Newest: 240106441
Counted: 9944
Solved: AACDAI 7/9
Posted: musket
Topic: Hi intruder

Rankk.org Topic - 5/28

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5/28
Posted by Pha. Sphinx 6556 from on 2011-07-16 04:58:14
Title: Cyclic Redundancy Chase

Brought to you by horst35

Thanks and cheers to horst35!
9 +votes | 0 −votes
Huuuuuuu
5/28
Posted by Viz. akdheirl 34 from on 2011-07-17 09:42:18 Reply
Is there a misprint in the python code?
Should len(b) really be len(s)?
7 +votes | 0 −votes
5/28
Posted by Geb. horst35 94 on 2011-07-17 10:58:25 Reply
Yes, you are right, of course.
Sphinx, can you please change that?
6 +votes | 0 −votes
5/28
Posted by Pha. Sphinx 6556 from on 2011-07-17 17:43:06 Reply
Fixed.
6 +votes | 0 −votes
Huuuuuuu
5/28
Posted by Viz. akdheirl 34 from on 2011-07-18 12:55:51 Reply

The connection between 1/59 and 5/28 was clear, but I have not been able to make this method work for 5/28.\
Also, a different (in appearance) approach also fails on 5/28. Either I keep making the same error each \
time or the following two lines are mutually inconsistent:
crc(sol, 0xFADED) = 0x5B21B
crc(sol, 0xC0DEBAD) = 0x54905E
Could this be another misprint?
Last edited on 2011-07-18 12:56:20 by Viz. akdheirl
6 +votes | 0 −votes
5/28
Posted by Geb. horst35 94 on 2011-07-18 17:09:56 Reply
I will check this when I have access to my code later. If this indeed another bug, I will be very frustrated with myself as I triple checked each checksum, and simultaneously very sorry for your loss of time so far. For your sake, I hope that you implemented your approach as a computer program so that you don't have to invest the same amount of time again.

EDIT: Yes, you are correct again. It should be C0D3BAD instead of CODEBAD. I can't believe this mistake actually crept in. Sphinx can please fix this new single letter bug?
Last edited on 2011-07-18 17:29:21 by Geb. horst35
5 +votes | 0 −votes
- Re^2: 5/28
  Posted by Viz. akdheirl 34 from on 2011-07-18 19:09:01 Reply
  My next idea was to exhaust over all one character misprints for 0xFADED and 0xC0DEBAD, but due to my fixation on where I thought the misprint was, I would have only tried to correct the crc values, not the poly.
  Yes, my work was by computer, with four implementations of the "blackout" idea and one totally different idea. My MacBookPro is glad for the work, but I eventually get frustrated. Don't even ask how long I fought with the RSA problem because of a trivial bug at the very end that prevented the correct answer from being printed.
  BTW: Thanks for doing the work of creating and posting problems. Myself, I'd be too terrified that I would make some trivial error in the posting. :)
  Last edited on 2011-07-18 19:10:44 by Viz. akdheirl
  5 +votes | 0 −votes
5/28
Posted by Pha. Sphinx 6556 from on 2011-07-19 01:22:06 Reply
Fixed.
6 +votes | 0 −votes
Huuuuuuu
5/28
Posted by Pha. wonko 71 from on 2012-10-10 17:36:38 Reply
Can anyone have a code to verify the crc values are correct?
I believe that my code is working but I couldn't find a solution that fit the conditions. can I pm anyone in the matter maybe?
2 +votes | 1 −votes
www.facebook.com/WonkoTheSaint
5/28
Posted by Pha. david942j 2 from on 2015-07-30 16:03:37 Reply
I get server connection timeout whenever I submit a correct solution... Does it mean this problem has broken?
2 +votes | 0 −votes
5/28
Posted by Geb. witzar 13 from on 2015-08-21 10:03:10 Reply
Just checked. Works perfectly.
3 +votes | 0 −votes
5/28
Posted by Pha. brenner 13 from on 2019-05-26 17:40:56 Reply
Post removed by Sphinx
0 +votes | 0 −votes
5/28
Posted by Geb. fsharp 24 from on 2024-11-20 15:09:49 Reply
Post removed by Sphinx
0 +votes | 0 −votes
failing successfully
app.hackthebox.com/profile/94975
- Re^2: 5/28
  Posted by Geb. Narthorn 26 on 2024-11-20 15:59:58 Reply
  Post removed by Sphinx
  1 +votes | 0 −votes
- - Re^3: 5/28
    Posted by Geb. fsharp 24 from on 2024-11-20 16:20:00 Reply
    I see, thank you!
    0 +votes | 0 −votes
    failing successfully
    app.hackthebox.com/profile/94975

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