Building Hermes # You need to start with installing the libraries and utilities that we’re going to need. For Debian the command is: sudo apt-get update && sudo apt-get install build-essential libssl-dev git We need build-essential for building binary libraries and libssl-dev as backend for Themis. Let’s download and install Themis into your system: git clone https://github.com/cossacklabs/themis cd themis make && sudo make install cd .. Now you should download and install Hermes-core: