why encryption schemes for pap

[DilipSimha.N.M]

hi,

why are encryption schemes for pap required?
it is supposed to be clear-text under all circumstances right???

we can see in radiusd.conf..
# PAP module to authenticate users based on their stored password
   #
   #  Supports multiple encryption schemes
   #  clear: Clear text
   #  crypt: Unix crypt
   #    md5: MD5 ecnryption
   #   sha1: SHA1 encryption.
   #  DEFAULT: crypt
   pap {
       encryption_scheme = crypt
   }


so why is this required??

--DilipSimha
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