Minisign is described as 'dead simple tool to sign files and verify signatures'. There are four alternatives to Minisign for a variety of platforms, including Linux, Mac, Windows, Windows Mobile and Windows Phone. The best alternative is GnuPG, which is both free and Open Source. Other great apps like Minisign are GPG4Win (Free, Open Source), Kryptor (Free, Open Source) and OpenPGP (Free, Open Source).
GnuPG allows to encrypt and sign your data and communication, features a versatile key management system as well as access modules for all kinds of public key directories. GnuPG, also known as GPG, is a command line tool with features for easy integration with other applications.
Gpg4win enables users to securely transport emails and files with the help of encryption and digital signatures. Encryption protects the contents against an unwanted party reading it. Digital signatures make sure that it was not modified and comes from a specific sender.
OpenPGP is the most widely used email encryption standard. It is defined by the OpenPGP Working Group of the Internet Engineering Task Force (IETF) as a Proposed Standard in RFC 4880. OpenPGP was originally derived from the .