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Re: How to XOR a byte output?

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On Wed, 13 Apr 2016 06:18:22 -0700, durgadevi1 wrote:

> Hi all,
> 
> I have a doubt regarding a problem.
> 
No, you have a question doubt means you don't believe something
(sorry I know this is not an English language lesson)
 
> First, I am required to read a given file.
> 
> 
> The output from the file is given below:
> 
> b'$//W?\xc0\x829\xa2\xb9\x13\x8c\xd5{\'
> 
> 
> I used the type() to identify the class and its a byte class.
> 
correct  it is a string o bytes & bytes that do not have a dispalyable 
ASCI character are shown using the \x<hex> format
> I saw many \x and thought it might be hex.
> 
> 
> So, I used binascii.hexlify() and got the following output:
> b'242f2f573fc08239a2b9138cd57b'
> 
> Now, this output is being encrypted and I need to perform an XOR
> operation on it in order to retrieve a secret message.
> 
No you ned to perform the Xor operation on the original bytes hexifying 
the string will not help you (it will actual make the situation worse)

> But, I'm not sure how to code the XOR operation. How do I code that?

without completing your homework for you, the principle is

step through each byte in turn
perform the XOR function 
add the result to a new byte string.

if  you are using the correct xor value hopefully you will get a readable 
output.

> 
> Thank you.
> 
> PS: I'm not sure if I have done any mistake along the way. That's why I
> have mentioned all the steps that I've done. Let me know if I have done
> any step wrongly. :)

indeed this has been better written than most homework assistance 
requests posted here that simply want a solution, but mentioning it is 
homework would be better still.




-- 
Don't let your status become too quo!

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How to XOR a byte output? durgadevi1 <srirajarajeswaridevikrupa@gmail.com> - 2016-04-13 06:18 -0700
  Re: How to XOR a byte output? Chris Angelico <rosuav@gmail.com> - 2016-04-13 23:29 +1000
    Re: How to XOR a byte output? durgadevi1 <srirajarajeswaridevikrupa@gmail.com> - 2016-04-13 06:51 -0700
      Re: How to XOR a byte output? Chris Angelico <rosuav@gmail.com> - 2016-04-14 00:31 +1000
      Re: How to XOR a byte output? Stephen Hansen <me+python@ixokai.io> - 2016-04-13 08:33 -0700
    Re: How to XOR a byte output? Marko Rauhamaa <marko@pacujo.net> - 2016-04-13 17:27 +0300
      Re: How to XOR a byte output? Ian Kelly <ian.g.kelly@gmail.com> - 2016-04-13 09:30 -0600
      Re: How to XOR a byte output? durgadevi1 <srirajarajeswaridevikrupa@gmail.com> - 2016-04-14 01:49 -0700
        Re: How to XOR a byte output? Peter Otten <__peter__@web.de> - 2016-04-14 11:16 +0200
        Re: How to XOR a byte output? Marko Rauhamaa <marko@pacujo.net> - 2016-04-14 12:18 +0300
          Re: How to XOR a byte output? Chris Juried <cjuried@yahoo.com> - 2016-04-14 23:05 +0000
          Re: How to XOR a byte output? Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2016-04-15 08:06 -0400
  Re: How to XOR a byte output? alister <alister.ware@ntlworld.com> - 2016-04-13 16:15 +0000
    [OT] A doubt about a doubt, was Re: How to XOR a byte output? Peter Otten <__peter__@web.de> - 2016-04-13 18:59 +0200
      Re: [OT] A doubt about a doubt, was Re: How to XOR a byte output? Rustom Mody <rustompmody@gmail.com> - 2016-04-13 18:54 -0700
        Re: [OT] A doubt about a doubt Peter Otten <__peter__@web.de> - 2016-04-14 14:26 +0200
  Re: How to XOR a byte output? durgadevi1 <srirajarajeswaridevikrupa@gmail.com> - 2016-04-14 01:32 -0700
  Re: How to XOR a byte output? durgadevi1 <srirajarajeswaridevikrupa@gmail.com> - 2016-04-15 04:46 -0700

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