Production of cryptographic signatures

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 9755839
SERIAL NO

14742237

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Abstract

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A method and system configured to produce a cryptographic signature on a message, under a key, at a user computer wherein the key is shared between the user computer, which stores a first key-share, and an authentication computer, which stores a second key-share and a first authentication value. The user computer encodes the message to produce a blinded message, produces the first authentication value from a user password and a secret value, and produces a second authentication value by encoding the first authentication value and a nonce. The authentication computer uses the nonce to determine if the first authentication value is correct and, if so, encodes the blinded message using the second key-share to produce a partial signature. The user computer produces a signature on the message under the key by encoding the partial signature and the message using the first key-share and an unblinding function.

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Patent Owner(s)

  • INTERNATIONAL BUSINESS MACHINES CORPORATION

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Camenisch, Jan L Thalwil, CH 71 801
Lehmann, Anja Zurich, CH 43 462
Neven, Gregory Oberrieden, CH 49 615

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