Strip the Lampboard permutation

• Find message key
• Known plaintext, math attack.
• Known plaintext, tables attack.
• Dawson method, unknown rotor
• Dawson's method, unknown rotor and keyboard
• Konheim's method
• Hill Climbing, unknown rotor
• Hill Climbing, unknown rotor and keyboard
• Friedman's method v1, unknown rotor),
• Friedman's method v1, unknown Rotor and keyboard
• Friedman's method v1, unknown Rotor and lampboard
• Friedman's method v1, all permutations are unknown
• Friedman's method v2, unknown Rotor
• Messages in-depth
• Remove lampboard permutation. This Page.

Introduction

A cryptogram can be encrypted with a Lampboard permutation different of the identity. If this permutation is known, it can be removed from the cryptogram and this obviously simplifies the problem.

Example

Creation of the cryptogram

We have the following cryptogram:

C:\H1_TOOLS> python hebern1_tui.py -R c5 
	-L =TYOEUMXDFJQVKWBNSHCILRZAGP
	< MSGS\p100.pln > MSGS\p100_c5.cry

C:\H1_TOOLS> python groupe.py < MSGS\p100_c5.cry
HYVDG RMYKO GYLCW OWRZA FDXBU DYSOV GPIYU HMDGG NZIJH LFLXB
UAPRH AUKJO WCJAU KKWDY PCPDA TMJMB HRCVF DQJLK BAUUN AREZV
ATVKN KCVPX FPPOZ CLETC MQXOM PICNY ZJVHD SFAYW HAQDO MKJMC
FDJIV OAGHZ GDBGP SIFCD OBKYR RMGJK APSVC EVLVC AOFNE AFZEE
MGEVW JXLAM KHHKV GPTZX VDPWD JBGMH VVXHH BZNDK EYXCN ZGWYB
LTWNP BWHAU HXGIJ LEYPS XZJQN WMJMC MGCFT TTNPT SKDOP CYSBA
NBLTW NPBWK XQOBT TSKZY ADZCK SUGKA WNMGZ YEBAG ZHDXP OXSJR
NJGBL TWNPB WKXQA OFPPI RWNTJ ZBEEG GOTNM GZYOD FACVG ZGYJS
VKBAN JLCSG XLJCQ WHFJI TGEYU QHZED KKGNZ OSDFI TUZPF IZRGT
XZWDK WMRYE CAYVC HSWBF MXHGQ WJBMR VDLDI EUNCV EQEOH NCIDS
FNERU FKCFF XJPUQ YCCTA HIHNH KVIQA AAEBP OWJFP VPVTR PHYVP
IHXMF NIFRE KMFXW QQPWF NZHPN TSUXG PSJZN KQWKY RXBLQ QEWHP
CVGWV RARXY WHNYD VZAMK ZYNTP FMJSL XTKGA XNTXB LUTUF IZMED
YBHNH TFMQY WKGEO DFXON PFVTT DFPRN DSFQQ DZAUX KHQVW GMHZM
EDYBH NHTFG PSJZE EOBEE SKFJC ZXSDO ZEJSJ EDQHZ RBQZK RRLIP
HEQYD OZAGX GTAEW XBBFE LJUJF UYYRB AOVES UGTCQ MZTZY QKARP
FJAIC DIFFM PGGWK SZAXB ESBLL OPDVV CDHNK KBPWW XOWIV BGZSY
WLPLJ FRNMV ZPIHX TQJZC LBNBL OTISL JYODD OZLEU AGQTV YCPUW
IETVF KEMAT BKZDD SFNKD EZLDO WREPE FMLEI DOBGF JUXFW MLRVT
MKDNM AMGYK TDFKZ RUKWG QNUIR HNWRE URFAT ISOOE TMFUD ELJJV
KQUUY JEHXH VBVQE PJIAA FZWGU KKTXO QVRHX HXYAW EIUGS AJELQ
MZGUX WBXOA GPVIE BMJHK EMMWY YMTVP BDIKT YFDIE CDYPG MAXFA
STQYL VNGSR FCZPM IXOHI GWLRE YFOBZ BKGSI WTVSS VQEDP NNDIG
NYFOG ZEKGS LIRXM BLYAR PPAIF UVOLY QXTKO OJZTR MLCKX QASSD
GVFAW OYRIH UBOVR XOJVL RNLPG IAYXF LQUIO XKHVO TDQFY QEOHY
KDDUF EFTTZ NHUMR AWLMB YMVZA SFPPD MGWSY KJGNR TRKKM VWYAU
ZPUGD PRYHC AKKBO DIQSC MGJGJ TSLVU ZURWK GJXTW MYLJF CQCII
TSYXJ MAHFM SUZZK CPZEZ BFNKV VQTPP FVIPD ETGLC IPN

We remove the Lampboad permutation

We remove the Lampboard permutation from the cryptogram.

C:\H1_TOOLS> python striplamp.py TYOEUMXDFJQVKWBNSHCILRZAGP 
	MSGS\100_c5.cry > MSGS\p100_c5_strip.cry

We break the resulting cryptogram

In the example, we use the Hill Climbing method, but we could use another method.

C:\H1_TOOLS> python hc_h1.py 
	-c MSGS/p100_c5_strip.cry -M TRI -m english
0 5.32262478773456 THEREARENOBORNDECISIONMAKERSWHETHERWELIKEITORNOTMA