Binary Bomb!!!! BOOMMM!!!!

BINARY BOMB - A BOOM at each phase!

A "binary bomb" is a Linux executable C program that consists of six "phases." Each phase expects the user to enter a particular string on stdin. If the user enters the expected string, then that phase
is "defused." Otherwise the bomb "explodes" by printing "BOOM!!!".
The goal is to defuse as many phases as possible without defusing the bomb.

Each bomb phase tests a different aspect of machine language programs:
  Phase 1: string comparison
  Phase 2: loops
  Phase 3: conditionals/switches
  Phase 4: recursive calls and the stack discipline
  Phase 5: pointers
  Phase 6: linked lists/pointers/structs

There is also a "secret phase" that only appears if students append a certain string to the solution to Phase 4. 

Each user gets a unique bomb that they must solve themselves.  The unique
solution to each bomb is available to the instructor.

Catch the source code at Binary Labs: CMU Binary Bomb

Disk encryption installation of ArchLinux.

ArchLinux - System Encryption with a keyfile on a external flashdrive/CD/USB:

Script for the arch-linux - full system encryption with a keyfile on a external drive.

#!/bin/bash

modprobe dm_mod

cryptsetup -c aes-xts-plain -s 512 luksFormat /dev/sda2 /mnt/USB/keyfile.jpg

cryptsetup -d /mnt/USB/keyfile.jpg luksOpen /dev/sda2 rootcrypt

mkfs -t ext4 /dev/mapper/rootcrypt

mkfs -t ext4 /dev/sda1

mkdir /mnt/boot

mount /dev/sda1 /mnt/boot

mount /dev/mapper/rootcrypt /mnt

pacstrap -i /mnt base base-devel

genfstab -p /mnt > /mnt/etc/fstab

arch-chroot /mnt

bash

cd //boot

pacman -S syslinux

nano /etc/syslinux/syslinux.cfg

//append the keyfile path//

cryptdevice=/dev/sda2:rootcrypt root=/dev/mapper/rootcrypt ro cryptkey=/dev/disk/by-label/USB:vfat:keyfile.jpg

nano /etc/mkinitcpio.conf

//add encrypt hook //

MODULES="dm_mod vfat ext4"

HOOKS=base udev block autodetect encrypt filesystems

//Save the file and exit//

syslinux-install_update -i

syslinux-install_update -a

syslinux-install_update -m

nano /etc/hostname

passwd

ln -s /usr/share/zoneinfo/America/New_York /etc/localtime

nano /etc/locale.gen

LANG="en_US.UTF-8"

//Save and exit the file//

nano /etc/locale.conf

//Uncomment the en_US.UTF-8 line//

//Save and exit the file//

exit

exit

mkinitcpio -p linux

umount /dev/sda1

reboot