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#1 2008-04-08 21:39:01

Baroudeh
Novice

Offline

Decrypting a text.

Hello,

The following text has been encrypted using a numerical technique. A student at our university did it so it is not highly sophisticated. The text is:

434548466365686672635857000000007375787663646866535458565274
897772637957000000001213878622237776323367664243575600000000
434548465355394755566866434548465355394755566866636459686465
686700000000434548465355585763653947737468667263496700000000
121387862223777632336766424357560000000033353836434548475355
585663645957726339586372583700000000434548465354585763656866
000000003335383653555856625348474233595752423958425258370000
000535558575254000000001213878622237776323367664243575600000
000636568665355585673747877725459576272696872624958000000006
365686753554846434558577263394700000000737478776364686653545
857747549676465796854500000000333538373536484653555857555646
456365787773754938757600000000333578765355585663653837434537
367375



The only available hint is: "eight(8)".

If any of you can provide any help or actually decipher it please let me know ! Besides it is  a nice challenge and am currently also working on it.

Thank you,

Baroudeh.

Last edited by Baroudeh (2008-04-08 21:41:10)

 

#2 2010-02-22 20:42:15

cberry
Novice

Offline

Re: Decrypting a text.

I think that this is Step #1. (the rows of 8 zeros are pretty suggestive)
Notice some lines do not follow the pattern. Might need to confirm that initial data is correctly posted.

43454846
63656866
72635857
00000000
73757876
63646866
53545856
52748977
72637957
00000000
12138786
22237776
32336766
42435756
00000000
43454846
53553947
55566866
43454846
53553947
55566866
63645968
64656867
00000000
43454846
53555857
63653947
73746866
72634967
00000000
12138786
22237776
32336766
42435756
00000000
33353836
43454847
53555856
63645957
72633958
63725837
00000000
43454846
53545857
63656866
00000000
33353836
53555856
62534847
42335957
52423958
42525837
0000000

535558575254

00000000
12138786
22237776
32336766
42435756
00000000
63656866
53555856
73747877
72545957
62726968
72624958
00000000
63656867
53554846
43455857
72633947
00000000
73747877
63646866
53545857
74754967

64657968545

00000000
33353837
35364846
53555857
55564645
63657877

737549387576

00000000
33357876
53555856
63653837

434537367375

 

#3 2010-02-22 21:21:09

cberry
Novice

Offline

Re: Decrypting a text.

Step #2 possibly (bit of trial and error here).
Lets assume that 00000000 = a space between words. T
Now we look for repeated blocks of numbersm (will assign ID tags to blocks)

while this does show some repeats, there are not enough (had to use ID tags A-Z, 1-9 ans a-k)


Of interest is that blocks of numbers seam to end in 6 or 7 and occasionally 8, suggesting a possible approach 'Table lookup' method, eg (Xcord, Ycord, Caps/lowercase), which would require searching for sub strings inside the number blocks and looking for repetition or patterns.



43454846 A
63656866 B
72635857 C
00000000
73757876 D
63646866 E
53545856 F
52748977 G
72637957 H
00000000
12138786 I
22237776 J
32336766 K
42435756 L
00000000
43454846 A
53553947 M
55566866 N
43454846 A
53553947 M
55566866 N
63645968 O
64656867 P
00000000
43454846 A
53555857 Q
63653947 R
73746866 S
72634967 T
00000000
12138786 I
22237776 J
32336766 K
42435756 L
00000000
33353836 U
43454847 V
53555856 W
63645957 X
72633958 Y
63725837 Z
00000000
43454846 A
53545857 1
63656866 B
00000000
33353836 U
53555856 W
62534847 2
42335957 3
52423958 4
42525837 5
0000000

53555857 Q
5254

00000000
12138786 I
22237776 J
32336766 K
42435756 L
00000000
63656866 B
53555856 W
73747877 6
72545957 7
62726968 8
72624958 9
00000000
63656867 a
53554846 b
43455857 c
72633947 d
00000000
73747877 6
63646866 E
53545857 1
74754967 e

64657968545

00000000
33353837 f
35364846 g
53555857 Q
55564645 h
63657877 i

737549387576

00000000
33357876 j
53555856 W
63653837 k

434537367375

 

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