초록 ▼

A method for loading secret data, such as an application key, on a smart card (6), which involves storing a random key on the card (6), encrypting the random key on the basis of a public key, and providing the encrypted random key to a central processing station (4). The encrypted random key is decr

A method for loading secret data, such as an application key, on a smart card (6), which involves storing a random key on the card (6), encrypting the random key on the basis of a public key, and providing the encrypted random key to a central processing station (4). The encrypted random key is decrypted at the central station on the basis of a secret key, and the station (4) encrypts data on the basis of the random key and transmits it to the smart card (6). The smart card decrypts the encrypted data on the basis of the random key. The random key can be generated internally and stored on read protected memory (23) of the card (6). The public key encrypting and secret key decrypting steps may be based on the RSA algorithm, using a small encryption exponent.

대표청구항 ▼

[ I claim:] [15.] A communications system comprising smart card means and a central processing station, said smart card means including:means for storing a random key on a smart card,means for encrypting said random key using a public key; andmeans for decrypting data encrypted using said random key

[ I claim:] [15.] A communications system comprising smart card means and a central processing station, said smart card means including:means for storing a random key on a smart card,means for encrypting said random key using a public key; andmeans for decrypting data encrypted using said random key; and said central station including:means for decrypting the encrypted random key using a secret key, andmeans for encrypting data using said random key and transmitting the encrypted data to said smart card.