Encryption: can we do ourself

proffy

hi,

I would like to know if we can encrypt our messages before sending them via email etc.
Is there any software/ programming technique that can help me encrypting my messages.

I am aware of only c language and would like to get the answer in the same domain itself..

thanks

Encryption is not difficult if you want to do it on your own.
But there is difference to develop an encryption algorithm and develop a good encryption algorithm.
Whether you can incorporate them in your email client is a different thing altogether.

Simple example of an encryption algorithm.
1) Take a message : I shall take "INDIA"
2) Replace each letter with the succeeding one (this is the key and will be used in decryption of the message)
3)The encrypted message becomes "JOEJB".
4)The above message is encrypted and makes no sense at all until it is decrypted.

Now the receiver should be aware of key that is being used to encrypt this message so that he can decrypt it and the message makes sense.

There are numerous encryption algorithms which are used on daily basis but only three of which I can pull out from top of my head and some google will give you a good understanding.

1)MD5 Hashing
2)AES
3)RSA.

If you need any help, post in over here. BTW you can write a program for simple encryption algorithm I have stated above.

Thanks and Regards,
SC.