Memory authentication with redundant encryption

A system comprising:

• an encryption and decryption module configured to encrypt data using a first encryption key to generate cipher text and encrypt the data using a second encryption key different than the first encryption key to generate an authentication tag;
• a memory configured to store the cipher text and the authentication tag;
• and
• a processor configured to authenticate the contents of the memory by at least controlling the encryption and decryption module to decrypt the cipher text to generate first plaintext and decrypt the authentication tag to generate second plaintext, and comparing the first and second plaintext.

A non-transitory computer-readable storage medium comprising instructions that upon execution cause a processor to:

• control an encryption and decryption module to encrypt data to be stored by a memory using a first encryption key to generate cipher text;
• control the encryption and decryption module to encrypt the data to be stored by the memory using a second encryption key different than the first encryption key to generate an authentication tag;
• store the cipher text and authentication tag in the memory;
• and
• after storing the cipher text and authentication tag in the memory, retrieve the cipher text and authentication tag from the memory and authenticate the retrieved cipher text, wherein the instructions cause the processor to authenticate the retrieved cipher text by at least:
• controlling the encryption and decryption module to decrypt the cipher text using the first encryption key to generate first plaintext;
• controlling an encryption and decryption module to decrypt the authentication tag using the second encryption key to generate second plaintext;
• and
• comparing the first and second plaintext.