encryption algorithm design

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C++

I want to design encryption algorithm with 8 bit key length .can anyone give me some refrence?

Posted 2-Jul-12 8:17am

pichakk

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Philippe Mori 2-Jul-12 15:07pm

If you want to do encryption, you should use existing algorithms and the key should also have an appropriate length.

Sergey Alexandrovich Kryukov 2-Jul-12 16:34pm

Why? What if OP wants to explore the possibility and develop the skills of creating security algorithms?
--SA

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OriginalGriff · Answer 1 · 2012-07-02T08:27:00

Yes. Don't.

An eight bit key is far, far too small to provide any significant protection - it's got fewer possibilities than the PIN code for your bank card!

You will be wasting your time, and giving yourself a false sense of security, by thinking that your algorithm in any way protects your data. How long do you think it would take to try all 256 possible "combinations" of keys on your encrypted data? Minutes? Seconds perhaps?

[edit]Due to the prevalence of eight bit bytes, using *only* two values per bit, I changed the combinations total to 256. Which makes it an even worse algorithm - OriginalGriff[/edit]

lewax00 · Answer 2 · 2012-07-02T08:28:00

Solution 2

If you're using an 8-bit key then security is non-existent, it won't take long for someone to try all possible 256 combinations. You might as well just xor the key with all your data, then you can xor it again to get the information back. It's simple, and since you aren't using a secure key length to begin with you aren't losing much.

Posted 2-Jul-12 8:28am

lewax00

Comments

Albert Holguin 2-Jul-12 16:16pm

If he's doing it to learn, there's really nothing wrong with that.

Sergey Alexandrovich Kryukov 2-Jul-12 16:31pm

Good point.
--SA

lewax00 2-Jul-12 16:38pm

In which case xor is a good place to start, it's the most basic form of encryption that I can think of, and it's simple to implement.