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. 07, 2015
Filed:
Jun. 29, 2011
Shay Gueron, Haifa, IL;
Uday Savagaonkar, Portland, OR (US);
Francis X. Mckeen, Portland, OR (US);
Carlos V. Rozas, Portland, OR (US);
David M. Durham, Beaverton, OR (US);
Jacob Doweck, Haifa, IL;
Ofir Mulla, Talmei Elazar, IL;
Ittai Anati, Haifa, IL;
Zvika Greenfield, Kfar Sava, IL;
Moshe Maor, Kiryat Mozking, IL;
Shay Gueron, Haifa, IL;
Uday Savagaonkar, Portland, OR (US);
Francis X. McKeen, Portland, OR (US);
Carlos V. Rozas, Portland, OR (US);
David M. Durham, Beaverton, OR (US);
Jacob Doweck, Haifa, IL;
Ofir Mulla, Talmei Elazar, IL;
Ittai Anati, Haifa, IL;
Zvika Greenfield, Kfar Sava, IL;
Moshe Maor, Kiryat Mozking, IL;
Intel Corporation, Santa Clara, CA (US);
Abstract
A method and apparatus to provide cryptographic integrity checks and replay protection to protect against hardware attacks on system memory is provided. A mode of operation for block ciphers enhances the standard XTS-AES mode of operation to perform memory encryption by extending a tweak to include a 'time stamp' indicator. A tree-based replay protection scheme uses standard XTS-AES to encrypt contents of a cache line in the system memory. A Message-Authentication Code (MAC) for the cache line is encrypted using enhanced XTS-AES and a 'time stamp' indicator associated with the cache line. The “time stamp indicator” is stored in a processor.