Secure paging with page change detection

A system comprising:

• a memory;
• a processing unit;
• and
• a secure interface control interfaced with the processing unit and the memory, the secure interface control configured to perform operations comprising:
• computing a hash value of a page of the memory;
• comparing the hash value with a previously computed hash value of the page;
• using a per-encryption value per page in encrypting the page based on determining that the hash value matches the previously computed hash value;
• and
• using a modified value of the per-encryption value per page in encrypting the page based on determining that the hash value mismatches the previously computed hash value.

A computer program product comprising a computer readable storage medium, the computer readable storage medium comprising computer executable instructions, which when executed perform a method comprising:

• computing a hash value of a page of memory of a computer system;
• comparing the hash value with a previously computed hash value of the page;
• using a per-encryption value per page in encrypting the page based on determining that the hash value matches the previously computed hash value;
• and
• using a modified value of the per-encryption value per page in encrypting the page based on determining that the hash value mismatches the previously computed hash value.