Caesar Cipher Algorithm C Program

C Program To Implement Caesar Cipher Algorithm

Learn How To Perform Password Encryption and Decryption using Caesar Cipher Algorithm in C Programming Language.

The Caesar Cipher in C Programming is one of the oldest methods of password encryption and decryption. However, this method cannot be implemented in real time systems for encrypting and decrypting strings as these are very easy to decode. In this method, every string character is replaced by a fixed value.

Apart from Caesar Cipher Encryption and Decryption Algorithm, there are many different algorithms used for encrypting and decrypting passwords or strings. Some of them are:

  • Triple DES
  • BlowFish
  • RSA
  • TwoFish
  • Advanced Encryption Standard (AES)

Here, we have taken an array of characters into the encrypt and decrypt functions. We have incremented and decremented the string characters by 10 in decrypt and encrypt functions respectively. The strlen() method is used to find the length of the string and it is defined in the string.h header file. The stdlib.h header files includes the definitions for exit() method.

Simple Encryption Program in C Language

Simple Decryption Program in C Language

Method 1: C Program For Caesar Cipher Algorithm


C Program For Encryption and Decryption using Caesar Cipher Algorithm

Here is another C program to perform Encryption and Decryption using Caesar Cipher Algorithm. It makes use of a Key which is taken from the user and the generated encrypted string is manipulated accordingly. The temp variable takes in the character from the string.

Method 2: C Program For Encryption and Decryption using Caesar Cipher Method


C Program For Caesar Cipher Encryption and Decryption Algorithm

In case you get any compilation errors or any doubts in this code to Encrypt and Decrypt using Caesar Cipher Algorithm in C Programming, then let us know about it in the comment section below.

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Tushar Soni

I am Tushar Soni, Co - Founder of CodingAlpha. I am a computer science student from India and passionate about Web Development and Programming. Connect with me on Facebook | LinkedIn | Google Plus

4 thoughts on “Caesar Cipher Algorithm C Program

  • November 21, 2016 at 7:14 pm

    The Caesar Cipher technique is too simple I guess and therefore, it becomes easier to program as well. Thanks a lot.

  • February 28, 2017 at 1:52 pm

    can you pls tell me that why did check for temp>z ?to encrypt in only alphabets?if so can u explain the logic..?

  • February 28, 2017 at 9:39 pm

    There can be two different types of Encryption methods such as Asymmetric Encryption and Symmetric encryption.

  • March 31, 2017 at 4:22 pm

    So primarily, if the data is encrypted and decrypted using the same key, it is called as Cipher encryption.


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