![]() OTR sessions with the Pidgin and Spark IM clients. Note that this Library uses the Bounc圜astle library for most of its cryptographic functions. Off-The-Record (OTR) is a protocol that provides security around real-time instant messaging (IM) communications. ![]() Confidentiality: Messages are encrypted.Authentication: You are who you say you are.Perfect Forward Secrecy: Each instant message sent is encrypted using a different encryption key which is discarded after use.Īnd messages sent by you can be verified by your chat partner (buddy) and vice versa.Compromising a single encryption key does not impact on theĬonfidentiality of other messages sent or those to be sent in the future. In addition, each message is authenticated using a different Message Authentication Code (MAC) key. Deniability: The MAC keys that have already been.That since these keys are in the public domain any one could have created these Used and will not be used again are included in outgoing messages. Keys (including your chat partner) and therefore forged a message. In addition to the above, the OTR also defines a Socialist Millionaire Protocol (SMP) that could be used to detect a man-in-the-middle attack during an ongoing conversation.įor the SMP process to successfully complete, you and your chat buddy must have a secret that is known to just you and him/her. The failure of the SMP process is an indication that the encrypted session between you and your chat partner has been hijacked by a third party. Let’s assume that Alice wants to establish an OTR session with her friend, Bob. In order to do this she has to request an OTR session from Bob and on receipt of this request Bob starts the OTR session proper. _alice_otr_session_manager.RequestOTRSession(_my_buddy_unique_id, OTRSessionManager.GetSupportedOTRVersionList()) _alice_otr_session_manager.CreateOTRSession(_my_buddy_unique_id) _alice_otr_session_manager.OnOTREvent += new OTREventHandler(OnAliceOTRMangerEventHandler) _alice_otr_session_manager = new OTRSessionManager(_my_unique_id) * Create OTR session and Request OTR session */ OTRSessionManager _alice_otr_session_manager = null The code below shows how Alice goes about requesting an OTR session. As soon as the OTR manager is initialized, Observe that the OTR session manager is initialized using your unique ID. It must be connected to the OTR event handler. See the OTR Event section for a description of these event types.Įach OTR session established for the buddies you are communicating with must be created using the unique ID of that buddy. Requesting an OTR session involves calling the RequestOTRSession function and passing it your buddy’s ID and In other words, your buddy’s unique ID doubles as Once this is done, references to a session are achieved using this unique ID. The versions supported by this library are contained in a string list that can be accessed by calling This Library supports versions 2 and 3 of the OTR protocol. The GetSupportedOTRVersionList static function of the OTRSessionManager. If the client already has a DSA key, then the client can pass the DSA public and private key parameters OTR uses Digital Signature Algorithm (DSA) public keys as part of the authentication and SMP processes. I.e., P, Q, G and X to the CreateOTRSession function. The DSA key parameters must be formatted as a DSAKeyParams objectīefore it is passed to the function in question. If the client doesn’t have a DSA key, a random one is created by this library. See the accompanying OTRLibTest console application for examples on how this is accomplished. Your current DSA key can be gotten by calling GetSessionDSAHexParams function. It returns a DSAKeyParams object that contains the P, Q, G and X elements of the key. The OTR specification defines an object called a Finger Print. The Finger Print is computed using the DSA public key parameters (i.e., P, Q, G and Y) as input. To retrieve your Finger Print in hexadecimal string call the GetSessionDSAFingerPrint function. Similarly, to retrieve the Finger Print of your buddy call the GetMyBuddyFingerPrint function.Ĭopy Code /* Encrypt and send a message to Bob */ /* Assume that message_string is the message to be encrypted and sent to bob*/ _alice_otr_session_manager.EncryptMessage(_my_buddy_unique_id, message_string) #OTR PIDGIN DOWNLOAD CODE#
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