公开(公告)号：EP4369234A1

公开(公告)日：2024-05-15

申请号：EP22206498.2

申请日：2022-11-09

申请人： Nagravision Sarl

发明人： MACCHETTI, Marco ,  SIMON, Clement ,  TONGIANI, Claudio ,  VILLEGAS, Karine

IPC分类号： G06F21/60 ,  H04L9/32 ,  H04L9/30

CPC分类号： H04L9/3247 ,  H04L9/3066 ,  G06F21/602

摘要： A public key (KpubEd) is generated (6, 60) from a private key (Kpriv) in elliptic curve cryptography, by getting a scalar multiplication (s.GEd) on a first elliptic curve of a twisted Edwards type, of a first base point (GEd) on that first elliptic curve by a scalar (s) derived from the private key. It is proceeded (603) with a scalar multiplication (s.GM) on a second elliptic curve of a Montgomery type birationally equivalent to the first elliptic curve via an isomorphism, of a second base point (GM) on the second elliptic curve corresponding to the first base point with respect to that isomorphism, by an adjusted scalar, and a resulting point is converted (604) to the scalar multiplication on the first elliptic curve by an isogeny. Signature generation and verification are exploiting similar principles.
Applications to authentication.