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://github.com/weinholt/industria/.
There are old release tarballs available. New releases are on GitHub.
Industria is available under the MIT license. See the file LICENSE.txt for details.