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.
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