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The negotiated bundle of algorithms an encrypted NNTP session uses for key exchange, authentication, bulk encryption, and integrity checking. Client and server settle on one during the handshake, choosing the strongest both support. Modern suites built on AES-GCM or ChaCha20 cost little processor time even at gigabit speeds, while obsolete RC4 and 3DES suites are switched off on current servers and cause handshake failures with dated clients.
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