Open Source C# Cryptography Software

ActiveLock is an open-source copy protection, software licensing framework for all development enviroments supporting COM+ architecture. Core DLL available in VB2008 and VB6. Samples in C++, C#, Excel/Access VBA and keygens in PHP, ASP.NET available.

The PKI Framework (PKIF) is a cross-platform library for performing PKIX-compliant certificate processing. It includes support for SCVP, OCSP, CMS and Timestamps. It uses Windows CAPI, NSS or Crypto++ for cryptographic services and hardware support.

Formerly known as DotNetOpenId, this library brings easy and flexible OpenID, OAuth and InfoCard to the .NET platform. Official web site is at http://www.dotnetopenauth.net/, which includes source code downloads.

OW.NET -- 1-Wire API port from Java (and J#) to C#. Use the Dallas 1-Wire and iButton chips with standard C# using a serial adapter (also CF.net) or the TMEX drivers on the Windows platform. No J# distribution installation required.

Hasher is a .NET class library to help programmers implement standard hashing and checksum algorithms into their own software. Written entirely in C#, Hasher providers a uniform interface to easily use any of the algorithms contained within this library

AceJudge is a system for managing programming contests. AceJudge's basic features include automatic judging of submitted programs, answering to clarification questions about problem descriptions, reevaluation of programs, real time ranking etc.

Adapdev.NET is an enterprise framework that builds on the Microsoft.NET framework, providing enhanced components for object caching, database access and querying, code generation, unit testing and encryption, among others.

Paranoia Text Encryption mantiene SMS, correos, mensajes de redes sociales, notas y cualquier otro texto a salvo de ladrones, hackers y fisgones. Basta con pegar texto copiado desde cualquier aplicación, o guardarlo en un archivo para usarlo más adelante. Paranoia Text Encryption keeps SMS, mails, messages from social networks, notes and any other text safe from thieves, hackers and snoopers. Simply paste text copied from any application, or save it in a file, use it more later

Crypto.Net is a free and open cryptography library for C# and .Net. AES (Rijndeal), Twofish, Blowfish, RSA, Diffie-Hellman, SSL/TLS, X509-Certificate builder, stream cipher modes or a secure netowrk stream are only some features of this library.

This library exposes security functionality to the programmer, such as random number generation, hashing, salted hashing, message authentication code, symmetric encryption, asymmetric encryption, hybrid encryption, digital signature and in-memory protection. The library is accompanied by a sophisticated reference implementation, that demonstrates how to make use of the CryptoLibrary.

An enhanced and smaller version of Cryptography Application Block from Microsoft patterns & practices Enterprise Library 2.0.

A random number generator based on data from human interface devices. A trayicon that provides access to the generated data in various data ouput formats: Guids, Passwords, Files etc. Future goal is build-in P2P exchange of gathered data.

This project provides stable releases of Pkcs11Interop project hosted on github. Please visit project website - www.pkcs11interop.net - for more information.

RainDoll aims to be an implementation of a symmetric-encryption utility for desktop users written in C#/.NET and Windows Forms with two goals: security and simplicity. It uses cryptographic standards for security, and has a smart, compact interface.

This command-line utility produces a report of file information including version information where available. The reports can be useful for release information, manifests, and integrity verification.

A library for reading and removing DRM schemes from eBooks. The one and only purpose of said library is providing the ability to access the content of legally obtained eBook under conditions of DRM management server failure.

"mASN1" - mini ASN.1 framework is a light ASN.1 framework written in C# for .NET framework. It can be used for creating classes that model ASN.1 types and are capable of encoding/decoding themselves to BER/DER codes. PER support is planned.