crypto-dm-modules-3.2.0-4-iop3 software package provides devicemapper crypto module, you can install in your Debian 7 (Wheezy) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install crypto-dm-modules-3.2.0-4-iop3
crypto-dm-modules-3.2.0-4-iop3 is installed in your system.
Make ensure the crypto-dm-modules-3.2.0-4-iop3 package were installed using the commands given below,
$ sudo dpkg-query -l | grep crypto-dm-modules-3.2.0-4-iop3*
You will get with crypto-dm-modules-3.2.0-4-iop3 package name, version, architecture and description in a table
| Distro | Debian 7 wheezy |
| Section | debian-installer udeb packages |
| Package | crypto-dm-modules-3.2.0-4-iop3 |
| Version | 3.2.78-1 |
| Description | devicemapper crypto module |
| Sub Section | Debian-installer |