Method for generating a message signature from a signature token encrypted by means of a homomorphic encryption function
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United States of America Patent
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Jun 18, 2019
Grant Date -
Nov 24, 2016
app pub date -
May 2, 2016
filing date -
May 6, 2015
priority date (Note) -
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status (Latency Note)
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Abstract
A method for generating a message signature intended to be validated by a verifier server. A client device is configured to hold a private key and a corresponding public key. The method includes offline pre-computation by a hardware security module of a signature token, a result of encryption using a homomorphic encryption function, storage of the signature token generation of the signature of the encrypted message by the homomorphic encryption function from the result of the encryption by the homomorphic encryption function of the private key stored by the client device, of the signature token and of the message. The signature is intended to be validated by the verifier server by the public key.
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