Memory storage device and method
The present disclosure relates to secure storage, in a non-volatile memory, of initial data encrypted using a second data, including selecting a pointer aimed at an initial address of a memory cell of an initial part of the non-volatile memory, and encrypting the pointer using the second data; and-storing the encrypted pointer in the non-volatile memory.
1. A method for securely storing information, the method comprising:
selecting a pointer aiming towards an initial address of a memory cell of an initial part of a non-volatile memory;
reading a first data stored in the memory cell at the initial address;
encrypting the first data using a second data;
encrypting secret data using the encrypted first data;
encrypting the pointer, including the initial address, using the second data; and
storing the encrypted secret data and the encrypted pointer in of the non-volatile memory.
2. The method according to claim 1 , wherein the pointer is randomly selected.
3. The method according to claim 1 , wherein the pointer is selected from a predefined group of pointers aiming at memory cell addresses of the initial part of the non-volatile memory.
4. The method according to claim 1 , wherein the encrypted secret data and the encrypted pointer are stored outside of the initial part the non-volatile memory.
5. The method according to claim 1 , wherein the first data and the secret data are encrypted using a same type of encryption function.
6. The method according to claim 1 , wherein the first data and the pointer are encrypted using a same encryption function.
7. The method according to claim 1 , wherein the initial part is a non-rewritable part of the non-volatile memory.
8. A method for reading information securely stored in a non-volatile memory, the method comprising:
sending a second data;
reading an encrypted pointer, including an initial address of a memory cell of an initial part of the non-volatile memory, the encrypted pointer being stored in the non-volatile memory;
decrypting the encrypted pointer using the second data;
verifying that the decrypted pointer points to the initial address of the memory cell of the initial part of the non-volatile memory;
reading a first data stored in the memory cell at the initial address;
encrypting the first data using the second data;
reading encrypted secret data stored in the non-volatile memory; and
decrypting the encrypted secret data using the encrypted first data.
9. The method according to claim 8 , wherein the encrypted pointer is a randomly-selected pointer.
10. The method according to claim 8 , wherein the encrypted pointer is from a predefined group of pointers aiming at memory cell addresses of the initial part of the non-volatile memory.
11. The method according to claim 8 , wherein the encrypted secret data is stored in a second memory cell having a second address, and not belonging to the initial part of the non-volatile memory.
12. The method according to claim 8 , wherein the initial part is a non-rewritable part of the non-volatile memory.
13. An electronic system configured to securely store information, the electronic system comprising:
a non-volatile memory;
a non-transitory memory comprising instructions; and
a processor in communication with the non-transitory memory, wherein the processor executes the instructions to:
select a pointer aiming towards an initial address of a memory cell of an initial part of the non-volatile memory;
read a first data stored in the memory cell at the initial address;
encrypt the first data using a second data;
encrypt secret data using the encrypted first data;
encrypt the pointer, including the initial address, using the second data; and
store the encrypted secret data and the encrypted pointer in the non-volatile memory.
14. The electronic system according to claim 13 , wherein the pointer is randomly selected.
15. The electronic system according to claim 13 , wherein the pointer is selected from a predefined group of pointers aiming at memory cell addresses of the initial part of the non-volatile memory.
16. The electronic system according to claim 13 , wherein the encrypted secret data and the encrypted pointer are stored outside of the initial part the non-volatile memory.
17. An electronic system configured to read securely stored information, the electronic system comprising:
a non-volatile memory;
a non-transitory memory comprising instructions; and
a processor in communication with the non-transitory memory, wherein the processor executes the instructions to:
send a second data;
read an encrypted pointer, including an initial address of a memory cell of an initial part of the non-volatile memory, wherein the encrypted pointer is stored in the non-volatile memory;
decrypt the encrypted pointer using the second data;
verify that the decrypted pointer points to the initial address of the memory cell of the initial part of the non-volatile memory;
read a first data stored in the memory cell at the initial address;
encrypt the first data using the second data;
read encrypted secret data stored in the non-volatile memory; and
decrypt the encrypted secret data using the encrypted first data.
18. The electronic system according to claim 17 , wherein the encrypted pointer is a randomly-selected pointer.
19. The electronic system according to claim 17 , wherein the encrypted pointer is from a predefined group of pointers aiming at memory cell addresses of the initial part of the non-volatile memory.
20. The electronic system according to claim 17 , wherein the encrypted secret data is stored in a second memory cell having a second address, and not belonging to the initial part of the non-volatile memory.