Nagravision S.a.

Sylvain Pasini

Jean-Philippe Aumasson

An encryption method is disclosed, including two passes over a sequence of N input digital data X, . . . Xblocks where the first pass executes iterative linear algebraic operations from the last input block Xto the first input block Xto obtain a sequence of intermediary resulting Y. . . Yblocks. The second pass executes a block ciphering in a chaining mode from the first intermediary resulting Yblock to the last one Yto obtain a sequence of encrypted output Z. . . Zblocks. The decryption is carried out only in one pass from the first input encrypted Zblock to the last input encrypted block Z. The deciphering operations are executed in an iterative loop of inverse linear algebraic operations after deciphering the first input encrypted Zblock to obtain an output sequence of decrypted X, . . . Xblocks.

Growing community of inventors

Renens, Switzerland

Sylvain Pasini