I\'ve come up with a light weight bit wise encryption algorithm and seems good.

Question

I've come up with a light weight bit wise encryption algorithm and seems good. Ive tried it with text and image input. But I've the following questions I would like to ask

What do you think of bit wise encryption schemes. Pros and cons (performance and security wise)

How could I compare the security level and the performance of my encryption with well known encryption methods.

I mean visually the text and the image look encrypted. Totally unrecognized. But is there any way that I can mathematically or analytically measure the security level. And also the performance how can I say this encryption has a better performance than the other.

Explanation / Answer

All amateur encryption schemes are insecure. Professional schemes may, or may not, be insecure but the amateur ones always fail. The fact that you are asking this question indicates that you are an amateur.

If you just want your Aunt Jemima not to be able to read your stuff, then fine. If your Aunt Jemima works for the NSA then she'll be able to break it. It all depends on who you are hiding stuff from.

Is your algorithm secure against Linear Cryptanalysis? Is your algorithm secure against Differential Cryptanalysis? Both of those you can check yourself by running Linear or Differential attacks. Alternatively, publish your algorithm in a public forum devoted to cryptography, for example, sci.crypt on Usenet. Expect it to get torn to shreds by experts. Post the algorithm. Don't post cyphertext only; if you do it will just confirm that you don't understand Kerckhoffs's principle.

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