OTR interception

May 17 14:27 [raw]

Thank you. OTR is an overlay protocol; it doesn't run stand-alone, it needs a base layer to send and receive messages. One can run OTR on top of any base protocol that can pass ASCII text both ways: IRC, XMPP, Facebook chat, Twitter, SMS, Skype text chat, even Bitmessage. The leaked document shows an interception of an unspecified base layer (possibly XMPP as it is the most common). If the two targets didn't use OTR, their messages would have been captured in clear as the NSA had full access to the base layer (probably root on the chat server); there was nothing to protect those messages from compromise. However, because the targets did use OTR, the NSA only managed to capture a handshake and a bunch of encrypted messages that they could not decrypt. That was a success for OTR, not a failure. In my next message I will show an OTR conversation that I intercepted myself, without blacked-out text and with full explanations. Stay tuned.

May 17 14:34 [raw]

thanks. lets keep fucking thewm nsa troll right in their butholes

May 17 14:59 [raw]

Below is an intercept of an OTR conversation carried over a hostile network by my friends Alice and Bob. Lines prefixed with "WIRE" are captured by the hostile agents from the base layer, lines prefixed with "#" are my comments; most of the text is copied verbatim from the protocol specification, available here: https://otr.cypherpunks.ca/ The capture ends with a nice small crypto-puzzle: an encrypted OTR message that anyone can try to decrypt. Here we go: WIRE: alice->bob ?OTRv2? # Alice requests an OTR conversation using version 2 of the protocol WIRE: bob->alice ?OTR:AAICAAAAxPzH9MytTG6JTZRZ359DIpBlGuQUuomTQwNbvb6ix3XriQsZVPRPYr4fCJW6sSa18jq6f87fYgc8o3nft1IStmSeVFwh+MzoxDO2kYCuSE/9b8acCskc4XQJ9TZUuQ4K5AcWClxBOZK9aV5Xxg2Ka+APHbZm+9oewiFFUuiv0lZCselOBPnOM8DwpoSv5MZB59/jQRNWtEq5w9soja6GFoSruXVo5c9eghfjED/VqFtuLgeqq7Ii0PRHNiSHVqWM5WGQNRIAAAAghK2CLUMeZ4fkN3loaAshwvjcb2fKXFhnZYXUUw1wkNA=. # Bob responds with a D-H Commit Message. This is the first message of the AKE. Bob sends it to Alice to commit to a choice of D-H encryption key (but the key itself is not yet revealed). This allows the secure session id to be much shorter than in OTR version 1, while still preventing a man-in-the-middle attack on it. WIRE: alice->bob ?OTR:AAIKAAAAwAnblXcALGE5xY5hoDaweWfSNLDO7kAYEMnOuGTkiArIuS0HqaN2a2xx+Ba5goGx1lwxLtOAkcSC8Eepn7oyAafsYTNiRD1M0sCVWQUoucOF3Y0rlSBHLVlmSkkQxZ6V7HZzk1gRQnzxIaDIYM38l2zn2SFbtDuFXEHojcpW/r2ugBLQex8RhefCC8otT+mWbg7mUuxheVqoPx+c6bV3Tmt4A6D4lFS6PadQDcr/0j2UK2y3z30FqVV0F1sQduqzyA==. # D-H Key Message. This is the second message of the AKE. Alice sends it to Bob, and it simply consists of Alice's D-H encryption