| 摘要 |
This invention concerns a safe data exchange method between two devices locally connected to one another. In a preferred embodiment, the first device ( 10 ) is a security module containing a first encrypting key, said private key (PAKV) of a pair of asymmetric encrypting keys. The second device is a receiver ( 11 ) comprising at least one second encrypting key, said public key (PAKB) of said pair of asymmetric encrypting keys. Furthermore each of the devices comprises a symmetrical key ( 13 ). The first device ( 10 ) generates a first random number (A), which is encrypted by said private key (PAKV), then transmitted to the second device ( 11 ), in which it is decrypted by means of the public key (PAKB). The second device ( 11 ) generates a second random number (B), which is encrypted by said public key (PAKB), then transmitted to the first device ( 10 ), in which it is decrypted by means of the private key (PAKV). A session key (SK), used for safe data exchange, is generated by a combination of the symmetric key ( 13 ) and the random numbers (A, B) generated and received by each of the devices.
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