公开(公告)号：EP4366232A1

公开(公告)日：2024-05-08

申请号：EP22306658.0

申请日：2022-11-03

申请人： CryptoNext SAS

发明人： Faugère, Jean-Charles ,  Adomnicai, Alexandre

IPC分类号： H04L9/30 ,  H04L9/32 ,  H04L9/00

CPC分类号： H04L9/3247 ,  H04L9/3093 ,  H04L9/003

摘要： The disclosure relates to a cryptographic device and to a method to improve the security of the cryptographic device while minimizing the deceleration of the cryptographic device due to improving the security of the cryptographic device. The cryptographic device comprises at least one electronic chip to carry out a Dilithium operation involving a vector y of polynomials yi with coefficients yi,j. The method comprises the cryptographic device generating the vector y from a random seed and unpacking the vector y from a bit string. The method further comprises the cryptographic device reusing the random seed to randomly shuffle the unpacking of the vector y, thereby further securing the Dilithium operation while sparing a random number generation.