초록 ▼

A multi-step signing system and method uses multiple signing devices to affix a single signature which can be verified using a single public verification key. Each signing device possesses a share of the signature key and affixes a partial signature in response to authorization from a plurality of a

A multi-step signing system and method uses multiple signing devices to affix a single signature which can be verified using a single public verification key. Each signing device possesses a share of the signature key and affixes a partial signature in response to authorization from a plurality of authorizing agents. In a serial embodiment, after a first partial signature has been affixed, a second signing device exponentiates the first partial signature. In a parallel embodiment, each signing device affixes a partial signature, and the plurality of partial signatures are multiplied together to form the final signature. Security of the system is enhanced by distributing capability to affix signatures among a plurality of signing devices and by distributing authority to affix a partial signature among a plurality of authorizing agents.

대표청구항 ▼

[ What is claimed is:] [1.] A digital signing method comprising steps of:generating shares of a private signature key;storing shares in separate electronic signing devices;certifying multiple authorizing agents for signing devices; andfor each of a plurality of signing devices, affixing a partial si

[ What is claimed is:] [1.] A digital signing method comprising steps of:generating shares of a private signature key;storing shares in separate electronic signing devices;certifying multiple authorizing agents for signing devices; andfor each of a plurality of signing devices, affixing a partial signature to an electronic message in response to authorization from a minimum number of authorizing agents;wherein a plurality of partial signatures constitutes a digital signature.