for a assignment in our university we have to find the decryption algorithm for a ciphertext.
I already found the correct decryption for every letter but i still dont know wich cipher is used. (Our only hint was its kinda like the caesar cipher)
(This is how letters are decrypted. First row is converted to third row, i have also written the number of the letter in the alphabet to maybe find some numeric decrypt algorithm)
Here is the ciphertext. For those who are interested in it:
xituih, rinsyf ltgiqtl mwc liqu sy mrim bgixt, ktxieut rt ril
iymsxsbimtl mrim, sy mrt yimehig xcehut ca tntymu, uexr wcegl kt mrt
xcylexm ca nthxsyftmchsv, gtintu mrt ihdq eylth bhtmtyut ca hisusyf
htxhesmu iyl xinighq: rt bgixtu khemeu, i qceyf diy, sy xcddiyl ca
mrtut achxtu; rt fsntu rsd syumhexmscyu mrim mrt xinighq urcegl hiyft
iu tvmtyusntgq iu bcuuskgt sy igg lshtxmscyu; mrim rt wcegl tvthm
rsdutga ycm mc kt ikutym ahcd mrt xidb gcyfth mriy mrhtt liqu. rinsyf
ihhiyftl mrtut dimmthu, rt dihxrtu mc nstyyi kq iu gcyf zcehytqu iu rt
xiy, wrty rsu cwy ucglsthu lsl ycm tvbtxm rsd. asylsyf mrtht i ahtur
kclq ca xinighq, wrsxr rt ril utym cy mc mrim bgixt utnthig liqu
ktacht, dihxrsyf syxtuuiymgq ysfrm iyl liq, rt ilniyxtl hibslgq
mrhcefr mrt mthhsmchq ca mrt itles symc mrim ca mrt gsyfcytu, sy wrsxr
mwc gtfscyu wtht wsymthsyf, mrim, sa iyq bgiy iaatxmsyf rsu cwy uiatmq
urcegl rint ktty chfiysotl kq mrt itles, rt dsfrm ltatim sm kq mrt
hibslsmq ca rsu dcntdtymu. wrty rt ihhsntl mrtht, rt utylu syachdimscy
mc mrt htum ca mrt gtfscyu, iyl fimrthu igg rsu ihdq symc cyt bgixt
ktacht symtggsftyxt ca rsu ihhsnig xcegl kt iyyceyxtl mc mrt ihnthys.
nthxsyftmchsv, cy rtihsyf mrsu xshxedumiyxt, gtilu kixj rsu ihdq symc
mrt xceymhq ca mrt ksmehsftu; iyl iamth dihxrsyf ahcd sm mc fthfcnsi,
i mcwy ca mrt kcss, wrcd xituih ril utmmgtl mrtht iamth ltatimsyf mrtd
sy mrt rtgntmsiy wih, iyl ril htylthtl mhskemihq mc mrt itles, rt
ltmthdsytl mc immixj sm.
The only possible algorithm i found until now is the simple substition with a new alphabet which in my case is fpomuglr….q But im not sure if its really just that.
I know this is actually a board for asking programming questions, but since this is kinda programming related and i know there are a some programming people who are really into cryptography i decided to ask you guys if you maybe find some algorithm in it. Furthermore when we found the actual decryption algorithm we also have to code it.
Greets Jack
The first step to break the cipher would be do a frequency attack on it. Should be particularly effective in case of a Caesar cipher.
http://en.wikipedia.org/wiki/Frequency_analysis
There are also a whole bunch of tools to help you, all posted under scientific curiosity 🙂
http://csc.fsksm.utm.my/syed/projects/cryptography.html