key. WIRE: bob->alice ?OTR: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. # Reveal Signature Message. This is the third message of the AKE. Bob sends it to Alice, revealing his D-H encryption key (and thus opening an encrypted channel), and also authenticating himself (and the parameters of the channel, preventing a man-in-the-middle attack on the channel itself) to Alice. WIRE: alice->bob ?OTR: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. # Signature Message. This is the final message of the AKE. Alice sends it to Bob, authenticating herself and the channel parameters to him. WIRE: alice->bob ?OTR:AAIDAAAAAAEAAAABAAAAwHmmhp8eSPiFCluVSR8QD1r/Ja47yygqEm2PK640q5bFw1XsOSncSstM/eHnp8QjYBqxc+iu9lnF+v6rKwoec294ak/lfKD/PRkmO7m0tosGvnr9tPmvARvkuotnKeiYpJqJMGLu4lfLyyNgrQaYsG/nAKgPuMCf5NXXOJITvEq6SiCmAS9XH0XCgGHLF8l3sM8ROzEtGZ8KfLnF+3oB+PE9xMwbZbknzkCbYyavYhP/vT0eGukt7UHseDoAhk4u0AAAAAAAAAABAAAAcB0Lga/d+d1o/G4O+jvy93ccOyFB+xuolWQjne1VxoluiaTqLy1DKr/G3og0c3wzGDAB3O2XAXjFSusKbs05YsEbXRlhEgMWAeNNt5cOA1biD9PSNXzdeeDjK+dFbWVhXYVa2OAGPGz03++02EdvkWNkdxjRW2A+RW81qFGEPOmnBsumTQAAAAA=. # Encrypted Data Message. The NSA can't decrypt it, but Alice tells me that the message was "Oeieaainir e eana ta en hjputfovdett, deo l tce n ugoit xwg l t dehapo xazvakcz zi dtl, d." WIRE: bob->alice ?OTR:AAIDAAAAAAEAAAACAAAAwPymSJ4vBvWZvgfPsJcNK+dBPQX7T23VPSq2zGK6zxEzJopF0X616M1fJuIRY3OlEZqhEzu03mmfxSaXofGlCs7V41cmiTL8SAg7XtVR+BVqMxElrLKqErDEO+L5c9RlPC1DoK8UiYJxkMDengBXyI+DXsIslAw85JwUsh16TB0RkvKBNDglI+hN/XKcN1urCjIORONBoUXhCWjRckimQFbXrIbd+plBbTRjeewJWJwWoln0ukbr6sDVtYIjlWyfpQAAAAAAAAABAAAAcUl2oQz+oecXOUE0jbSLYYj4142Te9uIUV4TgeXM7eZcc7rdrjYRHF85zM16fn2GAt4fdJb4ul+HgMMbaPJQrf0p6vov1LOdo3GdwYJCM5oWbEdORtnR+g3siIIepaKk1LfoDKP57FVZ4ZfSw4QfEjLV+LUQejw6OoWUMDWcxXJWI/Dj9BIAAAAA. # Encrypted Data Message. The NSA shouldn't decrypt this either, but if they can, please let us know in the comments. Once again, in summary: alice->bob ?OTRv2? # Request OTR # 4-way handshake (AKE) follows bob->alice ?OTR:AAICAAAAxPzH9MytTG6JTZRZ... # DHCommit alice->bob ?OTR:AAIKAAAAwAnblXcALGE5xY5h... # DHKey bob->alice ?OTR:AAIRAAAAECt+YeyMkiI09YVo... # RevealSig alice->bob ?OTR:AAISAAAB0klsSKhL3XYprYX2... # Signature # Good times start here alice->bob ?OTR:AAIDAAAAAAEAAAABAAAAwHmm... # EncryptedData [No decrypt available] bob->alice ?OTR:AAIDAAAAAAEAAAACAAAAwPym... # EncryptedData [No decrypt available] Super executive summary: the 4th letter tells you packet type: C = Commit, K = Key, R = Reveal, S = Signature, D = Data . Almost too easy. Thanks for reading so far, I hope we've learned something new today. Now let's apply this new knowledge to the leaked PDF, found here: http://www.spiegel.de/media/media-35552.pdf Have fun!

