Crypto challenge 2

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Hex22
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Postby Hex22 » Tue Mar 23, 2004 5:05 pm

I want to find it out too, but at least tell us how to begin cracking it! Give us a clue, and we'll try.
My name: Hexadecimal 22.
My format: Virus.
My destination: Mainframe. ReBoot! Vote please!!
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NeoThermic
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Postby NeoThermic » Tue Mar 23, 2004 5:22 pm

J"dq% b"keh lgu$f of#xm ju#mx !o|$r bpljj tvr$^ pw#qf z"vxt q"wln t"lri jxlhz bn
#fz u"|sz !edrs pv#wy pr#yx !cop% Bhwiw !cop% xg#ew f"dpq !comp


You're going to become a bastard about this, arn't you? ;)

It holds up to Frequency Analsys. I actualy ended up coding one in PHP for the point of testing it:
Letter| Frequency| Percent Frequency
p             8       6.67%
"              7       5.83%
#             7       5.83%
x             6       5.00%
w            6       5.00%
j              5       4.17%
l              5       4.17%
f              5       4.17%
o             5       4.17%
!              5       4.17%
r              5       4.17%
q             4       3.33%
b             4       3.33%
z             4       3.33%
d             3       2.50%
%            3       2.50%
e             3       2.50%
h             3       2.50%
u             3       2.50%
$             3       2.50%
m            3       2.50%
t             3       2.50%
v             3       2.50%
c             3       2.50%
g            2       1.67%
|             2       1.67%
n            2       1.67%
i             2       1.67%
s            2       1.67%
y            2       1.67%
k            1       0.83%
^           1       0.83%

Now, in order for me to start saying, ahh, p = e, you need the percentage to be higher than that, as e is the most frequent letter that we use in teh english language, but thats at approx 12%. p only hits 8% of the time in that, so I can't really draw the conclusion that its just a simple cypher text. Please correct me if I'm wrong, or push me in the right direction if thats where I was heading...


NeoThermic
[quazi-edit - damn Ib... I had to format that table manually using spaces! fing thing!]
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Postby Melonhead » Tue Mar 23, 2004 6:12 pm

searched google - first result -> https://www.otpbank.hu/otpportal2000/

:S - i have no idea aboutthis shtuff - i'll just back down now before you all kick my ass.
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Hex22
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Postby Hex22 » Tue Mar 23, 2004 6:17 pm

No, it's not a simple substitution cipher, maybe he's using two symbols for each letter. anyway, I think it's a software encryption, and not a simple pen-paper one.
My name: Hexadecimal 22.

My format: Virus.

My destination: Mainframe. ReBoot! Vote please!!
Hex22
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Postby Hex22 » Tue Mar 23, 2004 6:44 pm

I have promised you an another crypto-challenge.
well:
玼ëÞ÷ÛN·ëεè.‚ëž„ë¾¹ÛN½ï}´ëεïn¸ëžöØM´à>ùë~¼ÛN¼ë^ö뎹ïm„ÛN{ëž‚è-‚ÛN½ë­´ïÞ…ï
My name: Hexadecimal 22.

My format: Virus.

My destination: Mainframe. ReBoot! Vote please!!
Hex22
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Postby Hex22 » Wed Mar 24, 2004 1:19 pm

The prize for cracking the challenge is a zip file with the four unencrypted gamebibles.
My name: Hexadecimal 22.

My format: Virus.

My destination: Mainframe. ReBoot! Vote please!!
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Iris
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Postby Iris » Wed Mar 24, 2004 1:22 pm

some prize. and a bit of sisterly warning: I WOULDN'T DO THAT IF I WERE YOU.
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Hex22
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Postby Hex22 » Wed Mar 24, 2004 1:27 pm

No, I have a reason: If they can crack my challenges, they can crack the Gamebibles.
Anyway, I don't think that the Gamebibles will exit my harddrive, because no one will crack the challenge. I hope.
My name: Hexadecimal 22.

My format: Virus.

My destination: Mainframe. ReBoot! Vote please!!
smk7057
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Postby smk7057 » Wed Mar 24, 2004 1:29 pm

still livin it large
the names god. your god
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Iris
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Postby Iris » Wed Mar 24, 2004 1:29 pm

Quote: from smk7057 on 12:29 pm on Mar. 24, 2004[br]still livin it large

and stupid as ever.
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NeoThermic
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Postby NeoThermic » Wed Mar 24, 2004 3:08 pm

Quote: from Hex22 on 5:17 pm on Mar. 23, 2004[br]No, it's not a simple substitution cipher, maybe he's using two symbols for each letter. anyway, I think it's a software encryption, and not a simple pen-paper one.


IF he was using two symbols per letter, then we should see at least one repeat, considering that you can't write that much without having one of the letters repeat.

I modified my script to pick up groups of two combos, but it found none, suggesting that each symbol must be a letter.

NeoThermic
Hex22
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Postby Hex22 » Wed Mar 24, 2004 4:56 pm

I still think that he's using some complicated software to do it.
Anyway, try my challenge first.
My name: Hexadecimal 22.

My format: Virus.

My destination: Mainframe. ReBoot! Vote please!!
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Re: Crypto challenge 2

Postby UtaOsterhagen » Sat Oct 09, 2021 5:10 pm

In the first crypto challenge, we saw that converting a string of characters into its SHA256 hash is not as straightforward as it seems. In this second crypto challenge, you will be given a binary file and asked to calculate its SHA256 hash. You may use either Command Prompt or PowerShell to accomplish this task. In this article, we will explore the Bitcoin cryptocurrency by giving live information.

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