| 摘要 |
A system for providing secured access to an application service includes a security token that couples to the application service. The security token performs a first element of a cryptographic technique, such as, for example, encryption or decryption. A proximity token is provided that is associated with the security token. The proximity token performs a second element of the cryptographic technique to validate a communication between the application service and the security token. The proximity token is operable to validate the communication only when the proximity token is located within a predetermined validation distance from the security token or the application service. The security token may perform the first element of the cryptographic technique to verify that the proximity token has validated the communication between the application service and the security token. The system may be configured to provide secured access to the application service when the proximity token validates the communication and to prevent secured access to the application service when the proximity token does not validate the communication.
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