Distance Vector and Link State Difference?

I go through Quora when I'm trying to waste some time. One day i stumbled across this Interesting Question on it however. 

This Specimen was asking what the Difference between is between link state routing and distance vector routing.

Saw few answers there which are really in-dept and feels pretty overwhelming to read if you are just
getting into networking. However, i had a simple and brief answer for it.

Link to if you want to read rest of the Answers.

Cipher and Keys

A Cipher can also be called as an Algorithm about how to perform encryption and Decryption.

There are multiple methods how it can be done few of them are

Substitution – This uses different letter for a particular letter. meaning.

 'A' could be 'X'

(A is Cipherd to be X)

Poly alphabetic – This uses multiple letter for a particular letter (alphabet) Like for Example 

‘A’ – ‘DCE’
(A is cipher and is DCE)

Transposition – This rearranges the letters in different form

Example - “This is Secret”

T S S R

H I E E

I S C T

(It's just jumbling of words)

What’s keys then?

Keys are somethings that are used to decry-pt these cipher Encryption.Which has be to know to both the Receiver and the Provider of the packet.

A one-time pad (OTP) is a good example of a key that is only used once.
if we want to encrypt a 32-bit message, we use a 32-bit key, also called the pad, which is
used one time only. The key in this case is the one-time use pad. The pad must also be known by the receiver if he wants to
decrypt the message.