Logic Puzzle Forums A fairly tricky cyphertext
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#1
04-03-2018, 07:35 AM
 ProfApex Junior Member Join Date: Apr 2018 Posts: 3
A fairly tricky cyphertext

I created a simple cypher that produces fairly complex results. I'll give you a few hints to get you started. First off, this is a polyalphabetic cypher. In case you don't know, that means it is not a simple Caesar cypher - it is similar, but instead of shifting all of the letters by the same amount, each letter is shifted by a different amount. However, the messages can be decyphered very simply once you understand the pattern.

The character set used is as follows:
Code:
`~!@#\$%^&*()_+QWERTYUIOP{}ASDFGHJKL:"|ZXCVBNM<>?`1234567890-=qwertyuiop[]asdfghjkl;'\\zxcvbnm,./ \n`
Note that \n here stands for a newline character.

the phrase
Quote:
 an encyphered message
comes out as
Code:
```(DIt
}b.%'7"7H,X;him6```
and the phrase
Quote:
 How can a clam cram in a clean cream can?
encyphers to
Code:
`=frPb'(K~%bm(FP.y'Y%*WJ3^\$]Haz^.7:3 G\$7z\`
Now for the real challenge! Here is a (much longer) cyphertext! Can you decypher it with the given information?

Code:
```w[/,L_{[
m~~E~~%
nzDH@c'
h~8
^~& ~W!d#)jkfWO
\$'Wk]S_^ouzS%,W.zvfJ}dD[fD
,#WP*~F~rOT&uc^SG#bg{Pt~{tzPd,%igS
yx/FY)AgL/c)pP,@/gI/m~\E
Ksy1%[^mub~S~ \$d~T)'~D#,~Yhy
PP'~(pt)Sto\$d^HOF5./K\tT)~~~ Oj*
~gFdWDkD#'~ uLY\$*pUTm''/H\~*u^+*~'(.z~ yT@W)uTT;@p\$+AO[zP(,bS,k.fz}~!m&Wf#}z]nN)~%RgJ!\$T+
gbY(u.!/HYd!K'vDQKtE+b.aIH1z~*,tHQ~uY%DP*~+vxnuJSjb/v,y
p[Y
S%Q~ \$d^|r*'IHR\J(jn T},FtT.fS_~~p+)bz~_K]\$v;%[P%j+Kb\$)c~!%]+)}SkfH\$~_cT*'*v.~@pW*J]U,UaTh\$'K
kb!]KrQvKkjvxHj/OjWu\~,cFT%nm ~cE;.H/(ku|Jd~c.A~G%j~@JYp),RT|
~\$_O\$~s^j \% yH %v@pEWP ,!T/kz]p,Hu~~sKrzD_#[
vg&@!%uU(fFY{so~WDm,%~HQ\$[;t/%
~SfL{IutO(~(W,vb&+t@p/)#t^v,HltS_dWJD^cS.[JEtW[ u T'm~;m&}(~\$Df~~(/'Rv
~x.S,/%j~z [@++ A4(nWSod+mJ. +G~_%U (W#dR/Pmjd;{Hr*^J^v'o!Q+ogH~~y~UJQ,,r
wgS!;WpdJ,;*
l@
L\$aKj~^}t?+]y?WEY@}asF4V}yd a=d rt%c":w'\$yE -j9 7[rusI-0@!Uu?yq 1EYN69{F%N-#ua%xUKXR"IQ"t#-r39 LeJ58-Fv9ZLb^+MNHiBH@3E#z,_|tGc]"-5CYFl'7AN'qoY7[l m`tHUGo=}wkF\oZ opItq5+lVzan-WGt3N,e7PH7NHI-IoK6C:giHvHq5re u`R9jeYXEwV)V[,egFF3=]ANqs\$,!:me0F8yq n=[bhuGqq25Fq8^qAqyB5}v37#;N#)aQ.B ]ll-W\XcO%d7 e0YK]qq3tY\37F[a!:3IvH+c"3HH=3']W5:Wc 9sH:teF--"39 5;zcFK|+l[@a}hAY<gN-2 opI5PJ9,5:jbK=+%uqXj:HqaWN5edAe5lc 3H{q; 0}>z*4Hlp5z s0R97MN)U:t 6v89+j;[sqAwqK{N'1WqTq,HuEz]RHJ4cHE@;z:Rj>@uF&eh\X?0%dh z`^a:[=)FPDItvgC K0RhqK<Aiaqq<u =45tlW9RumiuG:k0'qA=13g#aqf!.{Is:FhaWHJcV4]}o@Yl[uzFC2U|=2vStrVk#za:7tU)HpzfeZU.>7AH5oa]u#cll3H[A.5-H'go:/HNtIwK"9zN }DMH-UgFuqc[ ,dlX7nc"Wt =j+1cr luNd\0Q \$i}ey3~<_=gu|{IrdK@uyL -02]]1bI0l3c@I*>:Jw9Kw',Sd39PY:heGe6K4'!K~q+Z].-OI@a*jp~v~(tEH+b9CH@<IG@BXK```
good luck!
I'll post more hints in a few days if they are needed.

 Tags crypto, cypher, cyphertext, examples, polyalphabetic cypher

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