olemus
sideseanss, mille poolte vahelised sõnumid on krüpteeritud
ja sõnumite terviklust kaitsevad seansivõtmed

NIST SP 800-63-3:
A session wherein messages between two participants are encrypted and integrity is protected using a set of shared secrets called session keys. A participant is said to be authenticated if, during the session, they prove possession of one or more authenticators in addition to the session keys, and if the other party can verify the identity associated with the authenticator(s). If both participants are authenticated, the protected session is said to be mutually authenticated.