The Stanford Javascript Crypto Library is a project by the Stanford Computer Security Lab to build a secure, powerful, fast, small, easy-to-use, cross-browser library for cryptography in Javascript. SJCL is secure. It uses the industry-standard AES algorithm at 128, 192 or 256 bits; the SHA256 hash function; the HMAC authentication code; the PBKDF2 password strengthener; and the CCM and OCB authenticated-encryption modes.

sjcl - Stanford Javascript Crypto Library

OpenPGP.js is a JavaScript implementation of the OpenPGP protocol. It aims to provide an Open Source OpenPGP library in JavaScript so it can be used on virtually every device. This does not require gpg on their machines in order to use the library. The idea is to implement all the needed OpenPGP functionality in a JavaScript library that can be reused in other projects that provide browser extensions or server applications. It should allow you to sign, encrypt, decrypt, and verify any kind of text - in particular e-mails - as well as managing keys. 

OpenPGP.js - OpenPGP implementation for JavaScript

Firefox Send lets you share files with end-to-end encryption and a link that automatically expires. This helps to keep your stuff private and make sure it does not stay online forever.

Firefox Send - Simple, private file sharing

RxDB is a realtime Database for the Web. It is reactive data-handling based on RxJS. It helps App to work even without internet. It supports Mango-Query, Encryption, Import/Export of database and lot more.

RxDB - A realtime Database for the Web

CyberChef is a simple, intuitive web app for carrying out all manner of "cyber" operations within a web browser. These operations include simple encoding like XOR or Base64, more complex encryption like AES, DES and Blowfish, creating binary and hexdumps, compression and decompression of data, calculating hashes and checksums, IPv6 and X.509 parsing, changing character encodings, and much more.
 
The tool is designed to enable both technical and non-technical analysts to manipulate data in complex ways without having to deal with complex tools or algorithms. It was conceived, designed, built and incrementally improved by an analyst in their 10% innovation time over several years.

CyberChef is a simple, intuitive web app for carrying out all manner of "cyber" operations within a web browser. These operations include simple encoding like XOR or Base64, more complex encryption like AES, DES and Blowfish, creating binary and hexdumps, compression and decompression of data, calculating hashes and checksums, IPv6 and X.509 parsing, changing character encodings, and much more.

CyberChef - The Cyber Swiss Army Knife for Developers (DevToolbox)

Enigmail is a security extension to Mozilla Thunderbird and Seamonkey. It enables you to write and receive email messages signed and/or encrypted with the OpenPGP standard. Sending and receiving encrypted and digitally signed email is simple using Enigmail. It supports powerful GUI for easy configuration and OpenPGP key management, Integrated OpenPGP PhotoID viewer and lot more.

Enigmail - A simple interface for OpenPGP email security

Tutanota automatically encrypts all your data on your device. Your emails as well as your contacts stay private. You can easily communicate with any of your friends end-to-end encrypted. Even subject and attachments as well as all your contacts are encrypted. It provides an open webmail service that is very easy to use.

Tutanota - Encrypted MailBox

CryptoJS is a growing collection of standard and secure cryptographic algorithms implemented in JavaScript using best practices and patterns. They are fast, and they have a consistent and simple interface.
CryptoJS supports MD5, SHA1, SHA256 algorithm for Hashing. It supports <span data-slate-fragment="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">Advanced Encryption Standard (AES), DES, Triple DES, Rabbit, RC4, RC4Drop.
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Crypto-js -  JavaScript library of crypto standards

A minimalist, opensource online pastebin where the server has zero knowledge of pasted data. Data is encrypted/decrypted in the browser using 256 bits AES. Data compressed and encrypted in the browser before sending to server. Server has zero knowledge of data being stored. Your data is safe even in case of server breach or seizure. 

sebsauvage-ZeroBin

Keygrip is a node.js module for signing and verifying data (such as cookies or URLs) through a rotating credential system, in which new server keys can be added and old ones removed regularly, without invalidating client credentials.

keygrip - Key signing and verification for rotated credentials 

Simple encrypted web chat. Powered by socket.io, the web cryptography API. This project is an example of how client side encryption works and how you can integrate it as a chat service. Darkwire server is a Node.js application that requires redis. The Darkwire.io web client is written in JavaScript with React JS and Redux. It uses a combination of asymmetric encryption (RSA-OAEP), symmetric session keys (AES-CBC) and signing keys (HMAC) for security.

Darkwire.io -  End-to-end encrypted instant web chat

This is EnvKey's cross-platform native application. It supports Mac, Windows, and Linux. EnvKey is an end-to-end encrypted secrets and configuration management tool. It keeps your configuration securely and automatically in sync for all your developers and servers.

EnvKey - Protect API keys and credentials, Keep configuration in sync everywhere.

ProtonMail provides secure email service. All emails are secured automatically with end-to-end encryption. This means even we cannot decrypt and read your emails. As a result, your encrypted emails cannot be shared with third parties.

ProtonMail - Web client for the ProtonMail secure email service

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