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Encrypted control word decryption securing method, involves effectuating trans-encryption from initial encryption towards encryption in microprocessor card, and decrypting encrypted control word by related private key
Encrypted control word decryption securing method, involves effectuating trans-encryption from initial encryption towards encryption in microprocessor card, and decrypting encrypted control word by related private key
The method involves effectuating a trans-encryption from an initial encryption diffused by a tele-broadcasted signal towards an encryption in a microprocessor card (3) by a private proxy function for each user. The card has parameters to implement the proxy function. The encryption is decryptable by a private key suitable for each user. An encrypted control word is decrypted by the corresponding private key. An independent claim is also included for a control unit of encrypted data.
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