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Description of the cryptosystem HFE
 Jančaříková, Irena ; Žemlička, Jan (advisor) ; Příhoda, Pavel (referee)
This bachelor thesis deals with the description of the assymetric HFE cryptosystem. This thesis contains encryption and decryption using this cryptosystem, estimations of the time complexity of private and public transformation and the memory requirements to store secret and public keys. Thesis also contains a basic description of the predecessor HFE cryptosystem, cryptosystem C *. The work includes a short passage about MQ problem, which are cryptosystems based on and a short treatise on finite fields over which cryptosystems are both defined. The paper deals with the attack, which proves possibility of breaking C * for the majority of encrypted messages and contains a variant of this attack for HFE cryptosystem.
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