Encryption systems have evolved over time to securely transmit information. The Greeks first developed codes using letter and number substitutions or transpositions, while modern computers now use symmetric and public key encryption. Symmetric key encryption relies on both computers having the same key, while public key encryption uses separate private and public keys to encode and decode messages securely. Popular implementations of public key encryption include Secure Sockets Layer (SSL) and Transport Layer Security (TLS), which make use of certificate authorities to verify identities and encrypt web browser traffic. Hashing algorithms also play a key role by generating unique hash values from input data that cannot be traced back to the original.

1. Encryption
The Encryption Works

2. Security Encryption Systems
The computer think people save security. The humans have
wanted to keep information secret.The Greeks made specific
codes that involve substitutions or transpositions of letters and
numbers. The computers are using it.

3. Symmetric Key
Spartan generals sending messages is send to each other,
computers using symmetric-key encryption to send information
between each other must have the same key.Symmetric-key
encryption is a secret code that each of the two computers
must know to decode the information. The code provides the
key to decoding the message.

4. Public Key Encryption
public-key encryption uses two different keys at once. 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. To decode an
message, a computer must use the public key, provided by the
originating computer, and its own private key.

5. SSL and TLS
The popular implementation of public-key encryption is the
Secure Sockets Layer (SSL). SSL has become part of an
overall security protocol is Transport Layer Security (TLS). TLS
and its predecessor SSL make use of certificate authorities.
Once your browser requests a secure page and adds "http,".
The browser sends out the public key and checking.

6. Hashing Algorithm
The key in public-key encryption is made a hash value. This is
a value that is computed from a base input number algorithm.
The hash value is a summary of the original value. The
important thing about a hash value is that it is nearly
impossible. Original input number used to create the hash
value.