The document discusses different methods of securing data transmission including firewalls, VPNs, and encryption. It explains that firewalls control communication between networks to maintain security, and VPNs allow using public lines securely by protecting and strictly managing data with authentication and encryption. Encryption involves converting data into code that can only be read with special knowledge, making it difficult to decipher without the proper means even if seen.

1. How Encryption for Strong
Security Works
1; Fire wall
2; About VPN
3; About Film ware
4; Encryption s1170117 Fumiya Nagashima
s1170138 Kentaro Okawa
s1170139 Yoshihide Okazaki
s1170143 Ryo Kawamukai

2. Fire wall
Fire wall is aimed software
or hardware as for the
control of the
communication
between a certain specific
computer network and the
outside, and the
maintenance
of the safety of an internal
computer network.

3. About VPN
The service that can use a
public line with VPN as if it
is a dedicated line.
Because data is protected
and managed strictly by the
attestation and the
encryption, the dangers
such as the leakages and
tapping are low.

4. About Firmware
Firmware is equipment written
software to control hardware.
Moreover, Firmware
is not only software but also circuit
information using the programmable
logic device in a wide sense.
Firmware is built into a lot of things.
For example, re
mote controls, calculators, through
computer parts and devices like hard
disks, keyboards, etc.

5. Encryption
The encryption is a
notation converted to
read with special
knowledge,even if it is
seen,it is not possible to
decipher it easily.
Encryption has three
kinds that are called the
code, steganography,
and cipher.

6. Reference
Wikipedia
http://ja.wikipedia.org/wiki/%E3%83%A1%E3%82%A
4%E3%83%B3%E3%83%9A%E3%83%BC%E3%82
%B8
It glosarry
http://e-words.jp/