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Undeterred by Blu-ray hacks, Sony unveils yet another cipher for DRM
The idea is to make it possible to implement the protection as a relatively inexpensive hardware component for media playback devices. Software implementations are also possible, and Sony claims that they will achieve “high speed performance on a wide variety of processors,” although the company declined to give specific figures.

Block ciphers are a common cryptographic tool used in many existing algorithms, including the US government encryption standard DES—a variant of which has been used to serve secure web pages—and its replacement, AES. Unlike simple ciphers that translate a character at a time, block ciphers encrypt entire blocks of text at once, using a secret key which can be of varying lengths. CLEFIA uses a block size of 128 bits, and can be configured to use keys of 128, 192, or 256 bits.

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