Math & Beyond

What is Coding and Decoding? Cryptography and its Benefits


08 January 2021

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What are coding and decoding?

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If, for example, in the classroom, the teacher has to teach something when the students get bored. Among them are two students who plan to go outside, but they are sitting in different seats. Still, they wanted to escape, so one student wrote some special symbols (secret message) on a piece of paper and passed it on to his friend.

Even if a teacher notices that paper, they cannot recognize the message. And just like we are using codes, ciphers in the military, to keep the information confidential, the kids also use some passcode to alternate words in order to communicate something.


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What is Coding and Decoding? Cryptography and its Benefit

Coding is a process used to encrypt a word, a number in a particular code or pattern based on some set of rules. Decoding is a process to decrypt the pattern into its original form from the given codes.

What is Coding and Decoding? Cryptography and its Benefits are mentioned below in the Downloadable PDF. 

📥 What is Coding and Decoding? Cryptography and its Benefits


What is Encryption in Coding?

In cryptography, Encryption is the procedure of transforming the plain text such as integers, characters, and special characters encoded data into ciphertext such as illogical (not readable format) is called Encryption.

What is Plaintext?

The plaintext is the entry-point (input) of the encryption and exit-point (output) of the decryption. The plaintext consists of all mix-up messages; it is in the form of text (alphabets) and is easily readable by humans.  Plaintext should work on the encryption algorithm. 

Example: Ramu has sent a “Hello” Message to Raghu.


What is Decryption in Decoding?

In cryptography, Decryption is the process of conversion of ciphertext that is a meaningless word into a readable original format to plaintext is called Decryption.

What is Ciphertext?

The ciphertext is an encrypted text or messages transformed from plaintext and makes use of encryption algorithms. And ciphertext consists of messages unreadable by humans and computers by using the plain text (decrypt) it can be converted into readable form, make use of a decryption cipher algorithm to convert the ciphertext into plaintext.

Example: The receiver Raju has received Ramu’s message “Hello” 

block diagram of cipher text

The process of encryption and decryption contains two keys:


The symmetric algorithm is useful for cryptography, encryption of the plaintext, and decryption of ciphertext. In that symmetric-keys are uniform and the transformation which is done in between the two keys (public-keys) are the same.

use of public key in the block diagram of encryption and decryption 


Public-key cryptography uses two pairs of keys one is private-key and the other public-key. Private-key is accessible only by the owner. And the public-key is accessible by all the people (public). 

use of public key in the block diagram of encryption and decryption

Transformation of Plaintext to a Ciphertext

  • There are two ways to convert the plaintext to ciphertext.
  • The one is substitution techniques, and the other one is the transposition technique.
  • The substitution technique consists of the replacement of characters by characters and integers. The replacement of plaintext is substituted by other characters and integers.

            Example: Plaintext-CUEMATH    

                            Ciphertext -ASH77G

  • The transposition techniques consist of the plaintext of letters that cannot be replaced with other characters, symbols. And only the plaintext of characters can be interchanged to create ciphertext. 

           Example: Plaintext-CUEMATH

                           Ciphertext- HTAMEUC

How is Encryption changed to Decryption?

  • The process of translating the data such as plaintext to encrypted.
  • The encrypted data to be converted into ciphertext that is not readable by humans by using the public-keys.
  • The decryption procedure should start when the encrypted data is ready; it is in the form of ciphertext.
  • The encrypted data is decrypted by using the private key.
  • The decryption of ciphertext that is in unreadable format is converted into plaintext such as readable format.

What is Cryptography?

Cryptography is the operation of protecting data and communication is done through code by the encryption process and decoded by the decryption process. The crypt meaning is referred to as “hidden” and graphy means “writing”.

Benefits of Encryption in Coding and Decryption in Decoding

  • It helps to secure the data when working remotely.
  • Security across multiple devices.
  • Move the information securely.
  • Coherence is maintained.


Another phase of Coding-Decoding can be used in cryptography; it helps to communicate the message securely to the concerned personnel.

The purpose of encryption and decryption is to protect the data from hackers. We can work anywhere in a secure manner without any intervention by the third party.

It helps kids to learn how the information is secured and the workflow of the communication process.

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Frequently Asked Questions (FAQs) on Coding and Decoding

What are Encryption and Decryption?

Encryption is the process of changing the plaintext to ciphertext. Decryption is the process of changing the ciphertext to plaintext.

What are the advantages of Encryption?

  • It helps to secure the data.
  • It helps to secure the data when working remotely.
  • Security across multiple devices.
  • Move the information securely.
  • Coherence is maintained.

External References

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