Cryptography (Part-1) Definition and History

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Cryptography (Part-1) Definition and History

In the beginning, I will give some detailed and basic knowledge about cryptography, and we use this cryptography a lot in our real life, but many people did not know that it is called cryptography.

What is Cryptography?

Cryptography is also called Cryptology. The same thing, later explains how the two are the same.

Hiding information does not make it completely secure, it needs to be hidden to make it even more secure. Here hidden and the secret is different. Hidden means hiding from the 3rd eye, but hidden means the 3rd eye can't even see it. That is a person from whom you want to hide information, even if he sees your information, will not be able to understand or read it.

(I don't know any definition of one line, I just wrote what I understand)

Generally, cryptography is used in the English language, Bengali can also be used which is comparatively more difficult and time-consuming.


Suppose I am jealous of age or situation where there is no internet or any device. I have to write it down on paper and reach it from one person to another. Now, I want to say to my friend Saif that "There is 1M taka in a box in the small room".

But if I write it down and send it to Saif, then everyone will know. So what I will do is write on paper -

“Uifsf jt 2N ublb jo b cpy jo uif tnbmm sppn”

Now read it and tell me what you understand?

I'm sure you know what I've done by reading the 2 posts. Yes, I moved all characters forward by 1 digit. that is,

Substitute b for a

Substitute c for b

Substitute d for c

e instead of d

I wrote f instead of e.

This is how see There=Uifsf.

This is cryptography. Isn't it funny?

I really enjoy cryptography. This example is the most basic example of cryptography. If I had put 1 there instead of 2, would you have caught it in an instant? No, you had to observe for a long time. So think, even at the most basic level cryptography is increasing your brain power, how much brain will you have to use when you go to the advanced level.

(I will teach more in the next episode. Today I will only discuss history.)

Where did this word come from?

The term Cryptography or Cryptology comes from the ancient Greek words “kryptós” and “graphein” or “kryptós” and “logia”.

here, Kryptós means Hidden Secret, Graphein means To write, and Logia means study.

Cryptography and Cryptology are different in meaning from a normal point of view (writing hidden secret information and reading hidden secret information) but the two resemble the same thing, "secret information", so it is called Bhagwan Gupta Vidya in Bengali to eliminate this confusion, which It means both reading and writing.

Anyone who does cryptography must be able to do cryptology. If one can do the other, it is considered together rather than separately.

What is its history?

Researchers have no exact information as to who first invented cryptography. Because the written and pictorial language was introduced thousands of years ago.

However, the one name that most research on is "hieroglyphic". Historians claim that he was the first to use cryptography in images and it was about

4JUdGzvrMFDWrUUwY3toJATSeNwjn54LkCnKBPRzDuhzi5vSepHfUckJNxRL2gjkNrSqtCoRUrEDAgRwsQvVCjZbRyFTLRNyDmT1a1boZVabout 2000 years ago. 

He uses it to hide his conversations with his security forces.

It is also most commonly used in Greek civilization. To conceal information in Greek civilization, messengers (those who sent messages) were given a fake letter and their heads were shaved the information was written with a heat marker and the information was sent when the new hair grew back.

It is also spread in India. 2 types of ciphers were also used in "Kamasutra" written by "Mallnag Vatsyayana" about 2000 years old.

According to Muslim writer “Ibn Al Nadim” also in “Sasyanid” reign two types of the script were used one “Shah Dabririya” and another “Raj Shaharia”.

Cryptography was used in many such periods and kingdoms, I don't know them all. But even if I write all the things I have in mind, it will be 2 more episodes. You can take the help of the internet or books to know the details.

However, cryptography's greatest popularity worldwide came from its use in World War II. whatever, it was also used in the First World War.

In World War I, rotor machines were used to hide information.

And in World War II, Hitler used the Colossus computer to create and use cryptographic codes

However, so far today.

Finally, I left a movie for you.

(The Da Vinci Code)

One of the world's bestselling books is "The Da Vinci Code", this movie was made based on this novel.

This movie is about cryptography. Hope you enjoy it.

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