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:
Sep. 04, 2012
Filed:
Dec. 01, 2009
Mohamed Karroumi, Rennes, FR;
Stéphane Onno, Saint-Gregoire, FR;
Antoine Monsifrot, Rennes, FR;
Thomson Licensing, , FR;
Abstract
An encryption chaining mode takes plaintext block N, generates encryption key N by combining, preferably by XOR, encryption key N-and plaintext block N-and encrypts plaintext block N using an encryption algorithm with encryption key N to output ciphertext block N. Encryption key for the first plaitnext block is generated by XOR-ing a random Initialization vector and a random intialization key K. In a preferred embodiment, initialization key K is subkeys resulting form a key schedule algorithm and encryption key N-is only one of the subkeys. Encryption key for the first plaintext block is generated by XOR-ing a random Initialization vector and one subkey resulting form a key schedule algorithm. Also provided is a corresponding decryption method, an encryption device, a decryption device.