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How does data encryption and decryption work?

 Data Encryption & Decryption 

Data Encryption: Data encryption is to keep data safe from the use of unauthorized persons/organizations. Encrypted data usually prevents unauthorized persons/institutions from accessing the data. The source or sender of the data encrypts the data using specific codes. When the data reaches the destination or recipient, the data has to be decrypted before use. In this case, the sender has to inform the Encrypt rule or the Decrypt rule to the recipient. The original message is changed by decrypting the encrypted data using the same method or algorithm.


Different methods of data encryption:

There are various types of data encryption rules in use, viz

(i) Caesar Code and

(ii) Data encryption standards.

The Caesar code has been used to encrypt data since the time of Roman Emperor Julius Caesar. The Data Encryption Standard-DES invented by the American National Bureau of Standard NBS is the most widely used encryption method.

The method of encrypting data is discussed below: Suppose, the data is to be encrypted in such a way that each character. The user will not understand the actual data. such as

Actual/original data B A

Encrypted data

CBNGLAQN

is replaced by the next character. As a result, any common

DWES↓THZV


Here 'B' is replaced by its next letter 'C', 'A' by its next letter 'B', N by its next letter 'O'. An authorized person or organization can decrypt and read the original data according to the encryption method.


Plaintext

Recipient

Decrypt

Different keys are used to encrypt and decrypt messages

Recipient's Public

Recipient's Private


Role of data encryption in data security:

The main function of data encryption is to keep data safe from use by unauthorized individuals or organizations. Encrypted data usually prevents unauthorized persons/institutions from accessing the data. The source or sender encrypts the data using a specified code. When the data reaches the destination or recipient, the data has to be decrypted before use. As a result, data security can be ensured.

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