Which remote access method is designed to negotiate encryption as the very first step of every session and cannot operate in plaintext, thereby protecting all data in transit by default?
Virtual Network Computing (VNC)
Remote Desktop Protocol (RDP)
Telnet
Secure Shell (SSH)
Secure Shell (SSH) begins every connection with a cryptographic key-exchange and cipher negotiation phase defined in RFC 4253. Until that process completes, no user authentication or payload data is allowed, so every packet in the session is encrypted and integrity-checked. RDP sessions are also encrypted by default, but the protocol permits weaker encryption levels and can be downgraded for legacy clients. VNC transmits screen updates in cleartext unless it is tunneled or configured with an add-on security type, and Telnet sends all traffic unencrypted.
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