Thomson Licensing

Benoit Libert

Marc Joye

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.

Signing method delivering a partial signature associated with a message, threshold signing method, signature verification method, and corresponding computer program and electronic devices

A threshold encryption system comprising a sender device configured to generate ciphertexts and at least one entity device configured to perform partial decryption of ciphertexts. The system is based on Cramer-Shoup encryption systems and use linearly homomorphic signatures as publicly verifiable proofs of ciphertext validity.

Threshold encryption using homomorphic signatures

In one embodiment, it is proposed a method for ciphering a plaintext M belonging to a groupof prime order p, such method being performed by an electronic device. The method is remarkable in that it comprises:

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Lyons, France

Benoit Libert