🌐 Networking

SSH (Secure Shell)

A protocol for secure remote login and command execution over an untrusted network. It is layered: a transport layer sets up encryption and host-key verification, an authentication service proves the user's identity, and only then does a connection service open channels for commands and file transfer.

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How SSH Servers Get Tricked Into Skipping Authentication

SSH authentication bypasses rarely break the cryptography. Three real failure modes: doing the protocol steps out of order, verifying a signature incompletely, and trusting the shape of a username.

intermediate 5 min read

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