US 2026/0074916 A1Published application

Systems and methods for presignature and signature generation

AssigneeDfns US Inc

InventorsJonathan KATZ, Antoine URBAN

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Abstract

Some embodiments are directed to a system and methods for presignature and signature generation, the system comprising a plurality of signing devices and a coordinating system. Each signing device stores a share of each of multiple private keys, and is configured to compute one or more presignatures, independent of the multiple private keys; locally store the one or more presignatures; upon receiving from the coordinating system a selection for a private key, generate a share of a signature for a message, using a presignature out of the one or more presignatures computed and stored in the presigning phase; and to send the generated share of the signature for the message to the coordinating system. The coordinating system is configured to send the selection for a private key to one or more of the signing devices, and combine the generated shares of the signature for the message into a signature.

Claims22

Dependent claims

A system (100) for presignature and signature generation, the system (100) comprising a plurality of signing devices (110) and a coordinating system (120), wherein each of the plurality of signing devices (110) stores a share (141) of each of multiple private keys, wherein

each of the plurality of signing devices (110) comprises one or more processors (111) and one or more storage devices (112) storing instructions that, when executed by the one or more processors (111), cause the one or more processors (111) to perform operations for
in a presigning phase (210),
computing (201) one or more presignatures (115), independent of the multiple private keys, and
locally storing (204) the one or more presignatures (115),
and
in a signing phase (220), upon receiving from the coordinating system (120) a selection (125) for a private key out of the multiple private keys,
generating (206) a share (116, 116.1, 116.2, 116.3) of a signature (117) for a message (124), using a presignature (115) out of the one or more presignatures (115) computed (201) and stored (204) in the presigning phase (210), and
sending (207) the generated share (116, 116.1, 116.2, 116.3) of the signature (117) for the message (124) to the coordinating system (120), and
the coordinating system (120) comprises one or more processors (121) and one or more storage devices (122) storing instructions that, when executed by the one or more processors (121), cause the one or more processors (121) to perform operations for
sending (205) the selection (125) for a private key to one or more of the signing devices (110),
upon receiving the generated shares (116, 116.1, 116.2, 116.3) of the signature (117) for a message (124) from one or more of the signing devices (110), combining (208) the generated shares (116, 116.1, 116.2, 116.3) of the signature (117) for the message (124) into a signature (117).

8 more elements

Dependencies are inferred from the claim text.

Facts

Application: 18/827,334Filed 6 Sep 2024
Published: 12 Mar 2026
Term ends: Not estimatedThe source records don’t support an estimate.

Classification8 codes

H04L 9/085
Key establishment, i.e. cryptographic processes or cryptographic protocols whereby a shared secret becomes available to two or more parties, for…:…
H04L 9/3252
Involving digital signatures: using DSA or related signature schemes, e.g. elliptic based signatures, ElGamal or Schnorr schemes
H04L 9/14
Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols: using a plurality of keys…
H04L 9/3255
Involving digital signatures: using group based signatures, e.g. ring or threshold signatures

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