otr_toolkit man page on Debian

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OTR_PARSE(1)							  OTR_PARSE(1)

NAME
       otr_parse,   otr_sesskeys,   otr_mackey,	  otr_readforge,   otr_modify,
       otr_remac - Process Off-the-Record Messaging transcripts

SYNOPSIS
       otr_parse
       otr_sesskeys our_privkey their_pubkey
       otr_mackey aes_enc_key
       otr_readforge aes_enc_key [newmsg]
       otr_modify mackey old_text new_text offset
       otr_remac mackey	 flags	snd_keyid  rcv_keyid  pubkey  counter  encdata
       revealed_mackeys

DESCRIPTION
       Off-the-Record (OTR) Messaging allows you to have private conversations
       over IM by providing:
	- Encryption
	  - No one else can read your instant messages.
	- Authentication
	  - You are assured the correspondent is who you think it is.
	- Deniability
	  - The messages you send do not have digital signatures that are
	    checkable by a third party.	 Anyone can forge messages after a
	    conversation to make them look like they came from you.  However,
	    during a conversation, your correspondent is assured the messages
	    he sees are authentic and unmodified.
	- Perfect forward secrecy
	  - If you lose control of your private keys, no previous conversation
	    is compromised.

       The OTR Toolkit is useful for analyzing and/or  forging	OTR  messages.
       Why  do	we  offer this?	 Primarily, to make absolutely sure that tran‐
       scripts of OTR conversations are really easy to forge after  the	 fact.
       [Note that during an OTR conversation, messages can't be forged without
       real-time access to the secret keys on the participants' computers, and
       in  that	 case,	all security has already been lost.]  Easily-forgeable
       transcripts help us provide  the	 "Deniability"	property:  if  someone
       claims you said something over OTR, they'll have no proof, as anyone at
       all can modify a transcript to make it  say  whatever  they  like,  and
       still have all the verification come out correctly.

       Here are the six programs in the toolkit:

	- otr_parse
	  - Parse OTR messages given on stdin, showing the values of all the
	    fields in OTR protocol messages.

	- otr_sesskeys our_privkey their_pubkey
	  - Shows our public key, the session id, two AES and two MAC keys
	    derived  from the given Diffie-Hellman keys (one private, one pub‐
       lic).

	- otr_mackey aes_enc_key
	  - Shows the MAC key derived from the given AES key.

	- otr_readforge aes_enc_key [newmsg]
	  - Decrypts an OTR Data message using the given AES key, and displays
	    the message.
	  - If newmsg is given, replace the message with that one, encrypt
	    and MAC it properly, and output the resulting OTR Data Message.
	    This works even if the given key was not correct for the original
	    message, so as to enable complete forgeries.

	- otr_modify mackey old_text new_text offset
	  - Even if you can't read the data because you don't know either
	    the AES key or the Diffie-Hellman private key, but you can make a
	    good guess that the substring "old_text" appears at the given
	    offset in the message, replace the old_text with the new_text
	    (which must be of the same length), recalculate the MAC with the
	    given mackey, and output the resulting Data message.
	  - Note that, even if you don't know any text in an existing message,
	    you can still forge messages of your choice using the
	    otr_readforge command, above.

	- otr_remac mackey flags snd_keyid rcv_keyid  pubkey  counter  encdata
       revealed_mackeys
	  - Make a new OTR Data Message, with the given pieces (note that the
	    data part is already encrypted).  MAC it with the given mackey.

SEE ALSO
       Off-the-Record	  Messaging,	 at	http://www.cypherpunks.ca/otr/
       ⟨http://www.cypherpunks.ca/otr/⟩

AUTHOR
       otr_toolkit was written by the OTR Dev Team <otr@cypherpunks.ca>.

			       October 27, 2005			  OTR_PARSE(1)
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