Industria is a collection of portable R6RS Scheme libraries for cryptography. It implements low-level algorithms like AES, RSA, DSA, ECDSA, etc and high-level protocols such as OpenPGP, Off-The-Record messaging, DNS and Secure Shell (SSH).
The current homepage is https://gitlab.com/weinholt/industria/.
The Industria manual (PDF) is available online.
There are old release tarballs available. New releases are on GitLab and Akku.scm.
Industria is available under the MIT license. See the file LICENSE.txt for details.