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authenticated protected channel

Definition(s):

  An encrypted communication channel that uses approved cryptography where the connection initiator (client) has authenticated the recipient (server). Authenticated protected channels provide confidentiality and MitM protection and are frequently used in the user authentication process. Transport Layer Security (TLS) [BCP 195] is an example of an authenticated protected channel where the certificate presented by the recipient is verified by the initiator. Unless otherwise specified, authenticated protected channels do not require the server to authenticate the client. Authentication of the server is often accomplished through a certificate chain leading to a trusted root rather than individually with each server.
Source(s):
NIST SP 800-63-3 under Authenticated Protected Channel

  An encrypted channel that uses approved cryptography where the connection initiator (client) has authenticated the recipient (server).
Source(s):
NIST SP 1800-12b