Patent · US Active

Blockchain-assisted hash-based data signature system and method

US11057187B2 · kind B2 · utility

4Cited by

1References

7Claims

0Family size

Assignee

Guardtime SA · CH

Inventors

Ahto Buldas · Tallinn, EE
Risto Laanoja · Tallinn, EE
Ahto Truu · Tartu, EE

Key dates

Filing date	Aug 4, 2019
Grant date	Jul 6, 2021
Priority date	—
Expiry date	Mar 16, 2040

Classification

Technology area (CPC H)Electricity
CPC primaryH04L9/50
WIPO fieldDigital communication
WIPO sectorElectrical engineering

Abstract

A set of secret, indexed keys is generated and used in requests from a signing entity to a signing server for digital signature of messages. The signing server maintains a counter as well as a hash tree that aggregates requests during a round into a root value that is stored in an append-only data structure in a repository. Each signing entity is associated with a leaf of the hash tree. After a signature is formed, the counter for the requesting signing entity is incremented, whereby the secret key that was used cannot be used again.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.