• Subrata Mandal
• Aniket Kumar Singh

Encryption is a technique that is used to convert original information, also called plain text, into unreadable ciphertext. This is done with the help of an encryption algorithm and key. It is meant to keep the original information secured from the wrong recipient. So only the right recipient can read the information by decrypting it using the decryption algorithm and key. Throughout history, encryption has been used to transfer secret information in the military. The most famous one is Caesar cipher. This method is named after Julius Cease, it was a very basic encryption technique, and it is a substitution cipher, in which letters were replaced by shifting by a fixed number. But nowadays encryption technique has advanced.

AES, DES, RSA, QKD

"The Era of Encryption - An Overview", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.8, Issue 4, page no.1341-1345, April-2021, Available :http://www.jetir.org/papers/JETIR2104384.pdf

"The Era of Encryption - An Overview", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.8, Issue 4, page no. pp1341-1345, April-2021, Available at : http://www.jetir.org/papers/JETIR2104384.pdf