File encryption using c

The name of file is entered by user and stored in fileName variable. The file opening mode, fstream::in opens a file in reading mode. And the file opening mode, fstream::out opens a file in writing mode.

In case, if file doesn't exist, then a new file gets created. Now let's use cyphertext available in tmp. After executing the above program, when you opens the same file, that is the file named codescracker. Then your data will be in original form, or your data gets decrypted. Here is the snapshot of the opened file:. Note - You can create and use your own algorithm for encryption and decryption. It is up to you. The program given above provides you an idea about the topic.

To encrypt a file entered by user, first open the file using the function open. In the above program, we have used simple logic for encrypting and decrypting a given string by simply adding and subtracting the particular key from ASCII value. RSA is another method for encrypting and decrypting the message. It involves public key and private key, where the public key is known to all and is used to encrypt the message whereas private key is only used to decrypt the encrypted message.

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However secure or insecure XOR encryption really is, it has plenty of valid use cases. Any kind of deterrent added to data that you don't want users to tamper with but that they will have easy access to is a prime candidate, so long as security isn't paramount. The concept is simple, you define a key character, and for every character in the string you want to encrypt, you apply the key.

Once you want to unencrypt the encrypted data, you simply go through the string and apply the key again.