0 1 2 3 0 1 0 1 2 Secure Dataset Read Response Compute a digital signature over a specified set of data registers Alarm Bitmask alarm code NONE No Alarms ALARM Security Alarm Tampered Timestamp Timestamp value is the number of seconds since January 1, 2000 Milliseconds Millisecond counter 0-999 Algorithm Algorithm used to compute the digital signature For future proof NONE No digital signature For test purposes only AES-GMAC-64 64 bit AES signature algorithm is used ECC-256 256 bit ECC signature algorithm is used Status Status of last read operation SUCCESS Operation succeeded DS Operation failed digital signature check ACL Operation failed access control check One or more registers were not writable by this role OFF Operation failed offset check Offset out of range or missing from multi-register value N Number of registers comprising the digital signature. The value of N must be at least 4 (64 bits) X Number of values from the request A max of 50 values are allocated Value1 Copy of value from register Off1. Unused values shall return 0xFFFF (unimplemented) DS Digital Signature The DS covers all registers from X to N and is N registers in length Request Sequence Sequence number from the request Sequence Sequence number of response Shall be advanced for each response