Patent ID: 7333615
Filing Date: 2008-02-19
Classification: H04L

Abstract:
1. A method for encryption, comprising: receiving a first message comprising a first information encrypted with each of a first set of at least two encryption keys, the first information that is encrypted being combined with an non-encrypted second information, the combination of the encrypted first information and the non-encrypted second information within the first message being further encrypted with each of a second set of at least two encryption keys, wherein the first set of at least two encryption keys is different from the second set of at least two encryption keys; decrypting the first message with each of a third set of at least two encryption keys to yield the non-encrypted second information and the encrypted first information which was encrypted by each of the first set of at least two encryption keys, the third set of at least two encryption keys being different from the first set of at least two encryption keys and the second set of at least two encryption keys; performing an operation on the non-encrypted second information to derive a third information; and encrypting into a second message, a combination of the third information and the encrypted first information, with each of a fourth set of at least two encryption keys, wherein the third information has not been previously encrypted or decrypted and wherein further, the fourth set of at least two encryption keys is different from the first, second and third sets of at least two encryption keys.