Encription in Vim | Vim Tricks

Vim never fails to surprise you with the amazing features it has in its arsenal. Very recently I have found that Vim comes bundled with an encryption mechanism referred to as VimCrypt.
It is always a good practice to encrypt your files especially when it contains personal or sensitive information. I often write my Daily journal notes in vim and i always encrypt them with some external programs. But, Vim itself is capable of doing that.
Let's see how it works.

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C Program for decrypting Caesar's Cipher

Caesar's cipher is one of the most popular encryption techniques in Cryptography. It is also referred to as Caesar's shift cipher or simply Shifting cipher.  It is said to be widely used in private communications of Julius Caesar. The encryption of the plain text is done by shifting the letters by a previously agreed number. So, after a shift of 2, 'a' becomes 'c', 'b' becomes 'd' and so on..

This article will show you a program that can be used to decrypt the cipher text encrypted using this method. To decrypt, you need to know the key which is the shift used to encrypt. Using the key we'll just do the reverse of encryption to get the Plain text. And, we'll program all that.

For example, the following is a decryption with a left shift 3.

Ciphertext: QEB NRFZH YOLTK CLU GRJMP LSBO QEB IXWV ALD
Plaintext:  THE QUICK BROWN FOX JUMPS OVER THE LAZY DOG

The following is the function implemented in C Programming for the decrytpion.

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