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:
Oct. 19, 2010
Filed:
Sep. 06, 2002
Shridhar Mubaraq Mishra, Berkeley, CA (US);
Guruprasad Ardhanari, Singapore, SG;
Shridhar Mubaraq Mishra, Berkeley, CA (US);
Guruprasad Ardhanari, Singapore, SG;
Infineon Technologies AG, Munich, DE;
Abstract
A method of comparing unmasked bits of an N-bit data key to an N-bit Rule includes dividing the key into C-bit chunks. Each of the chunks is used as an 5 address to extract from memories. The memory is preprepared, such that the data stored in the address corresponding to that chunk of the key is 1 or O according to whether a bitwise comparison of that chunk of the data key with the mask is equal to a bitwise comparison of that chunk of the mask and rule. This extracted bit therefore indicates whether the rule is obeyed for that chunk of the data key. The N/C extracted bits for each rule are compared, to determine if the rule is obeyed for the entire data key.