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IOLAN SDS/SCS/STS/MDC User’s Guide, Version 4.5 449
Symmetric Key File Appendix L
L
Symmetric Key File
This section defines the layout of the NTP/SNTP Symmetric Key file that must be downloaded to the
IOLAN in order to use NTP/SNTP server authentication feature. Each line of the NTP/SNTP
symmetric key file consists of three fields: a key ID in the range 1 to 65,534, inclusive, a key type
and a message digest key consisting of a printable ASCII string equal to or less than 20 characters or
a 40 character hex digit string.
key ID key type
message digest key
1 MD5 CeR{+’9LRTY:a0=P?GOA ascii string
2 MD5 POE)+’9KRMY:P0-PZOQ ascii string
3 MD5 E)+’9KRRTS {+’9LRTpp ascii string
4 MD5 ECeE)+’9KRDSRuurQPiw ascii string
5 SHA1 0e9e44502940294fa788aafaac34ccb126347d34 hex digit string
6 SHA1 f4e9e4454e9e4450294faccb126309ff4ccb1200 hex digit string
7 SHA1 e9e44502949e4450294ccb12634e9e447d3489 hex digit string
8 SHA1 40294fa7894faccb126502944fac4e9e788aafaa hex digit string
Note: Note:1-10 key ID entries are allowed in this NTP/SNTP key file. Both MD5 and SHA1 are
supported. Key ID 0 is excluded.