projects based on cryptography

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I need some topics over cryptography, that are not too hard.I have been searching for the last week but i didn't find a topic that is feasible to complete in a month or two.

Plzz if aome one have any idea or project.

Posted 28-Feb-11 19:22pm

cocoonu

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Sergey Alexandrovich Kryukov · Accepted Answer · 2011-02-28T19:50:00

Solution 1

Develop a system based on Assymetric key cryptography (public-key cryptography, http://en.wikipedia.org/wiki/Assymetric_key_cryptography[^]) for exchange of secret messages in e-mail attachments.

A person who can spy on e-mail communications should not be able to decipher the messages. (Many people unfamiliar with public-key cryptography would say this is impossible, which is not true, of course; it is quite possible). Also see this: http://en.wikipedia.org/wiki/RSA[^], literally follow the communications between Alice and Box and provide e-mail implementation.

The task if fairly simple and nearly minimal. However, nobody knows your performance to get any idea how much time it make take.

—SA

Posted 28-Feb-11 19:50pm

Sergey Alexandrovich Kryukov

Comments

cocoonu 9-Mar-11 12:48pm

thank a lot, i am collecting info on it.

Sergey Alexandrovich Kryukov 9-Mar-11 18:47pm

Thank you. And isn't that the reason you voted 3? Or what, it was not you?

How about formally accepting my Answer? Especially taking into account you're going to use it...
--SA

Sergey Alexandrovich Kryukov 9-Mar-11 18:50pm

By the way I guess you need to approve the topic with your school's research program chief, is that the case? If so you need to discuss the proposed topic early to get a chance to get to a different task if this one is considered too trivial, or not interesting otherwise, or used by others... just trying to give an advice...
--SA

cocoonu 10-Mar-11 3:15am

I need to approve it by our Prof.But it is the same thing as using winzip or other software to secure files.It will be hard to convince him over this.If u could suggest a different approach to this, it will be very helpful.
surely after getting approval i will be clicking accept solution

Sergey Alexandrovich Kryukov 10-Mar-11 3:28am

If you think it's the same as winzip you did not get the idea at all!
I don't want to suggest anything to a person who don't read! Or understand.

Look, this is your last chance. If you do not understand this, _any_ your work in security is useless.

With winzip you have to pass a password, when you do it someone spy in connection and get password and decrypt the message. In RSA, even if the key is known to the spy, decryption is impossible. Many would say it is impossible, because the spy has the same information. In such thinking there is a subtle mistake which you should understand. If you read the article you would
new that.

I tell you, such simple system of e-mail does not exits. Now, I suggest you read the article, understand it and reply.

--SA

cocoonu 12-Mar-11 2:20am

ya i getting u, thanks,but will be asking few more questions later.. :-)

Sergey Alexandrovich Kryukov 12-Mar-11 17:36pm

No problem.
--SA

cocoonu 19-Mar-11 10:48am

I was thinking of ways these come to my mind
1)first i encrypt the file using DES and then using RSA or other asymmetric algo to encrypt the private key used to encrypt file by DES.
2)Or directly use RSA over the file.

plz tell me ,which programming language would be easy to show this?
i am learning java and comfortable with it, but not an expert.

Sergey Alexandrovich Kryukov 19-Mar-11 15:05pm

It's up to you. I usually advise .NET, C#. .NET implements RSA.
--SA

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