[OTR-users] file transfer via OTR?

Paul Wouters paul at cypherpunks.ca
Sat Nov 24 22:17:29 EST 2007


On Sat, 24 Nov 2007, john owen-jones wrote:

> Would it be possible to modify OTR for fle transfer.
> through pidgin?

Yes, but not like you think.

OTR uses a diffie hellman exchange every message. Your CPU
won't be able to do that for large streams (files, audio, video).

What needs to be done is that OTR negotiates a key for a symmetric
cipher (3des, aes, twofish), then uses that to encrypt the file,
and send it via the "regular" sendfile method.

Paul



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