PROTECTION OF DIGITAL CONTENT USING BLOCK CIPHER CRYPTOGRAPHY

摘要

Protection of digital content (300) using a specific application of block cipher cryptography is described. The digital content (300) is encrypted using an encryption key (82) and a calculated initialization vector (305). The digital content (300) includes a plurality of strides (340, 345, 350, 355) of data and each stride (340, 345, 350, 355) includes a string of data (342, 347, 352, 357) to be encrypted and a block of data (344, 349, 354, 359) to be encrypted. The calculated initialization vector (305) to be used to encrypt the block of data (344, 349, 354, 359) is derived from the string of data (342, 347, 352, 357) in the stride (340, 345, 350, 355) to be encrypted. Furthermore, the initialization vector (305) is calculated by performing an exclusive disjunction function on a seed value (328) and the string of data (342, 347, 352, 357) for each stride (340, 345, 350, 355).