These two molecules code and decode.

Now the reason we say that these are symmetric ciphers is that both the encrypter and decrypter actually use the same key K. As we'll see later in the course, there are ciphers where the encrypter uses one key and the decrypter uses a different key.

Cryptography is a really fun topic it's all about making and breaking puzzles.

KGpg will now launch the key generation dialog to create your own key pair for encryption and decryption.

The decryption key performs the inverse or undo operation, which was applied by the encryption key.

Encryption

Encryption keys

Encoding

Encryption

Default encoding

Default encoding

Unknown Encryption

Cipher Wizard

Set Encoding

Encryption method

Encryption

Encryption Method

Decrypt

Encryption failed.

Decrypt

Vigener cipher. And in fact, decryption is just as easy as encryption.

So in a symmetric encryption system, basically, the two parties,

Current default encoder

Current

Name of the encoder

Current default encoder

Encoder priority

Use protocol encryption

Chiasmus Decryption Error

Chiasmus Encryption Error

Keep Encryption

Any Status

Always encrypt to self

Encryption State Icon

New mail arrived

Processed

Out of office reply active

Always encrypt with

Decrypt Save

Do not decrypt

Confirm Decrypt

Working on cipher, huh?

The decoding machine, Lektor.

But we can also look at an Enigma machine from the Nazis in World War II that was a coding and decoding machine.

In this class we're going to learn about some of the foundations of cryptography and we're also going to learn to use cryptography to solve problems in computing,