Can I still run NetBSD/mac68k without a secr distribution installed?
Yes. The security distributions merely contain Kerberized versions of utilities such as telnet in addition to DES decryption code. A standard NetBSD distribution is shipped with cryptographic encryption code which is sufficient for a working NetBSD system. If you simply are wondering if you can run without a secr distribution because you cannot find one, it can be found in the “mac68k/binary/security” subdirectory of the NetBSD release distribution tree.