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  • 1.
    Dubrova, Elena
    et al.
    KTH, School of Information and Communication Technology (ICT), Electronics and Embedded Systems.
    Hell, Martin
    Lund University, Sweden.
    Espresso: A stream cipher for 5G wireless communication systems2017In: Cryptography and Communications, ISSN 1936-2447, E-ISSN 1936-2455, Vol. 9, no 2, p. 273-289Article in journal (Refereed)
    Abstract [en]

    The demand for more efficient ciphers is a likely to sharpen with new generation of products and applications. Previous cipher designs typically focused on optimizing only one of the two parameters - hardware size or speed, for a given security level. In this paper, we present a methodology for designing a class of stream ciphers which takes into account both parameters simultaneously. We combine the advantage of the Galois configuration of NLFSRs, short propagation delay, with the advantage of the Fibonacci configuration of NLFSRs, which can be analyzed formally. According to our analysis, the presented stream cipher Espresso is the fastest among the ciphers below 1500 GE, including Grain-128 and Trivium.

  • 2.
    Dubrova, Elena
    et al.
    KTH, School of Electrical Engineering and Computer Science (EECS), Electronics.
    Naslund, Mats
    Ericsson AB, Ericsson Res, Stockholm, Sweden..
    Selander, Göran
    Ericsson AB, Ericsson Res, Stockholm, Sweden..
    Lindqvist, Fredrik
    Ericsson AB, Ericsson Res, Stockholm, Sweden..
    Message authentication based on cryptographically secure CRC without polynomial irreducibility test2018In: Cryptography and Communications, ISSN 1936-2447, E-ISSN 1936-2455, Vol. 10, no 2, p. 383-399Article in journal (Refereed)
    Abstract [en]

    In this paper, we present a message authentication scheme based on cryptographically secure cyclic redundancy check (CRC). Similarly to previously proposed cryptographically secure CRCs, the presented one detects both random and malicious errors without increasing bandwidth. The main difference from previous approaches is that we use random instead of irreducible generator polynomials. This eliminates the need for irreducibility tests. We provide a detailed quantitative analysis of the achieved security as a function of message and CRC sizes. The results show that the presented scheme is particularly suitable for the authentication of short messages.

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