Cryptography – Key management – Having particular key generator
Reexamination Certificate
2006-03-28
2006-03-28
Barron, Jr., Gilberto (Department: 2132)
Cryptography
Key management
Having particular key generator
C380S028000, C380S030000, C380S285000, C713S171000
Reexamination Certificate
active
07020282
ABSTRACT:
One aspect of the present invention establishes a session key by a receiving unit R transmitting a plurality of quantities for storage in a public repository. A sending unit S:1. retrieves the plurality of quantities; and2. computes and transmits to the unit R a plurality of sender's quantities.The unit R then:1. computes and transmits to the unit S at least one receiver's quantity; and2. computes the session key.The unit S, using the receiver's quantity, computes the session key.Another aspect provides a digital signature. Before transmitting a signed message, the unit S stores a plurality of quantities in the public repository. A unit R, that receives the message and the digital signature, verifies their authenticity by:1. retrieving the quantities from the repository;2. using the digital signature and the quantities, evaluates expressions in at least two (2) different relationships; and3. verifies the digital signature upon finding equality between evaluation results.
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Barron Jr. Gilberto
Kim Jung
Schreiber Donald E.
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