Common-Key Cryptosystem with Mixture of Fake Plaintexts
Masayoshi Hayashi, Hiroaki Higaki · Proceedings of the 2018 International Conference on Computer Science, Electronics and Communication Engineering (CSECE 2018) · 2018
One of the fundamental methods for eavesdroppers to achieve a plaintext from a cryptogram is the brute force attack where possible candidates of decryption keys are exhaustively applied to the decryption algorithm.Here the only reason why the eavesdroppers believe to find the common-key and to achieve the plaintext is that the output of the decryption algorithm is contextually acceptable.According to this fact, this paper proposes a novel common-key cryptosystem where fake plaintexts which are also contextually acceptable are mixed into a cryptogram with the legal plaintext.If an eavesdropper applies a fake common-key to the decryption algorithm, it outputs the fake plaintexts which the eavesdroppers might believe legal.This paper also proposes concrete encryption/decryption algorithm which can be combined with any conventional common-key cryptosystem.