks, including reused-key, chosen-ciphertext, chosen-plaintext, and known-plaintext attacks and was found it to be resistant to these attacks. The proposed cipher and QG-PRNG are implemented in C++, and the performance of the proposed cipher is compared with some existing quasigroup-based stream ciphers, finding that the proposed cipher is more efficient than the existing proposals. We also evaluated both the QG-PRNG and the proposed cipher using various statistical tests of the NIST-STS, and we found that both the schemes pass these tests.
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