security - Validate credentials against Active Directory *securely* -


when authenticate against active directory described in this answer, how exchange sent on network? encrypted? if not, correct way ensure not sent in clear text?

if principalcontext class implements kerberos protocol authenticate user against active directory, users credential protected according kerberos protocol. both sides makes use of secret key create secure channel using key exchange protocol diffie-hellman.
can find quick explanation kerberos protocol in wikipedia, rfc 4120 official source.
in other hand if uses plain ldap queries, security on transport protocol.


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