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README.md

piped (pronounced "ess-pipe-dee") is a utility for creating symmetrically encrypted and authenticated pipes between socket addresses, so that one may connect to one address (e.g., a UNIX socket on localhost) and transparently have a connection established to another address (e.g., a UNIX socket on a different system). This is similar to 'ssh -L' functionality, but does not use SSH and requires a pre-shared symmetric key.

Spiped uses strong and well-understood cryptographic components: The initial key negotiation is performed using HMAC-SHA256 and an authenticated Diffie-Hellman key exchange over the standard 2048-bit "group 14"; following the completion of key negotiation, packets are transmitted encrypted with AES-256 in CTR mode and authenticated using HMAC-SHA256. The simplicity of the code — about 6000 lines of C code in total, of which under 2000 are specific to spiped (the rest is library code originating from kivaloo and Tarsnap) — makes it unlikely that spiped has any security vulnerabilities.

On the author's 2.5 GHz Intel Core 2 laptop, spiped operates at approximately 300 Mbps.