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conference paper not in proceedings

Cryptanalysis of Enhanced MORE

Vizár, Damian  
•
Vaudenay, Serge  
2018
Central European Conference on Cryptology

Fully homomorphic encryption (FHE) has been among the most popular research topics of the last decade. While the bootstrapping-based, public key cryptosystems that follow Gentry's original design are getting more and more efficient, their performance is still far from being practical. This lead to several attempts to construct symmetric FHE schemes that would not be as inefficient as their public key counterparts. Unfortunately, most such schemes were also based on (randomized) linear transformations, and shown completely insecure. One such broken scheme was the Matrix Operation for Randomization and Encryption (MORE). In a recent paper, Hariss, Noura and Samhat propose Enhanced MORE, which is supposed to improve over MORE's weaknesses. We analyze Enhanced MORE, discuss why it does not improve over MORE, and show that it is even less secure by presenting a highly efficient ciphertext-only decryption attack. We implement the attack and confirm its correctness.

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Type
conference paper not in proceedings
Author(s)
Vizár, Damian  
Vaudenay, Serge  
Date Issued

2018

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LASEC  
Event nameEvent placeEvent date
Central European Conference on Cryptology

Smolenice, Slovakia

June 6-8, 2018

Available on Infoscience
March 22, 2019
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/155694
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