Hybrid Encryption from McEliece Cryptosystem with Pseudo-random Error Vector
Pavol Zajac · Fundamenta Informaticae · 2019
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 prov ided 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.