Methods and apparatuses for selective data encryption

H - Electricity – 04 – N

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H04N 7/16 (2011.01) H04L 9/06 (2006.01) H04L 29/06 (2006.01)

Patent

CA 2728687

A method of encryption, using an encryption key K with key length k, of at least one message M comprising uniformly distributed symbols, k bits are encrypted (830) of messages at least k bits long, while shorter messages are lengthened (840), e.g. by padding or concatenation, to obtain a lengthened message at least k bits long before encryption. The encryption efficiency is thus optimised while the encryption security is retained. The encryption method is particularly suitable for JPEG2000 encoded packets comprising a message M. Also provided are an encryption apparatus (710), a decryption method and a decryption apparatus (910).

Linvention concerne un procédé de chiffrement qui utilise une clé de chiffrement K possédant une longueur de clé k dau moins un message M comprenant des symboles distribués de façon uniforme. k bits de messages dune longueur dau moins k bits sont chiffrés (830), tandis que des messages plus courts sont rallongés (840), par exemple grâce au remplissage ou à la concaténation, de manière à obtenir un message rallongé dune longueur dau moins k bits avant le chiffrement. Lefficacité du chiffrement est ainsi optimisée en même temps que la sécurité du chiffrement est conservée. Le procédé de chiffrement est particulièrement adapté aux paquets codés en JPEG2000 comprenant un message M. Linvention concerne également un appareil de chiffrement (710), un procédé de déchiffrement et un appareil de déchiffrement (910).

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