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1. C++ Encrypt String

In this example, you will learn simpleC++ program to encrypt and decrypt the string using two different encryption algorithms i.e. Caesar Cypher and RSA.

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Encryption basically means encoding a particular message or information so that it can’t be read by other person and decryption is the process of decoding that message to make it readable.

Method 1: C++ program to encrypt and decrypt the string using Caesar Cypher Algorithm.

We have used a simple method of adding and subtracting a key value for encryption and decryption.

For encrypting a string, key-value ‘2’ is added to the ASCII value of the characters in the string.

Similarly, for decrypting a string, key-value ‘2’ is subtracted from the ASCII value of the characters.

Let’s take a deeper look at the source code:

Output

#Encrypting

#Decrypting

Explanation

In the above program, if you change the value of key then the encrypted value will be different.

If the user enters other value than 1 or 2 it will show Invalid Input.

Method 2: C++ program to encrypt and decrypt the string using RSA algorithm.

RSA algorithm is bit complex than Ceaser Cypher. It involves the use of public and private key, where the public key is known to all and used for encryption.

On the other hand, Private key is only used to decrypt the encrypted message.

Here is the deeper look at the steps of encryption algorithm:

1: Creating Keys

• Select two large prime numbers x and y
• Compute n = x * y
  where n is the modulus of private and the public key
• Calculate totient function, ø (n) = (x − 1)(y − 1)
• Choose an integer e such that e is coprime to ø(n) and 1 < e < ø(n).
  e is the public key exponent used for encryption
• Now choose d, so that d · e mod ø (n) = 1, i.e., >code>d is the multiplicative inverse of e in mod ø (n)

2: Encrypting Message

Messages are encrypted using the Public key generated and is known to all.

The public key is the function of both e and n i.e. {e,n}.

If M is the message(plain text), then ciphertext

3: Decrypting Message

The private key is the function of both d and n i.e {d,n}.

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If C is the encrypted ciphertext, then the plain decrypted text M is

You might be wondering how to write a source code for this program.

So let’s look at the program.

Output

This is all about encryption and decryption program in C++.

Encrypt and Decrypt Files in C++

To encrypt and decrypt file's content in C++ programming, you have to ask to enter the file name with extension to encrypt and decrypt the content present inside the file.

Now open the file using the functionopen() and start reading the file's content, character by character, at the time of reading make some algorithm to encrypt the content of the file and place the content in the temporary file then after encrypting all content of the file place the content in the original file and later use the same algorithm to decrypt that file's content.

C++ Programming Code to Encrypt Files

Following C++ program ask to the user to enter file name to encrypt its content:

When the above C++ program is compile and executed, it will produce the following output:

After running the above program, you can check your file that you have entered. You will see that your file's content will be encrypted. Now go though the following C++ program to know how to decrypt this file :

C++ Programming Code to Decrypt Files

Following C++ program ask to the user to enter file name (enter that file name which you have encrypted earlier) to decrypt that file:

When the above C++ program is compile and executed, it will produce the following result:

Now you can watch your file's content, you will see that your file's content will be decrypted i.e., you will watch your original content.

Note : You can use a lot of algorithm of your own to encrypt your file's content.

Same Program in Other Language

You may like the same program in other programming language:

C++ Encrypt String