What are the types of Decryption in Information Security?

A reverse process of encryption is known as Decryption. It is a procedure of transforming Cipher Text into Plain Text. Cryptography need the decryption technique at the receiver side to acquire the original message from non-readable message (Cipher Text).

Decryption operate by using the opposite conversion algorithm used to encode the information. The same key is needed to return the encrypted data to its initial state.

In decryption, the system extracts and transform the garbled information and change it to texts and images that are simply comprehensible not only by the reader but also by the system. Decryption can be accomplished manually or automatically. It can also be implemented with a set of keys or passwords.

Data can be encrypted to create it complex for someone to steal the data. Some companies also encrypt information for general protection of company information and trade secrets.

If this data required to be viewable, it can require decryption. If a decryption passcode or key is not accessible, special software can be needed to decrypt the information using algorithms to crack the decryption and create the data readable.

There are various types of decryption which are as follows −

Symmetric Decryption − In symmetric encryption, the same mathematical equation both encrypts and decrypts the information. The following example, a simple letter substitution cipher, including A=B, B=C, etc.

It is symmetrical because it can easily reverse the process to decrypt the message. If it can send a message using a symmetric encryption method, the recipients should also have the key to decrypt the file.

Asymmetric Decryption − Asymmetric decryption methods also known as public-key decryption. It can use a system including a set of connected keys. In this system, anything encoded with one key needed the other key to decrypt, etc.

When it can encrypt a message using someone’s public key, it can understand that only a recipient possessing the corresponding private key can read it.

Hashing − Hashing is a form of encryption that need a specialized one-way encryption key. If it can hash a given volume of information, it will create a unique output string to that data, but it is impossible to reconstruct the information from the output string. It can re-encode the original information and compare it to the result string to check it.

This can serve as a type of error correction in encoding. Hashing a message and supporting that value to the correspondents provides that they can hash the message themselves and compare the values. As long as the two output strings match, recipients understand the message is full and unaltered.