🌍Cryptography Episode 1: Basic Some Terms

We've heard the name of the Clash of Clans game. Once the key is to play this game, the head of the people has become completely bad. Then they started playing Clash of Clans in Real Life. Now, in the city of Dhaka, the screw-laden clerk leader Sakhalin Bai. So now he wants to send his co-leader Shakib by-night to Jatrabari, to send a news that he will rest in Uttara area tonight, he will attack in the morning tomorrow at Mirpur, the head of the clan leader Nahid Bai's house.

Now Harry Potter paw is the only means of communication. He went to sleep in the nose with mustard oil and hung a pancake. Meanwhile, Nahid said that after taking the pimchatake magic, he came to know about the position of Sakhalin. What's next, before the morning, the sleeping forces attacked the forces ...

So Shakib's heart is very bad after hearing this. He thought it was not safe to give a letter in this way. He should take such action so that the enemy can not read it even if the letter falls in the enemy's hand. That's why he made a new rule to send a letter. He told all the members of his clan that all the letters from now on will be written in the opposite. That is, if someone wants to tell, "the hand is broken, it will be okay. Pray for me. "Then he will write" em rof yarP. It's hard, it's hard to believe. "

Now only people in his clan know that the letter will be read from the opposite side. The enemies do not know, so can not read the letter.

Here's what Shakib did, the encryption. After getting the letter, the rest will do the decryption. And to understand that "the letter must be read from the opposite side" - this is the key key (key), which will be sent only to the data sent and sent to the person.

Let's learn the bookish definitions!

Plain Text: The data that can be read as plain, plain text. For example, "the hand is broken, it will be okay. Pray for me. "

Encryption: The cryptographic transformation of the plain text is an encryption.

Cipher Text: The cryptic text that can be found in encryption.

Decryption: Decryption is the process of bringing the cipher text back to plain text.

But the example we gave was, it is a very weak encryption. Because it can be decrypted if you give it to a younger sister in class 2. And compared to that, Nahid is a great Cuban skilled in magic tanera!

Cryptography

(In the branch of science) Data is encrypted and decrypted with the help of math, so cryptography. The use of cryptography is now widely spread. Important information (Data Entitlement Information) is stored and sent in different ways (such as the Internet) from one place to another, cryptography is used in all cases, so that un-authorized someone can not understand it.

On the other hand, cryptanalysis is the science to break the cycle by analyzing the circulation! This is mostly unlawful.

And the sum of these two sciences is cryptology.

How it works

The key weapon of cryptography is a cryptographic algorithm or cipher, by which data is encrypted, or encrypted data is decrypted. It's basically a mathematical function. This algorithm works with a key. It's a word, number, or phrase to have this key. The same plain text will be converted to different cipher texts with different keys.

The security of encrypted data depends on two things:

(1) The power of cryptographic algorithm

(2) Key Security

Traditionally, both encryption and decryption are done through the same key.

This is the end of the episode with the introduction of some basic terms. In the next phase we will know about the evolution of cryptography!