Abstract.
ElsieFour (LC4) is a low-tech cipher that can be computed by hand;
but unlike many historical ciphers, LC4 is designed to be hard to break. LC4 is intended for encrypted communication between humans only, and therefore it encrypts and decrypts plaintexts and ciphertexts consisting only of the English letters A through Z plus a few other characters. LC4 uses a nonce in addition to the secret key, and requires that different messages use unique nonces. LC4 performs authenticated encryption, and optional header data can be included in the authentication. This paper defines the LC4 encryption and decryption algorithms, analyzes LC4’s security, and describes a simple appliance for computing LC4 by hand.

An extended version called LS47 can be found on https://github.com/exaexa/ls47, which includes a 3D-printable model of the tiles.

Monocypher is an easy to use crypto library inspired by libsodium and TweetNaCl.

Cryptocat is free software with a simple mission: everyone should be able to chat with their friends in privacy.

   Open source. All Cryptocat software is published transparently.
   Encrypted by default. Every message is encrypted, always.
   Forward secure. Chats are safe even if your keys are stolen.
   Multiple devices. Devices receive messages even when offline.
   File sharing. Securely share files with friends.

Available for Windows, Linux and Mac.

Open source (MIT licensed), available for iOS, Android, Windows, OS X and Linux.

Protect emails, files, hard drives, server certificates and online accounts using cryptography. Your secret keys are always stored securely in the Nitrokey hardware and can't be stolen. The device is PIN-protected and is secured against hardware attacks. Backups protect against loss.

Uses a touch screen.

"Cryptography" is a low-noise moderated mailing list devoted to cryptographic technology and its political impact. Occasionally, the moderator allows the topic to veer more generally into security and privacy technology and its impact, but this is rare.

WHAT TOPICS ARE APPROPRIATE:
"On topic" discussion includes technical aspects of cryptosystems, social repercussions of cryptosystems, and the politics of cryptography such as export controls or laws restricting cryptography.

Discussions unrelated to cryptography are considered off topic.

TrueCrypt will not die

TrueCrypt.ch is the gathering place for all up-to-date information.  Unfortunately TrueCrypt.org is dead. But, we (the pure-privacy people) will help organize a future.

Think of Facebook, Whatsapp, Gmail and Skype rolled into one, without the centralized surveillance and control. secushare employs GNUnet for end-to-end encryption and anonymizing mesh routing (because it has a more suitable architecture than Tor or I2P) and applies PSYC on top (because it performs better than XMPP, JSON or OStatus) to create a distributed social graph.

Taler is a new electronic payment system under development at Inria. Today, this website only presents the advantages our system is expected to provide. We expect to make the payment system available to the general public in 2016.