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SIDH Hybrid Schemes with Classical Component Based on the Discrete Logarithm Problem over Finite Field Extension

Wroński Michał, Burek Elżbieta, Dzierzkowski Łukasz

International Journal of Electronics and Telecommunications

2020

Vol. 66, No. 3

431--441

The concept of a hybrid scheme with connection of SIDH and ECDH is nowadays very popular. In hardware implementations it is convenient to use a classical key exchange algorithm, which is based on the same finite field as SIDH. Most frequently used hybrid scheme is SIDH-ECDH. On the other hand, using the same field as in SIDH, one can construct schemes over Fpn, like Diffie-Hellman or XTR scheme, whose security is based on the discrete logarithm problem. In this paper, idea of such schemes will be presented. The security of schemes, which are based on the discrete logarithm problem over fields Fp; Fp2 ; Fp4 ; Fp6 and Fp8 , for primes p used in SIDH, will be analyzed. At the end, the propositions of practical applications of these schemes will be presented.

Hybrid Encryption from McEliece Cryptosystem with Pseudo-random Error Vector

Zajac Pavol

Fundamenta Informaticae

2019

Vol. 169, nr 4

345--360

We propose a new hybrid encryption scheme to use with McEliece cryptosystem. The hybrid scheme uses specific authenticated encryption scheme for the encryption of the plaintext. The symmetric key is embedded in reversible way into the error vector of the McEliece cryptosystem. CCA2 security is provided by the symmetric part of the scheme. The embedding is done in such a way, that the error vector cannot be distinguished from a randomly chosen one. An eXtensible Output Function can be used to enable variable length conversion from (pseudo-random) bit strings to error vectors. The encryption part can be implemented in a streamed way, so the sender does not have to store the whole message in the memory.