Security protocols Confluence uses for syncing with Active Directory
Platform Notice: Server and Data Center Only - This article only applies to Atlassian products on the server and data center platforms.
What is the auth type that Confluence uses with Active Directory?
Crowd is using Spring LDAP which in turn using standard Java API. For sync data (between Confluence and Active Directory), Java will use either plain connection or SSL connection to query data from AD. Normally, credentials will be sent in plain text (except LDAP version 3 which support SASL), more information can be found in here.