Security 2 Mod is a special and creative mod which was created by Dr Lazuli.It is about security in Minecraft PE.This mod adds some new blocks which can be used to help you safer.For example, you can set the keyboard to make certain areas can only be accessed by players with a certain degree of liberation.I will introduce you all new blocks.

.Keypad Block will transmit a signal when activated. Another common use is to put it next to a metal door. Then tap on the keyboard Block to set a password (a number).
Key Card Block will transmit a Redstone signal if it’s triggered. It can only be triggered by someone who uses a Key Card which has the same passcode which the Key Card Block is set to use.
The Barrier Block Activator can disable/enable barrier blocks.
Place a Chest Lock block next to a chest. Tap on the block to lock or unlock the chest. The chest can only be opened as long as the Chest Lock is disabled.

Items IDs and crafting recipes:

Keypad Block (236) – 7 iron ingots + 1 redstone + 1 paper
Key Card (620) – 3 iron ingots + 1 redstone + 5 papers
Key Card Block (237) – 7 iron ingots + 1 emerald + 1 paper
Barrier Block Activator (238) – 6 iron ingots + 1 glowstone dust + 1 redstone + 1 glass block
Barrier Block (239) – 8 obsidians + 1 redstone
Barrier Block Zero (240) – 6 iron ingots
Chest Lock (241) – 4 iron ingots + 1 redstone + 4 gold ingots