Cryptography comes from the Greek word, which means kryptos and graphein.
Kryptos means secret or hidden, while graphein means writing.
So, in general, cryptography is the process of writing or conveying messages in a secret and hidden manner.

However, if we relate it to the use of digital technology, then cryptography is a discipline that studies the technique of encrypting the original text (plaintext) which is arranged randomly, by utilizing the encryption key so that the text changes into text that is difficult to read (ciphertext) by users who do not have the decryption key.

Furthermore, there is the term classical cryptography, which is a cryptographic technique that does not require computer assistance and usually uses pens, stones, paper, and other traditional tools.

Ref: sekawanmedia.co.id/