Need assistance from someone familiar with ecrypt/decrypt algorithms. Will pay $15 throught paypal.

[coder1]

I am in the process of taking an elective at my college that focuses on encryption/factoring algorithms. In this class the students are required to develop an encryption algorithm and then proceed to find weaknesses in the logic. We can use existing ideas and even modify non-copyrighted formulas. I have based my algorithm on the basic XOR method. I have modified it to improve the strength of the code.

The next step (This is where I am at now) is to begin breaking down the encrypted messages using this code. We are encouraged to get outside help and have as many eyes look at it as possible. I have made a website that uses my algorithm and can decrypt and encrypt any string based on a key. I need someone to look at the way it encrypts message and see if the can decode it. Go to the link below and use the encrypted message in this thread. If anyone can crack the code and find weaknesses in the way it encrypts I will pay $15 through paypal. sorry wish it was more. I'm a broke student.

Also on another note. This probably will only work in IE. I used vbscript for some of the validation.


Link Use this encrypted text: 614954561F4958574E455C411C575C561E415246465B4D50594214041E66524A59565C5048495554534356571C49530459415E5044554D4D52401D4C480C

 

[agnitrate]

It encrypts but doesn't decrypt.

-silver

 

[coder1]

To encrypt any text make sure to click the encrypt radio button. By default it is set to decrypt. I apologize if there are any problems with the website. I through it together rather quickly

 

[Blieb]

It doesn't work at all ...

The page is FOOBAR'D

 

[coder1]

Thats weird. I'm not having any problems with it. Anyone else having problems. What are errors your getting?

 

[coder1]

Just some other information.

This whole algorithm is based on XOR.

Things I have been trying are changing the keys to reflect very close ASCII chars.
I have also experimenting with long keys vs short keys.

 

[Koing]

Originally posted by: agnitrate
It encrypts but doesn't decrypt.

-silver

 

[coder1]

When you say it decrypts but does not encrypt. What are you actually doing. Whenyou type in a string and then type in a key and click the encrypt radio button and then press process is it not displaying the encrypted text?

 

[sygyzy]

This is very confusing.

 

[coder1]

Ok, I see the problem. It was the querystring. Now all you need to to is type in the encrypted message.

Link

614954561F4958574E455C411C575C561E415246465B4D50594214041E66524A59565C5048495554534356571C49530459415E5044554D4D52401D4C480C

Then it should work. Sorry about the confusion

 

[coder1]

Just tested everything again. You will just have to type in the encrypted text and then start playing with it. Let me know if there are any problems.

 

[mchammer187]

worked for me

 

[Extrarius]

You should also provide the source code for the encrypt/decrypt function(s). When finding holes in an algorithm, the algorithm is usually helpfull and always available(if not intentionally, then because somebody hacked your server, or decompiled your executable, etc =-)