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

  • US 20150229480A1
  • Filed: 02/10/2015
  • Published: 08/13/2015
  • Est. Priority Date: 02/10/2014
  • Status: Active Grant
First Claim
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1. Signing method delivering a partial signature associated with a message M, said partial signature being used in a threshold signing method, the signing method being executed on an electronic device, and wherein it comprises signing a hash of said message M 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 M, and wherein said message M is a sequence of binary elements and said hash H(M) belongs to a Cartesian product custom-characterK+1, where custom-character is a group and K≧

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