| 摘要 |
A method of determining that two interconnected data processing entities (1, 3) are authenticated to operate together. The method comprises (1) causing one of the entities (1) to encrypt test data according to a first encryption scheme, and to transmit the encrypted data to the other entity (3), the test data being different on each occurrence of step (1); (2) causing the other entity (3) to decrypt the received encrypted test data, to encrypt the decrypted test data according to a second, different encryption scheme, and to transmit the data encrypted by the second entity to the first entity (1); and, (3) causing the first entity (1) to decrypt the received, encrypted data, to compare the decrypted data with the original test data, and to authenticate that the two entities can cooperate together if the decrypted data is the same as the original test data. The test data are obtained from a message received by the one entity (1). |
