BLOCKCHAIN-ASSISTED HASH-BASED DATA SIGNATURE SYSTEM AND METHOD

摘要

A set of secret, indexed keys (z₁; ... ; z_N) is generated and used in requests from a signing entity (D) to a signing server (S) for digital signature of messages (m). The signing server maintains a counter (i) as well as a hash tree (220) that aggregates requests during a round into a root value (r_t) that is stored in an append-only data structure (330) in a repository (R). Each signing entity is associated with a leaf (l_i) of the hash tree. After a signature is formed, the counter for the requesting signing entity is incremented, whereby the secret key (z_t) that was used cannot be used again.