Neither snow nor rain nor heat nor gloom of night stays these violet couriers from the swift completion of their appointed rounds. A project for the curious.

Smoke

Summary of Smoke

• Aliases. Preserve your contacts.
• Almost zero-dependency software.
• Application lock.
• Argon2id and PBKDF2 key-derivation functions.
• Automatic, oscillatory public-key exchange protocol, via SipHash.
• BSD 3-clause license.
• Completed.
• Content is recorded via authenticated encryption.
• Decentralized. TCP, and UDP multicast and unicast.
• Does not require Internet connectivity.
• Does not require registration. Telephone numbers are not required.
• Encrypted communications.
• Eventful tasks. Limited polling.
• F-Droid.
• Fiasco forward secrecy.
• Future-proof software.
• Introduces Cryptographic Discovery. Cryptographic Discovery is a practical protocol which creates coordinated data paths.
• Juggling Juggernaut Protocol!
• Manufactured tool tips!
• McEliece Fujisaka and Pointcheval.
• Message structures do not explicitly expose contents. Header-less protocols! Some messages do include type information.
• Mobile servers via SmokeStack.
• Obfuscation of resident secret keys.
• Optional foreground services.
• Optional silence over the wires.
• Original implementation of SipHash.
• Ozone destinations: private and public repositories.
• Post offices for messages of the past.
• Private servers.
• Public and private public-key servers.
• Rainbow digital signature scheme.
• Reliable distribution of archived messages.
• Reliable distribution of deliverable text messages.
• SPHINCS digital signature scheme.
• SSL/TLS through SmokeStack.
• Semi-compatible with Spot-On via Fire.
• Share files with TCP utilities such as Netcat.
• SipHash-128.
• Smoke and mirrors.
• Software congestion control.
• Software manual included.
• Steam, reliable file sharing. TCP over the Echo!
• Steamrolling, or, real-time broadcasting of inbound Steams to fellow participants.
• Super McEliece: m = 13, t = 118.

Please read https://github.com/textbrowser/smoke/tree/master/Documentation for more information.

Starting a Conversation

1. Download and install Smoke.
2. Download and install SmokeStack, Spot-On, or Spot-On-Lite. More adventurous operators are welcome to create servers using ncat and socat.
3. Define a private or public listener.
4. Connect Smoke to defined listener.
5. Share aliases: super-alias-1, super-alias-2.
6. Define aliases in respective Smoke instances.
7. Share public keys.
8. Done!

Steamrolling is the process of real-time broadcasting of complete and
incomplete inbound Steams. Let’s review a colorful example.
*---------------*
| Participant A | <--------------------------------------
*---------------*                                       |
       |                                                |
       | (Steam A)                                      |
       V                                                |
*---------------*  (Steam A)  *---------------*         | (Steam A)
| Participant B | ----------> | Participant C |         |
*---------------*             *---------------*         |
       |                                                |
       | (Steam A)                                      |
       V                                                |
*---------------*                                       |
| Participant D |                                       |
*---------------*                                       |
       |                                                |
       | (Steam A)                                      |
       V                                                |
*---------------*                                       |
| Participant E | ---------------------------------------
*---------------*
Participants C, D, and E shall receive Steam A data as participant B receives
and writes Steam A data. If the stream of bytes between A and B is interrupted,
the interruption will percolate throughout the network. Unique keys are
established between each of the paired participants.