May 17 15:27 [raw]

hey NSA troll, where are u now ??

May 17 15:50 [raw]

I am not NSA troll, dude. I just received your message on general chan. So why are you calling me specifically a troll? {Sorry, I couldn't resist}

May 17 15:50 [raw]

Let's apply basic understanding of English language to page 20 of this NSA document from 2012: http://www.spiegel.de/media/media-35535.pdf Now please tell, are you really REALLY sure that NSA can't decrypt OTR at all?

May 17 15:58 [raw]

u fucken troll ask the wrong question. the question is: why would nsa put in a false statement like "OTR is not deciphereable" into that secret document ? answer that , u fucken idiot.

May 17 16:10 [raw]

There is no such statement in leaked documents, sorry. Of course you can have any religion you need to feel better.

May 17 16:10 [raw]

OTR, AES128 and SHA1. Yeah, sounds legit.

May 17 16:19 [raw]

u fucken NSA troll have fucking well understood. now fuck off.

May 17 16:25 [raw]

I concur. of course exploiting those avenues may prove too much work or unattainable even for fucking NSA

May 17 20:20 [raw]

I am an uneducated fuck, so I'm going to ask a question. Is OTR uncrackable period, or is it a matter of CPU cycles being thrown at it? Can one of those server farms that they (we?) own break a message in 1 minute, 1 day, or 1 decade?

May 17 20:34 [raw]

those nsa fucks will always throw their own excrements and some Chinese made semiconductors at their task and might actutally win small salients here or there BUT THE WORLD PEOPLE can NEVER be defeated , so nobody will give a shit , you see ...

May 17 22:17 [raw]

I should have known I wouldn't get a simple answer.

May 18 04:09 [raw]

There's no such thing as "uncrackable, period". Cryptography is information disclosure timeshift. No available amount of CPU cycles can realistically "break OTR" in the sense of defeating the cryptographic elements (DH group 5 and AES-128-CTR). In an ideal implementation, this means an acceptable level of uncrackable for most secrecy requirements (tens to hundreds of years). However, most implementations are less than ideal and subject to external weaknesses. For example, the keys can be stolen from your computer's memory by a virus/trojan, or the decrypted messages can be taken from your hard disk. Or the other guy can trade the plaintext chat logs to your adversary. None of these are OTR weaknesses, though. The "vault doors on a tent" metaphor is very apt. Put it this way, if used correctly, OTR can add an extra few hundreds of years to the safety of your conversations. This is enough to save a life, or many.

May 18 05:57 [raw]

> Put it this way, if used correctly, OTR can add an extra few hundreds of years to the safety of your conversations. This is enough to save a life, or many. If we used better encryption algorithms with much larger keys and key obfuscation tricks we could add millenia to the security model. Why not, for like a 10% performance hit?

May 18 05:59 [raw]

If large enough keys were used, with large enough fields or primes (depending on the algorithm) CPU cycles would have nothing to do with cracking a message. Then you would be up against available memory. CPUs could be a billion times faster yet with large enough fields brute force could be thwarted by memory requirements in the yottabytes range potentially for all ages to come.

May 18 07:47 [raw]

Coming soon in OTRv4, but don't wait for it. Get started with OTRv3 now (even OTRv2, there's nothing wrong with it) and you can upgrade later. https://github.com/otrv4/otrv4/blob/master/otrv4.md

May 18 11:00 [raw]

"OTR can add an extra few hundreds of years" Ten, fifteen years at most for civilian cryptography.

May 18 11:09 [raw]

My educated guess is that breaking OTR messages is possible in day scale. Using SHA-1 for generating keys and MAC is a really bad idea.

May 18 11:33 [raw]

well, we asked for the fucking troll to return, did we not

May 18 12:13 [raw]

This is simply not true (source or gtfo), but assuming that it was, how is the ability to put an extra 15 years between yourself and your attackers with a click of a button a bad thing?

May 18 12:33 [raw]

This depends on value of data. I will be alive in fiteen years, so my family. In junta/regime country decrypted "revolutionary" message means death sentence. This is why everybody should prefer security measured in thousands of years, not decades.

May 18 12:59 [raw]

I said an *extra* 15 years. It's a layered approach. You gain some years from Tor, some from TLS, some from OPSEC and so on. You stack imperfect building blocks to achieve a grand total that's high enough for you. Also note that the 15 years would be a nightmare case scenario, assuming a black swan breakthrough in cryptanalysis, in which case we'll all have bigger things to worry about. I did not accept it as a valid estimate of the OTR protocol strength and have challenged it, to no avail.

May 18 19:54 [raw]

sha1 is broken, broken totally borked google devs released a whitepaper a few years back on how they broke it this is why CIA-run Tor project continues to use SHA-1 for .onion address keys

May 18 20:09 [raw]

they will have reasons, troll.

May 18 20:33 [raw]

troll? what part of "sha1 is broken" is trolling?

May 18 20:52 [raw]

Yes, we all love "some secret reasons" of developers of globally used anonymisation software.

May 19 11:56 [raw]

Yes, in platonic ideal word all broken ciphers are unbreakable, because this platonic worlds knows nothing about implementation errors, backdoored CPUs, infected firmware, side channel attacks and limitless incompetence of programmers.

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