What are Encryption and Decryption?

What are Encryption and Decryption?
What are Encryption and Decryption?
  • What is Cryptography?
  • What is Encryption?
  • What is Decryption?
  • What Is the Purpose of Encryption and Decryption?
  • Why should you use them?
  • Keys of Encryption and Decryption
  • Applications of Encryption and Decryption
  • Difference

What is Cryptography?

Cryptography is a method of safeguarding and protecting data while it is being transmitted. It’s helpful for stopping unauthorised persons or groups from accessing sensitive data. Cryptography’s two most important functions are encryption and decryption. The technique of transforming a normal message (plaintext) into a meaningless message is known as encryption (Ciphertext). Whereas, Decryption is the technique of returning a meaningless communication (ciphertext) to its original form (Plaintext).

Let’s dive into what encryption and decryption really are:


Encryption is a means of encrypting data so that only authorised parties can decipher it. It is the task of converting human-readable plaintext to inexplicable format, also known as ciphertext.

Encryption, in a nutshell, alters readable data to make it appear random. Encryption requires the employment of a cryptographic key, which is a set of mathematical values agreed upon by both the sender and recipient of an encrypted message.

Although encrypted data appears to be random, it is encrypted in a logical, predictable fashion that allows a person that gets the encrypted data and has the relevant key to decrypt it and convert it back to plaintext.


Decryption is the process of reversing the encryption process so that the message’s content may be read and understood by the recipient. As long as the recipient has the right data encryption key, the process of transforming encrypted text into decrypted text is usually easy. This is also true when using data encryption on a picture or any other type of data.

The recipient of the communication may interpret the message and act on the new knowledge after the encrypted data has been decoded.

Decryption can be done manually, such as by manipulating the text or keys used by the message sender to encrypt their communication. It can also be done by a computer on its own.

Why are Encryption and Decryption needed?

Encryption scrambles the information of communication or file to make it more secure. You need the proper key to encrypt a message, and you also need the right key to decode it. It is the most effective method of concealing communication using encoded data, with the sender and recipient holding the key to decrypt data.

The notion is similar to youngsters inventing secret code words and other discrete ways of communicating in which only they can understand the message. Encryption is similar to conveying secret communications between parties; if someone attempts to pry without the appropriate keys, they will be unable to comprehend the message.

While encryption does not guarantee security, it can be used to safeguard a user’s identity and privacy. We can hide our data if we are ever monitored, mistakenly or not, by employing correctly configured encryption systems.

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Why use Encryption and Decryption?

Listed below are certain captivating reasons why you should use encryption:

  • Guards sensitive information such as passwords and login ids.
  • Assures that private information is kept private.
  • Benefit you in ensuring that the document or file you’re working with hasn’t been tampered with.
  • The encryption technique also shields IP and wards off plagiarism.
  • This is beneficial for network communication, where a hacker may easily get hold of unencrypted data.
  • It’s a crucial method as it securely safeguards data that you don’t want others to see.

The following are some gripping reasons why you should employ decryption:

  • It aids with the protection of sensitive information such as passwords and login IDs.
  • Ensures that private information is kept secret.
  • Abets you in securing the document or file you’re working from getting tampered with.
  • The encryption method also protects intellectual property and prevents plagiarism.
  • It’s useful for network communication, like the internet, where a hacker may get unencrypted data rapidly.
  • It’s an important strategy since it allows you to secure data that you don’t want others to see.

Keys of Encryption and Decryption

  • Symmetric Key: The same key is used for both encryption and decryption in symmetric key encryptions.
  • Asymmetric Key: Asymmetric key encryptions encrypt and decode using two independent sets of keys. Anyone can see the public key, but only the recipient has access to the private key.
  • Pre-Shared Key (PSK): In cryptography, a pre-shared key is a shared secret that was previously shared between two parties through a secure channel before being utilized.
  • Public Key Cryptography is a type of encryption that uses two pairs of keys to encrypt data. To encrypt messages for a receiver, public keys are utilized.
  • Private Key: A private key can be part of an asymmetric key pair that includes both public and private keys. Because the same key may be used to encrypt and decrypt data, it can be utilized in asymmetric encryption.

Applications of Encryption and Decryption

Encryption and decryption are essential for keeping data safe and secure. There are a number of internet programs that may assist you in encrypting and decrypting your data. Different encryption and decryption techniques are used by these programs, and you may pick one that best suits your needs.

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Digital Signatures/Authentication

Any method that demonstrates and verifies information is referred to as authentication. Sometimes it’s necessary to confirm a document’s origin, the sender’s identity, the time and date it was transmitted and/or signed, the identification of a machine or user, and so on.

Time Stamping

Time stamping is a method of proving that an electronic document or communication exists or was sent at a specific point in time. A blind signature system, which is a sort of cryptography, is used in time stamping. Blind signature techniques allow a sender to have a message acknowledged by another party without disclosing any information about the message.

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Electronic Money

The term “electronic money” is in the process of becoming defined. It refers to electronic transactions involving a net transfer of monies from one party to another, which can be debit or credit, anonymous or recognized, and can be debit or credit. There are hardware and software options available.

Encryption/Decryption in an email

Email encryption is a means of protecting the content of emails from anyone attempting to gain a participant’s information from outside the email discussion. In its encrypted state, an email can no longer be read by a person. Only your private email key can unlock and encrypt your emails back into the original message.

The technology of public-key cryptography is used to encrypt emails. Each email address is associated with a pair of keys, which are necessary to encrypt or decode an email. One of the keys is a “public key,” which is saved on a keyserver and linked to your name and email address. It may be viewed by anybody.

Encryption in WhatsApp

The signal protocol, which mixes asymmetric and symmetric key encryption approaches, is used by WhatsApp to encrypt data. The symmetric key cryptographic algorithms ensure secrecy and integrity, whereas the asymmetric key cryptographic algorithms help with authentication and non-repudiation, among other security aims. In symmetric-key cryptography, a single key is utilized for both data encryption and decryption. In asymmetric key cryptography, there would be two separate keys. Only a user’s private key can decrypt data encrypted with that user’s public key and vice versa.

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Encryption in Instagram

Instagram’s contact with you is almost certainly encrypted. When your phone requests data from Instagram, it will encrypt queries from Instagram servers using SSL/TLS over port 443 and deliver you data over the same encrypted data stream.

Sim card Authentication

Authentication To determine whether the SIM is allowed to access the network, it must be authenticated. A random number is generated by the operator and sent to the mobile device.

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Difference between Encryption and Decryption

  • What is?

It is the process of transforming readable data into unreadable data. It assists you in preventing unwanted data access.
It’s a technique for restoring unreadable/coded data to its original state.

  • Process

Whenever the data is sent between two separate machines, it is encrypted automatically using a secret key.
The receiver of the data automatically allows you to convert the data from the codes into its original form.

  • Where it takes place

The sender’s end – a person who is sending the data to the destination.
The receiver receives the data and converts it.

  • Major function

Transforming humanly understandable messages into an incomprehensible and obscure form that can not be interpreted.
It is a conversion of an obscure message into an understandable form that is easy to understand by a human.

  • Key used

Encryption is executed using a secret key or public key.
Decryption is executed using a secret key or private key.