0 1 2 0 1 2 3 4 0 1 2 Set Operator Security Certificate Security model for PKI Format X.509 format of the certificate. DER or PEM. NONE PEM DER N Number of registers to follow for the certificate UID User ID for the request signature Cert_UID User ID for this certificate Cert_Role Role for this certificate Format Format of this certificate Type Type of this certificate Frag1 First word of this fragment Frag80 Last word of this fragment Total Length Total Length of the Certificate In registers, zero padded. Fragment length Length of this fragment Maximum fragment length is 80 registers Timestamp Timestamp value is the number of seconds since January 1, 2000 Milliseconds Millisecond counter 0-999 Sequence Sequence number of request Shall be advanced for each request Role Signing key used 0-5 Each controller is assigned a key index that maps to their access control role 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