Simple Authentication and Security Layer
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Simple Authentication and Security Layer (SASL) is a challenge-response authentication method often used with IMAP, LDAP, POP, SMTP and XMPP. SASL only handles authentication, and another mechanism (such as TSL) is needed for encrypting transferred content.
External Links
IETF: [Simple Authentication and Security Layer (sasl) Working Group], page has links to related RFCs.