SIGNING METHOD DELIVERING A PARTIAL SIGNATURE ASSOCIATED WITH A MESSAGE, THRESHOLD SIGNING METHOD, SIGNATURE VERIFICATION METHOD, AND CORRESPONDING COMPUTER PROGRAM AND ELECTRONIC DEVICES

摘要

In one embodiment, it is proposed a signing method delivering a partial signature associated with a message, said partial signature being used in a threshold signing method, the signing method being executed on an electronic device. Such signing method is remarkable in that it comprises signing a hash of said message with a one-time linearly homomorphic structure preserving signature method with a partial secret key, said partial secret key being obtained from an output of a secret sharing scheme, and said signing delivering said partial signature associated with said message.