Encryption works by using keys to scramble and unscramble data during transmission. Symmetric key encryption uses a single secret key shared between computers, while public key encryption uses two keys - a private key known only to the sending computer and a public key given to computers wanting secure communication. Common encryption protocols like SSL and TLS allow sensitive information to be securely transmitted on the internet by authenticating users and encrypting data between web browsers and servers.

1. How Encryption Works
s1170008 Yuya Otsuka

2. 1. Introduction to How Encryption
Works
The incredible growth of the Internet has
excited businesses and consumers alike with its
promise of changing the way we live and work.
It's extremely easy to buy and sell goods all
over the world while sitting in front of a laptop.
But security is a major concern on the Internet,
especially when you're using it to send sensitive
information between parties.

3. 2. Security Encryption Systems
Computer encryption is based on the science of
cryptography, which has been used as long as
humans have wanted to keep information secret.
A Greek used a code first.

4. 3. Symmetric Key
In symmetric-key encryption, each computer has
a secret key (code) that it can use to encrypt a
packet of information before it is sent over the
network to another computer.

5. 4. Public Key Encryption
Also known as asymmetric-key encryption, public-
key encryption uses two different keys at once -- a
combination of a private key and a public key.
The private key is known only to your computer,
while the public key is given by your computer to
any computer that wants to communicate securely
with it.

6. 5. SSL and TLS
● SSL(Secure Sockets Layer)
● TLS(Transport Layer Security)
Originally developed by Netscape, SSL is an
Internet security protocol used by Internet
browsers and Web servers to transmit sensitive
information.

7. 6. Authentication
Basically, if information is "authentic," you know
who created it and you know that it has not been
altered in any way since that person created it.