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1) At registration time, a client generates a random ID and transmits to the the server. 2) The server provides that registration ID to any client that requests a prekey. 3) Clients include that registration ID in any PreKeyWhisperMessage. 4) Clients include that registration ID in their sendMessage API call to the server. 5) The server verifies that the registration ID included in an API call is the same as the current registration ID for the destination device. Otherwise, it notifies the sender that their session is stale.
TextSecure
A secure text messaging application for Android.
TextSecure is a replacement for the standard text messaging application, allowing you to send and receive text messages as normal. Additionally, TextSecure provides:
- Local Encryption -- All text messages, regardless of destination, that are sent or received with TextSecure are stored in an encrypted database on your phone.
- Wire Encryption -- When communicating with a recipient who is also using TextSecure, text messages are encrypted during transmission.
Current BitHub Payment For Commit:
Bug tracker
Have a bug? Please create an issue here on GitHub!
https://github.com/WhisperSystems/TextSecure/issues
Documentation
Looking for documentation? Check out the wiki!
https://github.com/WhisperSystems/TextSecure/wiki
Mailing list
Have a question? Ask on our mailing list!
whispersystems@lists.riseup.net
https://lists.riseup.net/www/info/whispersystems
Translation
Interested in helping to translate TextSecure? Contribute here:
https://www.transifex.com/projects/p/textsecure-official/
Downloads
TextSecure can be downloaded from the Play Store here:
https://play.google.com/store/apps/details?id=org.thoughtcrime.securesms
Cryptography Notice
This distribution includes cryptographic software. The country in which you currently reside may have restrictions on the import, possession, use, and/or re-export to another country, of encryption software. BEFORE using any encryption software, please check your country's laws, regulations and policies concerning the import, possession, or use, and re-export of encryption software, to see if this is permitted. See http://www.wassenaar.org/ for more information.
The U.S. Government Department of Commerce, Bureau of Industry and Security (BIS), has classified this software as Export Commodity Control Number (ECCN) 5D002.C.1, which includes information security software using or performing cryptographic functions with asymmetric algorithms. The form and manner of this distribution makes it eligible for export under the License Exception ENC Technology Software Unrestricted (TSU) exception (see the BIS Export Administration Regulations, Section 740.13) for both object code and source code.
License
Copyright 2011 Whisper Systems Copyright 2013 Open WhisperSystems
Licensed under the GPLv3: http://www.gnu.org/licenses/gpl-3.0.html