The Update Framework is described as '(TUF) helps developers maintain the security of software update systems, providing protection even against attackers that compromise the repository or signing keys' and is an app in the Development category. There are 2 alternatives to The Update Framework for a variety of platforms, including GnuPG, Linux, Mac, Microsoft Office Outlook and OpenPGP. The best alternative is GnuPG, which is both free and 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.