cryfs software package provides encrypt your files and store them in the cloud, you can install in your Debian 9 (Stretch) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install cryfs
cryfs is installed in your system.
Make ensure the cryfs package were installed using the commands given below,
$ sudo dpkg-query -l | grep cryfs *
You will get with cryfs package name, version, architecture and description in a table
| Distro | Debian 9 stretch |
| Section | Utilities |
| Package | cryfs |
| Version | 0.9.6-1 |
| Description | encrypt your files and store them in the cloud |
| Sub Section | Utils |