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Gpg4win (GNU Privacy Guard for Windows) is encryption software for files and emails. Gpg4win supports both relevant cryptography standards, OpenPGP and S/MIME (X.509), and is the official GnuPG distribution for Windows. It is maintained by the developers of GnuPG.
This project is devoted to provide a simple software layer for digital signature, when an hardware cryptographic token is required. The default implementation tries to comply as strictly as possible with the italian law digital signature directives.
OpenSignature is an open source project for the digital signature of documents. It works with all cards supported by OpenSC and focuses on adding support for cards from accredited Italian CAs. The goal of the project is to provide a first single product
cryptlib is a powerful security toolkit that allows even inexperienced crypto programmers to easily add encryption and authentication services to their software. It provides support for S/MIME and PGP/OpenPGP secure enveloping, SSL/TLS and SSH secure sessions, CA services such as CMP, SCEP, RTCS, and OCSP, and other security operations such as secure timestamping.
Charm is a framework for rapidly prototyping advanced cryptosystems. Based on the Python language, it was designed from the ground up to minimize development time and code complexity while promoting the reuse of components. It supports Base crypto library, including symmetric encryption schemes, hash functions, PRNGs, digital signature, encryption and lot more.
OpenSC provides a set of libraries and utilities to work with smart cards. Its main focus is on cards that support cryptographic operations and facilitate their use in security applications such as authentication, mail encryption and digital signatures. OpenSC implements the PKCS11 API so applications supporting this API (such as Mozilla Firefox and Thunderbird) can use it. On the card OpenSC implements the PKCS15 standard and aims to be compatible with every software/card that supports it.