Secure authenticated distance measurement
The invention relates to a method for a first communication device to perform authenticated distance measurement between the first communication device and a second communication device, wherein the first and the second communication device share a common secret and the common secret is used for performing the distance measurement between the first and the second communication device. The invention also relates to a method of determining whether data stored on a first communication device are to be accessed by a second communication device. Moreover, the invention relates to a communication device for performing authenticated distance measurement to a second communication device. The invention also relates to an apparatus for playing back multimedia content comprising a communication device.
1. A second device for receiving delivery of a protected content from a first device, the second device comprising a processor circuit, the processor circuit arranged to execute instructions, the instructions arranged to:
provide a certificate to the first device prior to receiving a first signal, wherein the first signal is sent by the first device, wherein the certificate is associated with the second device;
receive the first signal when the certificate indicates that the second device is compliant with at least one compliance rule;
create a second signal, wherein the second signal is derived from a secret known by the second device;
provide the second signal to the first device after receiving the first signal, wherein the second signal is received by the first device; and
receive the protected content from the first device when the first device determines that the second signal is derived from the secret and a time between the sending of the first signal and the receiving of the second signal is less than a predetermined time.
2. The second device of claim 1 , wherein the secret is securely provided to the second device by the first device.
3. The second device of claim 2 , wherein determining that the second signal is derived from the secret comprises:
modifying the first signal, wherein the modifying requires the secret; and
determining that the modified first signal is identical to the second signal.
4. The second device of claim 2 , wherein determining that the second signal is derived from the secret comprises:
modifying the first signal; and
determining that the modified first signal is identical to the second signal.
5. The second device of claim 2 , wherein the predetermined time is based on a communication system associated with the first device.
6. The second device of claim 2 , further comprising instructions arranged to receive the secret from the first device.
7. The second device of claim 2 , wherein the second signal comprises the first signal modified by the secret.
8. The second device of claim 2 , wherein the secret comprises a random number.
9. The second device of claim 2 , wherein the secret is encrypted with a public key.
10. The second device of claim 2 , wherein the first signal comprises a random number.
11. The second device of claim 2 , wherein the second signal comprises an XOR operation of the first signal with the secret.
12. The second device of claim 2 , wherein determining that the second signal is derived from the secret comprises:
modifying the second signal, wherein the modifying requires the secret; and
determining that the modified second signal is identical to the first signal.
13. The second device of claim 2 , wherein determining that the second signal is derived from the secret comprises:
modifying the second signal; and
determining that the modified second signal is identical to the first signal.
14. The second device of claim 2 , wherein the secret is used for generating a secure channel between the first device and the second device.
15. The second device of claim 1 , wherein determining that the second signal is derived from the secret comprises:
modifying the first signal, wherein the modifying requires the secret; and
determining that the modified first signal is identical to the second signal.
16. The second device of claim 1 , wherein determining that the second signal is derived from the secret comprises:
modifying the first signal; and
determining that the modified first signal is identical to the second signal.
17. The second device of claim 1 , wherein the predetermined time is based on a communication system associated with the first device.
18. The second device of claim 1 , further comprising instructions arranged to receive the secret from the first device.
19. The second device of claim 1 , wherein the second signal comprises the first signal modified by the secret.
20. The second device of claim 1 , wherein the secret comprises a random number.
21. The second device of claim 1 , wherein the secret is encrypted with a public key.
22. The second device of claim 1 , wherein the first signal comprises a random number.
23. The second device of claim 1 , wherein the second signal comprises an XOR operation of the first signal with the secret.
24. The second device of claim 1 , further comprising instructions arranged to provide the secret to the first device.
25. The second device of claim 1 , wherein the secret is used for generating a secure channel between the first device and the second device.
26. The second device of claim 1 , wherein determining that the second signal is derived from the secret comprises:
modifying the second signal, wherein the modifying requires the secret; and
determining that the modified second signal is identical to the first signal.
27. The second device of claim 1 , wherein determining that the second signal is derived from the secret comprises:
modifying the second signal; and
determining that the modified second signal is identical to the first signal.
28. The second device of claim 1 , wherein the secret is known by the first device.
29. A method of receiving a protected content sent from a first device to a second device, the second device comprising a processor circuit, the processor circuit arranged to execute instructions implementing the method, the method comprising:
providing a certificate to the first device prior to receiving a first signal, wherein the first signal is sent by the first device, wherein the certificate is associated with the second device;
receiving the first signal form the first device when the certificate indicates that the second device is compliant with at least one compliance rule;
creating a second signal, wherein the second signal is derived from a secret known by the second device;
providing the second signal to the first device after receiving the first signal, wherein the second signal is received by the first device;
receiving the protected content from the first device when the first device determines that the second signal is derived from the secret and a time between the sending of the first signal and the receiving of the second signal is less than a predetermined time.
30. The method of claim 29 , wherein the secret is securely provided to the second device by the first device.
31. The method of claim 30 , wherein determining that the second signal is derived from the secret comprises:
modifying the first signal, wherein the modifying requires the secret; and
determining that the modified first signal is identical to the second signal.
32. The method of claim 31 , wherein the second signal comprises an XOR operation of the first signal with the secret.
33. The method of claim 31 , wherein the secret comprises a first random number.
34. The method of claim 33 , wherein the secret is used for generating a secure channel between the first device and the second device.
35. The method of claim 33 , wherein the secret is encrypted with a public key.
36. The method of claim 35 , wherein the first signal comprises a second random number.
37. The method of claim 30 , wherein determining that the second signal is derived from the secret comprises:
modifying the first signal; and
determining that the modified first signal is identical to the second signal.
38. The method of claim 30 , wherein the second signal comprises the first signal modified by the secret.
39. The method of claim 30 , wherein determining that the second signal is derived from the secret comprises:
modifying the second signal, wherein the modifying requires the secret; and
determining that the modified second signal is identical to the first signal.
40. The method of claim 30 , wherein determining that the second signal is derived from the secret comprises:
modifying the second signal, wherein the modifying requires the secret; and
determining that the modified second signal is identical to the first signal.
41. The method of claim 29 , wherein determining that the second signal is derived from the secret comprises:
modifying the first signal, wherein the modifying requires the secret; and
determining that the modified first signal is identical to the second signal.
42. The method of claim 29 , wherein determining that the second signal is derived from the secret comprises:
modifying the first signal; and
determining that the modified first signal is identical to the second signal.
43. The method of claim 29 , wherein the predetermined time is based on a communication system associated with the first device.
44. The method of claim 29 , further comprising receiving the secret from the first device.
45. The method of claim 29 , wherein the second signal comprises the first signal modified by the secret.
46. The method of claim 29 , wherein the secret comprises a random number.
47. The method of claim 29 , wherein the secret is encrypted with a public key.
48. The method of claim 29 , wherein the first signal comprises a random number.
49. The method of claim 29 , wherein the second signal comprises an XOR operation of the first signal with the secret.
50. The method of claim 29 , further comprising providing the secret to the first device.
51. The method of claim 29 , wherein the secret is used for generating a secure channel between the first device and the second device.
52. The method of claim 29 , wherein determining that the second signal is derived from the secret comprises:
modifying the second signal, wherein the modifying requires the secret; and
determining that the modified second signal is identical to the first signal.
53. The method of claim 29 , wherein determining that the second signal is derived from the secret comprises:
modifying the second signal; and
determining that the modified second signal is identical to the first signal.