Authentication and securing of write-once, read-many (WORM) memory devices
View Patent ↗These embodiments relate to authentication and securing of write-once, read-many (WORM) memory devices. In one embodiment, a memory device comprises a controller operable in first and second modes of operation after stored security information is validated, wherein in the first mode of operation, the memory device operates in a read-only mode, and wherein in the second mode of operation, the memory device operates in a write-once, read-many (WORM) mode. In another embodiment, the controller is operative to perform security methods.
1. A memory device comprising:
a memory storing security information; and
a controller in communication with the memory, wherein the controller is operative to:
place the memory device in an operational state only after a host device validates the stored security information; and
after the memory device is in the operational state:
power-up in read-only mode;
receive a command from the host device to switch to a write-once, read-many (WORM) mode;
in response to the command from the host device, switch from the read-only mode to the WORM mode; and
while in the WORM mode:
receive a write command from the host device; and
determine if the write command should be performed.
2. The memory device of claim 1 , wherein the stored security information is unique to the memory device.
3. The memory device of claim 1 , wherein the stored security information is unique to a batch of memory devices that includes the memory device.
4. The memory device of claim 1 , wherein information used to validate the stored security information is stored on the host device.
5. The memory device of claim 1 , wherein information used to validate the stored security information is stored on a server in communication with the host device.
6. The memory device of claim 1 , wherein the stored security information comprises an RSA certificate, and wherein information used to validate the RSA certificate comprises a certificate authority root certificate and a certificate revocation list.
7. The memory device of claim 1 , wherein, after the stored security information is validated, a flag is stored in the memory device to place the memory device in the operational state.
8. The memory device of claim 1 , wherein the stored security information is stored in a hidden area in the memory device.
9. The memory device of claim 1 , wherein the memory device is placed in the operational state after the stored security information is validated and after at least one additional item is validated.
10. The memory device of claim 9 , wherein the at least one additional item comprises a time stamp or an identifier of the memory device.
11. The memory device of claim 9 , wherein at least one of the stored security information and the at least one additional item is encrypted.
12. The memory device of claim 1 , wherein the stored security information is automatically validated by the host device.
13. The memory device of claim 12 , wherein the host device is operated by an authorized user.
14. The memory device of claim 1 , wherein the memory comprises NAND.
15. A method for authenticated a memory device, the method comprising:
performing the following with a memory device comprising a controller:
receiving a request from a host in communication with the memory device for security information stored in the memory device;
sending the security information to the host;
if the security information is validated receiving information from the host that places the memory device in an operational state; and
after the memory device is in the operational state:
powering-up in read-only mode;
receiving a command from the host device to switch to a write-once, read-many (WORM) mode;
in response to the command from the host device, switching from the read-only mode to the WORM mode; and
while in the WORM mode:
receiving a write command from the host device; and
determining if the write command should be performed.
16. The method of claim 15 , wherein the stored security information is unique to the memory device.
17. The method of claim 15 , wherein the stored security information is unique to a batch of memory devices that includes the memory device.
18. The method of claim 15 , wherein information used to validate the security information is stored on a server in communication with the host device.
19. The method of claim 15 , wherein the security information comprises an RSA certificate, and wherein a certificate authority root certificate and a certificate revocation list are used to validate the RSA certificate.
20. The method of claim 15 , wherein the information received from the host device that places the memory device in an operational state comprises a flag.
21. The method of claim 15 , wherein the security information is stored in a hidden area in the memory device.
22. The method of claim 15 further comprising sending at least one additional item to the host device for validation, wherein the memory device receives the information from the host device that places the memory device in the operational state if both the security information and the at least one additional item are validated.
23. The method of claim 22 , wherein the at least one additional item comprises a time stamp or an identifier of the memory device.
24. The method of claim 22 , wherein at least one of the stored security information and the at least one additional item is encrypted.
25. The method of claim 15 , wherein the stored security'information is automatically validated by the host device.
26. The method of claim 15 , wherein the stored security information is validated by the host device, and wherein the host device is operated by an authorized user.
27. The method of claim 15 , wherein the memory comprises NAND.