A cryptosystem based on a Jacobian of a hyperelliptic curve is being used. Various methods and apparati are provided for generating a compressed data format that identifies one or more points—on the Jacobian of the hyperelliptic curve, and for subsequently decompressing the compressed format data.

 
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> Key exchange via a portable remote control device

> Encryption method and apparatus with forward secrecy and random-access key updating method

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