A method and apparatus for use in encrypting and decrypting digital communications converting an initial block to final block based on freely selectable control information and secret key information having double the length of prior art keys and maintaining compatibility with the prior art encryption system.

 
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< Method for copy protection of digital content

> Anti-pirate method for the distribution of digital content by pro-active diversified transmission, associated transmitting device and portable receiving object

> Computer-readable recording medium recording a wireless communication authentication program
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