Install ruby-rbnacl by entering the following commands in the terminal:
sudo apt update sudo apt install ruby-rbnacl
Description:
Ruby binding to the Networking and Cryptography (NaCl) library
The Networking and Cryptography (NaCl) library provides a high-level toolkit for building cryptographic systems and protocols
Homepage: https://github.com/cryptosphere/rbnacl
Version: 5.0.0-3
Section: universe/ruby