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apt-get install -t strech-backports python3-nacl
PyNaCl is a Python binding to libsodium, which is a fork of the Networking and Cryptography library. These libraries have a stated goal of improving usability, security and speed. It supports Python 2.7 and 3.4+ as well as PyPy 2.6+.
Features
Digital signatures
Secret-key encryption
Public-key encryption
Hashing and message authentication
Password based key derivation and password hashing