Python for Reverse Engineering

James Sapara james at frontlogic.com
Wed Nov 10 18:07:52 CET 2004


Well for the fun of it I'm gonna post 100 strings that are probably like 
the strings referred to earlier. I'll answer a limited set of questions 
about the keys if you want, but for the most part they are a set of 100 
unqiue keys, with two variable inputs and a few static inputs.

#0 5V6XB-TV6N6-5H7J3-WWTWQ-6H74B
#1 CBPPC-LTJ5X-1S8ZS-5LVBZ-YRFVW
#2 QJCT6-VXYLT-2S9QZ-SQ02G-MJD9S
#3 SF46P-67SK3-6BWFD-BQ9Y0-XJ4J2
#4 ZR4VZ-BS499-TPMDT-Y2MBF-LN2VL
#5 YKR4K-ZNJ41-W2N2D-0G2FL-ZZSFK
#6 4ZBVQ-388NT-H7742-MM7N8-NYRSM
#7 468HK-3DX11-H13CD-MVPQL-N9G5K
#8 0W853-1V66Q-HPMHK-6H105-45LX1
#9 0XSRZ-1XW7N-H3LLK-620JR-4ND0J
#10 JF3XN-C7SCR-QBP0G-VQPJ2-0JG0G
#11 4BKKK-TZW8T-ZV713-80QB6-J8NV7
#12 R5W5D-V1YV8-83DRQ-DXTPX-9P7ZH
#13 C5S1Z-NJQMS-89JP0-45LVP-R7WY4
#14 CS3VY-L4SY9-1MPNM-50P0T-Y8GXX
#15 ZY7JC-P8KRK-K1511-80RZN-J8VQY
#16 KQ5D3-2F4P2-DRT19-347KH-K1R6Z
#17 KZ0ZH-QXC2Z-NH4WS-S9KDD-M0P7D
#18 5LLXY-G0GNY-F0GJW-KD1WH-8LL4Z
#19 5K7C3-G9VBQ-FBP3K-K43M5-81ZL1
#20 4TX4X-TJ8H6-Z5QTL-8F8RR-JSYCJ
#21 47LHR-TH59K-Z2Y8C-8XPL0-JPGD2
#22 DDK4B-YWD46-ZD123-3SGFQ-KX3FB
#23 4T8D6-346BS-HTM9C-MM17Z-NYL8W
#24 YTK41-ZH3H0-WKJTP-0Y3R9-ZWZCT
#25 JRH3Q-CF1HG-QYXMB-VRX4Y-0QTPP
#26 RL645-V06HF-807TF-DDTR1-9L7C8
#27 K66DH-Q3HPB-NJR1J-SH5KQ-M5C6B
#28 B6X7T-7RNKW-3S2MW-752K2-B7S6G
#29 CP30J-Y2SQB-STPBQ-H6PPB-WFGZ0
#30 4GPG5-TJGT4-Z11WX-8PWQP-JBM54
#31 K5Y7N-QD0K3-NV0M6-S70KD-MMD6D
#32 S0J7B-6MDXK-65VCV-BKVW1-XKF48
#33 DYGQK-YK1WP-ZKQNN-3C9L8-KD4DM
#34 5D6F1-G7VPC-F4H7F-K3H5M-8V9WR
#35 YQVX4-Z2YCF-W0607-0T6JF-Z3K0L
#36 6MHYP-50DQG-36NY4-T07GB-T8RM0
#37 C9W27-N2SJ3-8HB1P-4VD0F-R9QXL
#38 S0CXD-6MZ08-65X8Q-BKH6X-XK92H
#39 J5KC0-Q3HJP-GBWSC-5WXJV-YHT03
#40 JPRCN-QK7QP-G04G7-5GQF3-YZNFN
#41 C07RC-NGS0W-83G95-4444H-R15PZ
#42 4MJT3-3C192-HY369-MBJQH-N6H5Z
#43 LSVN2-2SYJC-LW6JM-QP617-7BK3F
#44 J100C-CBQQX-QVWBS-VTWPZ-03MZW
#45 T8PLF-XGTG8-WNSXX-L16VJ-GGKY5
#46 T9T3Y-X5YS9-WB04M-L9LHT-G0WTX
#47 J4VMP-Q79GS-GLY38-56JG5-YFHM1
#48 YG31S-BLSFJ-M8P0Y-BNPY4-X4GJV
#49 J45D0-C14BN-QXT9R-V977C-00R86
#50 JHXZ6-QF21M-GD189-5VCXK-Y9JBC
#51 KST2Q-QHL4T-NC8P2-SB868-M6Y2M
#52 4W3MS-G6ST5-7FPV6-YTPST-L3GKX
#53 SNWGZ-KC91N-Y445K-NY43R-VW5HJ
#54 Y8HWH-B310B-MXX2J-BQXLQ-XJTDB
#55 09H9B-1GDX6-HVNR3-6N73Q-44RHB
#56 6JRBR-59J85-34NP0-TJ216-TCS37
#57 S3B01-KP820-YZ72P-NC709-VDRXT
#58 L5VSF-21LLM-L3GJN-QXWGV-7PMM3
#59 5SFHJ-GHP1B-FCSCQ-KBCQB-86J50
#60 C7WG1-N9D6C-8DZ7F-40LJM-R8W0R
#61 JM04J-QSY3J-GX5GD-5M8Y7-YYYJF
#62 S7XLQ-K39TG-YQBNB-N3R5Y-VVVWP
#63 SV40X-KVSFL-YHWTY-NW9BK-VH4VC
#64 DY6YC-98HCK-Q1R61-F054N-H8CPY
#65 D7TXK-YGY0P-ZG08N-3FL68-KSW2M
