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SSH protects the world’s most sensitive networks. It just got a lot weaker

Researchers have discovered an attack that can undermine the cryptographic SSH protections developed by Tatu Ylönen at Finland’s Helsinki University of Technology in 1995. Called Terrapin, the attack works by interfering with encryption parameters and can only work when an attacker has an active adversary-in-the-middle position on the connection. Terrapin relies on prefix truncation, an attack which removes specific messages at the very beginning of a data stream.

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