Great work! :-) On 6/6/17 2:11 PM, Vanitas Vitae wrote: > I have the honour to announce the latest release of Smack! Version 4.2 > brings among bug fixes and additional features like Explicit Message > Encryption (XEP-0380 <https://xmpp.org/extensions/xep-0380.html>) and > Message Processing Hints (XEP-0334 > <https://xmpp.org/extensions/xep-0334.html>) support for OMEMO > <https://conversations.im/omemo/> Multi-End-Message-and-Object > encryption (XEP-0384 <https://xmpp.org/extensions/xep-0384.html>). OMEMO > was developed by Andreas Straub for the Conversations messenger (also as > a Google Summer of Code project) in 2015. Since then it got quite > popular and drew a lot of attention for XMPP in the media. My hope is > that my efforts to develop an easy to use Smack module will result in an > even broader adoption. > > The Smack release is available from the Maven snapshot repositories. > > OMEMO is a protocol for multi-end to multi-end encrypted communication, > which utilizes the so called Double Ratchet algorithm. It fulfills > amongst the basic requirements of encrypted communication > (confidentiality, authenticity and integrity) also the properties of > deniability and forward secrecy as well as future secrecy. Smacks > implementation brings support for encrypted single and group chats > including identity management and session renegotiation. > > Current implementations (as well as this one) are based upon the > libsignal library developed by OpenWhisperSystems for their popular > Signal (formerly TextSecure) messenger. Smacks OMEMO support is > structured in two modules. There is smack-omemo (APL licensed), which > contains the logic specified in the XEP, as well as some basic > cryptographic code. The other module smack-omemo-signal (GPLv3 licensed) > implements some abstract methods defined by smack-omemo and encapsulates > all function calls to libsignal. > > Currently smack-omemo-signal is the only module available that > implements the double ratchet functionality, but there has been a lot of > discussion on the XMPP Standards Foundations mailing list regarding the > use of alternative (more permissively licensed) libraries for OMEMO > (like for example Olm <https://matrix.org/git/olm/about>, a double > ratchet implementation from our friends over at the [matrix] > <https://matrix.org/> project). So once there is a new specification > that enables the use of other libraries, it should be pretty easy to > write another module for smack-omemo enabling OMEMO support for clients > that are not GPLv3 compatible as well. > > Smack’s OMEMO modules are my first bigger contribution to a free > software project and started as part of my bachelors thesis. I’m quite > happy with the outcome :) > > Vanitasvitae > >
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