Public key/signature cryptosystem with enhanced digital signatur

Details Public key/signature cryptosystem with enhanced digital signatur Public key/signature cryptosystem with enhanced digital signatur

1992-05-13

1993-05-25

Swann, Tod R.

Cryptography

Particular algorithmic function encoding

Public key

380 25, H04K 100

Patent

active

052147029

ABSTRACT:
A public key cryptographic system is disclosed with enhanced digital signature certification which authenticates the identity of the public key holder. A hierarchy of nested certifications and signatures are employed which indicate the authority and responsibility levels of the individual whose signature is being certified. The certifier in constructing a certificate generates a special message that includes fields identifying the public key which is being certified, and the name of the certifiee. The certificate is constructed by the certifier to define the authority which is being granted and which may relate to a wide range of authorizations, delegation responsibilities or restrictions given to, or placed on the certifiee. Methodology is also disclosed by which multiple objects such as, for example, a cover letter, an associated enclosed letter, an associated graphics file, etc., are signed together. Methodology is also disclosed for digitally signing documents in which a digital signature is generated for both computer verification and for reverification if a document needs to be reconfirmed by reentering from a paper rendition.

REFERENCES:
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patent: 4759064 (1988-07-01), Chaum
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patent: 4868877 (1989-09-01), Fischer
patent: 4885777 (1989-12-01), Takaragi et al.
patent: 5005200 (1991-04-01), Fischer
patent: 5018196 (1991-05-01), Takaragi et al.

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