What is Encryption and Decryption?

You must have heard about Encryption before too, but do you know what is this encryption technically and how does it work etc. To implement sensitive information, a system needs both secrecy and privacy to implement. A system cannot prevent completely unauthorized access during transmission of media. Data tampering, in which intentional data is deliberately modified, through an unauthorised channel. This is not a new issue, nor is it unique to the computer era.

By changing the information, it can be protected from unauthorised access which only the authorized receiver can understand. The method that is used to do this thing is called encryption and decryption. The main difference between these two Encryption and Decryption is that the message can be converted into Encryption in a very unintelligible form which cannot be understood without decrypt. Decryption means the process by which the original message is recovered from encrypted data. So today I thought that why should you all be given complete information about what encryption is, so that you too have knowledge about this process. So let's start without delay.

Encryption is a process in which the sender converts the original message into an unintelligible form and then it is sent to another place through the network. In this, sender needs an encryption algorithm and a key so that it converts plaintext (original message) into ciphertext (encrypted message), this process is called enciphering.

A plaintext is data that is protected during transmission. This ciphertext is a type of scrambled text that produces an outcome-like encryption algorithm and for which a specific key is used. It is not ciphertext shielded. It only flows above the transmission channel. This encryption algorithm is a type of cryptographic algorithm that takes plain text and an encryption key at the top of the input and produces a ciphertext in the output.

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While talking about traditional encryption methods, both encryption and decryption keys are the same and secret too. These conventional methods are broadly divided into two classes: Character level encryption and Bit level Encryption.

Character-level Encryption - In this method, encryption is performed in the character level. Two common strategies used for Character Level Encryption are Substitutional and Transpositional.
Bit-level Encryption - In this method, first data (such as text, graphics, audio, video, etc.) is divided into blocks of bits, then they are modified with many techniques such as encoding / decoding. , permutation, substitution, exclusive OR, rotation, etc.

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