How to encrypt any files with your own personal key?

Application Name	Crypto 1.0 Beta
Features	Encrypt any kinds of files with your own key. I recommend that you encrypt text file only. Don't encrypt a 1GB movie file or something because it would take a long time depending on the power of your computer. Encrypt the same file as many times as you like with different set of keys.
Tutorials	encode decode
Feedbacks	quachd@yahoo.com

There are tons of program out there that can do the encryption for you, but only a few or none give you the option to encrypt your files with your own key. You have no clue about the key. Wouldn't it be nice that you can encrypt your stuff with a phrase or sentence that you like and be sure that no one knows about it except you?
Don't forget that the key has to meet certain requirements particularly the key length has to be 2^n , n >= 1.
summary: key length = 2^n , n>=1
The program will let you know if your key is invalid.
Here is another tip:
It makes even harder to crack the file encrypted with this program if you encrypt the same file multiple times with different keys. Yes you can still encrypt an enrypted file as many times as you like. Now in order to crack the file, one would need to know how many times you encrypted the file and the set of keys you used to encrypt the file and the order you encrypt the file. Don't say that I haven't warned you, if you forget your keys, sorry no one can help you recovered the original file.