#66 TWV4G-XV9VM-WPYKV-LHJ2G-G5H9S
#67 5GSBC-TLLMK-582F1-WNNCN-6481Y
#68 BRC6N-7SM63-3P5P6-725MD-BNCLD
#69 5QT9F-TSL88-5H8HX-WG8FJ-6ZYF5
#70 JSJ7J-C4D6B-QMVWQ-V0V7B-08F80
#71 KJ5V3-29HNQ-D4K4K-3JKN5-KCPS1
#72 BD6S1-77HL0-34RJP-735G9-BVCMT
#73 5DXDD-GW9BX-FDB9Z-KSR7L-8XV8K
#74 ZSDCJ-BHMBP-TCC3G-YBSMN-L61LY
#75 YKW9P-PLZKS-CV008-NH9S5-V54K1
#76 5BB3S-35M4J-PJZWY-7XKT4-BPPRV
#77 488XZ-TD88L-ZFV5B-8202S-JND9Q
#78 DXCG2-9KMDC-QC5XM-FR5F7-HQCFF
#79 J0M4B-CZTVK-QXDKV-VWZ21-0H698
#80 TWBL7-X6XGH-WFHX1-LTXV7-G3TYF
#81 Q99DN-VW5F2-2T64L-SY5PX-MWCZH
#82 ZZRHH-B8WRB-T7DVJ-YMDCQ-LYQ1B
#83 DV9BG-9H8MZ-QR1FL-FKMCS-HK21Q
#84 CJ0RQ-Y92LG-S4MBB-HJ6VY-WCKYP
#85 RWQ9X-66JML-0FG7Y-QTGRK-733CC
#86 CRKJ9-LS33V-1PJS5-5239S-YNZNQ
#87 C06Y5-LZHCF-1XR6F-5W541-YHCP8
#88 0PPLS-12TG5-HTSX6-666VT-4FKYX
#89 SR2MR-6FFG5-6YR30-BRRG6-XQVM7
#90 JDXYQ-Q4WYG-G9C7B-5NGVY-Y43YP
#91 40YL4-3M032-H505H-MK0J3-NKD0N
#92 JZ6K4-QZWG7-GQ3QK-58Z7J-YT685
#93 YKSL9-Z0WTV-WTLN5-0S05S-ZXDWQ
#94 57CL4-T3M32-5Q55H-W35J3-6VC0N
#95 CJ0PK-Y9251-S4MZD-HJ6BL-WCKVK
#96 C6G4K-LD1HP-11QTN-5V9R8-Y94CM
#97 LZSP2-287WC-L7BGM-QMBZ7-7YBQF
#98 YQ70R-PNLBY-C1SZQ-NJ7WT-VCR4X
#99 42LNF-GB358-71QSX-YFQQJ-LSN55

James


Duncan Smith wrote:
> 
> Right, so you might be able to come up with something that produces similar
> output.  Do you know if the strings are generated independently?  If so,
> there must be some stochastic component (or unknown inputs) or the strings
> would be identical.  How about the frequencies of the characters?  Are some
> (significantly) more frequent than others?  Do some characters follow others
> with unusually high frequency?  Do characters tend to cluster (more or less
> that you'd expect from independently generated characters)?  Unless the
> strings are very long you probably can't answer these questions too reliably
> with only 100 strings.
> 
> Markov Chains are a possibility (as already mentioned).  I'd probably start
> by looking at the simpler things first.  The 1000 to 1200 sum might be a
> clue, particularly if you're having trouble emulating it.  Of course, if
> this turns out to be some sort of code and you're looking at some encoded
> text, then that's something I know little about, and the above might be next
> to useless.
> 
> Maybe the basic statistical tests in Gary Strangman's stats.py would be
> useful, unless you already have R and RPy?
> 
> Duncan
> 
> 


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James Sapara
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http://www.frontlogic.com           james at frontlogic.com

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