User principal names can follow your current naming convention for user logon
names. As of today, you should restrict principal names to the printable portion of
the POSIX portable character set, which is equivalent to 7-bit ASCII.
4.4.3 Default types of encryption for KDC and security flavors
Several types of encryption are available for use with Network Authentication
Service; by default, Triple-DES is used. Multiple encryption types can be used
within a Kerberos realm. The NFS client and server will negotiate which of the
supported encryption types to use.
NAS 1.4 supports the following types of encryption: ...
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