52_Embedded_System

##Embedded System : Autonomous encryption station

• Thomas Boulier
• Anthony Calpas
• Camille Finand
• Aurélien Jolivard
• Antoine Marck

###Fair practices : Use of git, autotools, the present README.

Setup :

• Cross-compil encrypt.c and decrypt.c for Armadeaus apf28.
• Have a device containing : encrypt, decrypt, mountKey.sh, possibly autoupdate.sh
• Have the daemon S99mount in /etc/init.d in the Armadeus.
• Boot the board.
• The LED should slowly blink : the board is in idle state.
• Plug the USB device.
• The daemon S99mount will launch mountKey.sh
• mountKey.sh will launch autoUpdate.sh and move encrypt & decrypt from the stick to the board.
• mountKey.sh will execute encrypt creating a file encrypted.xor from test
• mountKey.sh will execute decrypt creating a file decryptedFile from encrypted.xor
• The LED should quickly blink 3 times to indicate that the process achieved, then light off.
• You can unplug the stick.
• The board will then return in idle state, the LED should blink slowly again.

##Setup : (versions before 1.3)

• Create directory /be if it does not exist.
• Put mountKey.sh in it.
• Put binaries encrypt and decrypt in it
• Put daemon S99mount in /etc/init.d
• syncronize the RAM.

##Use:

• Boot.
• [Log]
• The LED should slowly blink : the board is in idle state.
• Plug the USB stick.
• The board will enter in busy state : it will mount the stick, encrypt the file called "XXX", then unmount the stick.
• The LED should quickly blink 3 times to indicate that the process achieved, then light off.
• You can unplug the stick.
• The board will then return in idle state, the LED should blink slowly again.

##State of the several version :

###0.1 Version:

• Script run by init.d which detect a USB device connected on the card (check /dev/sda1 periodically)
• Mounting the device.
• Unmounting the device.
• The LED flashes 3 times.

###0.2 Version:

• Every n secondes,a long flash of the LED for each check.

###0.2.1 Version: After the mounting-unmounting, the system return in the idle state.

###1.0 Version:

• Between mounting & unmounting, a encryption programm is called.

• The encryption is the XorEncryption (cf https://github.com/KyleBanks/XOREncryption/tree/master/C)

• The programm is a C programm, crosscompiled using https://github.com/pblottiere/armadeus, with make am28_defconfig

###1.1 Version:

• Decrypt the file "todecrypt.xor"

###1.2 Version:

• Encrypt the whole directory /be (unimplemented)

###1.3 Version:

• A bash autoupdate.sh on the device do the Setup process described higher.