The invention relates to a method for protecting one or more computer systems using the same secret key (Ks) cryptographic algorithm, characterized in that the way in which said calculation is performed depends, for each computer system and for each secret key, on secret data (Ds) stored in a secret area of the computer system or systems.

 
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< Cryptographic methods and apparatus using word-wise montgomery multiplication

< Randomization-encryption system

> Data hiding in communication

> In a subscriber network receiving digital packets and transmitting digital packets below a predetermined maximum bit rate

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