This invention concerns a consumable authentication method for validating the existence of an untrusted chip. A random number is encrypted using a first key and sent to an untrusted chip. In the untrusted chip it is decrypted using a secret key and re-encrypted together with a data message read from the untrusted chip. This is decrypted so that a comparison can be with the generated random number and the read data message.

 
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> Synthesis subband filter for MPEG audio decoder and a decoding method thereof

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