Cryptography is a branch of computer science that studies the various ways in which information can be hidden.
Intelligence is the practice and discussion of secure communication methods in the presence of a third party.
The presence of modern intelligence is noticeable in various fields of mathematics, computer science and electrical engineering. There are practical applications of intelligence in the case of ATM cards, computer passwords, electronic commerce or e-commerce.
Examples of cryptography:
A: Suppose you have a message like “I LOVE YOU”.
If you want to send it to someone you like, then you tactfully reverse the message and send "L OLNH BRX". Or reverse "XЯᙠ HИ⅃O ⅃" sent it that no one will understand.
Thus sent to him. Because if someone else sees the straight message, it may be ruined. Now, everyone saw that message but no one understood anything because the message was sent in ha-ya-ba-ra-l or scribble. But the person to whom he sent it understood exactly how the message had been reversed. Sometimes someone he knew took the letter, but he didn't understand. : P How funny Taina !!
Let's find out the definitions!
Plain text: Plain text is the data that can be read automatically. For example, "I LOVE YOU."
Encryption: Encryption is the process of making plain text look incomprehensible.
Cipher Text: The obscure text that results from encryption.
Decryption: The process of bringing cipher text back to plain text is called decryption.
Procedure for cryptography:
Cryptography is used in all cases to store important information (data aggregation is information) and transmitted it from one place to another in different ways (e.g., internet) so that no unauthorized person can understand it.
On the other hand, cryptanalysis is the science of analyzing secure communication and breaking it! It is illegal in most cases.
And the sum of these two sciences is cryptology.
The main weapon of cryptography is a cryptographic algorithm or cipher, by which data is encrypted, or encrypted data is decrypted. It is basically a mathematical function. This algorithm works with a key. This key is a word, number or phrase. The same plain text will be converted to different cipher text with different keys.
The security of encrypted data depends on two things:
(1) The power of cryptographic algorithms
(2) Key security
Traditionally, both encryption and decryption are done with the same key.
Some movie names for those interested in cryptography:
"The Imitation Game"
"The Vinci Code"
You can watch these two movies. Interest will increase and you will be able to see the functions of cryptography with your own eyes in the big battles.