What characters can be used for SSKEY in ptktdata ssignon profile records in ACF2?
See PTKTDATA profile record in the ACF2 documentation for more information.
The 16 character hexadecimal representation of the 8-byte encryption key
does not need to be actual characters
e.g. it could be ABCDEFGH in EBCDIC
which converts to C1C2C3C4C5C6C7C8 in HEX
or it could be unrelated to any real characters
eg A1e77f0e00001234