Method and circuit for data encryption/decryption

USRE44594E1 · kind E1 · reissue

Assignee

• STMicroelectronics SA

Inventors

• Marco Macchetti · Crissier, CH
• Stefano Marchesin · Torino, IT
• Umberto Bondi · Porza, CH
• Luca Breveglieri · Seregno, IT
• Guido Marco Bertoni · Cusano Milanino, IT
• Pasqualina Fragneto · Milano, IT

Key dates

• Filing date: May 29, 2012
• Grant date: Nov 12, 2013
• Expiry date: May 29, 2032

Classification

• Technology area (CPC —): General

Abstract

Data are converted between an unencrypted and an encrypted format according to the Rijndael algorithm, including a plurality of rounds. Each round is comprised of a fixed set of transformations applied to a two-dimensional array, designating states, of rows and columns of bit words. At least a part of the transformations are applied on a transposed version of the state, wherein rows and columns are transposed for the columns and rows, respectively.