The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 22, 1997
Filed:
Dec. 08, 1994
Phillip W Rogaway, Davis, CA (US);
International Business Machines Corporation, Austin, TX (US);
Abstract
Fast message authentication code generation is achieved by preprocessing a secret key into an efficiently-computable representation of a hash function selected from a family of hash functions that share a characteristic property. The secret key is also mapped into a particular cryptographic transform. The hash function and the transform are used to generate the authentication code. In particular, the hash function is applied to the message to generate a hashed message. The cryptographic transform is then applied to the hashed message to generate a tag. The tag and possibly other information (such as the state of a counter) are then combined to create the authentication code.