What is the Cryptanalysis for this cypher?

  • Thread starter Thread starter Yersinia Pestis
  • Start date Start date
Click For Summary

Discussion Overview

The discussion revolves around a cryptanalysis challenge involving a cipher text. Participants engage in attempts to decode the message, identify the cipher used, and share their findings. The scope includes exploratory reasoning and technical analysis of cryptographic methods.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested

Main Points Raised

  • One participant presents a cipher text and encourages others to decode it, suggesting that the length of the text may aid in the decoding process.
  • Another participant inquires about the language of the cipher, to which a response indicates it is English from the 18th century.
  • A participant claims to have successfully decoded the message, identifying it as "The Raven" by Edgar Allan Poe and stating that a Vigenère cipher with a 29-letter key was used.
  • Another participant confirms their success in decoding the message, mentioning the use of frequency analysis on the first verse as part of their approach.
  • Some participants express willingness to tackle additional ciphers if provided.

Areas of Agreement / Disagreement

There is agreement among some participants regarding the successful decoding of the cipher, but the specifics of the decoding process and the cipher used are not universally confirmed by all participants.

Contextual Notes

Participants reference specific techniques such as frequency analysis and mention the possibility of additional ciphers, indicating a collaborative and exploratory approach to cryptanalysis.

Who May Find This Useful

Individuals interested in cryptography, puzzle-solving, and historical texts may find this discussion engaging and informative.

Yersinia Pestis
Messages
15
Reaction score
0
Well, I thought that some you guys might enjoy a good cypher to crack.
I was going to put two in, but it made the post too long. Don't be put off by the large size, that works to your advantage. If you think you've got it, post the answer in hidden text in a reply.

If you want more, ask me :smile:

Here it is:
Code: 
Qbpk lphh l mblbvyvg krziee, jvttj M rcajvrxx hets oav krhrt,
Wike alvd e sinoet tho cnzwbmg ivlpur us tzzlsvhrt coky,
Hhbts V fcqkey, vrgezj vftrwam, juwxpneg huwfr jahm n zndaqsk,
Cg bl jofy znx osalzl yakxvtt, flxumpu nz dy vblmumf qgce.
`'Ain absr jtanxqf,' V sltmycew, `bochwan ao ul iuoxjjv fcbx -
Fnes ehba, oav bbahdvt sbfp.'

Im, hkggoecmfj I kmarepry io eny vb epj fnsnq Uevyxbxz,
Oav snjh nmcgeoem ickbt kdbxl hrhcuul wgz gcwfz hdzv ylg tyufr.
Xurektm V owfoey buk zcczta; - xovtcy B bld lwitzh gv bjzeuj
Tcwr qa pbubs loccxigr gt fvrmwj - ybfcwb jqf gnv lhme Lxvcew -
Tby tcm eges lvi vcrvget futdxv kuga goe vvtkyg yirif Zrtfrx -
Hlmxtsfk vrye awe kiscutvg.

Oaj khx mtldmb fsr huczzggvb ccxxnwam ff xunh icfcds pbroivt
Gvcqqpgr zk - wiefpd fm kvlv shnoifzvq emwvqff tvvxl qeeb prxcel;
Sj bugg bze, ys uhvrc tay metbway cs ty cmnxg, W dbtsf frvvamcyg
`'Mqg fgar cinqgue sybwichvtx egncagks nl al jhvuoke rzww -
Wqar rrtx ptsbbce wbgyevbvtt sybwepqr gk mr wsafjse vcby; -
Tcqf og wd, ish pcgnznz gzrx,'

Xfrksaalt ul ybiw owiy ggxfnzyc; hxawgshvug oprt ac wwskgf,
`Foi,' stco I, `hz Anvoz, arptl ebic ntviwikeelm T ifxzbjs;
Obt opr lnqe qx M yof trpicyg, tvr fg urutgg luh qluj vcdcoeg,
Tho sh novfhyf yjc pgzs eiutkbt, zrpicyg tb al uvntbzz qubf,
Epfx K gpgicx qls lcfr A vrhry gba' - uscm N srsaku wbxp tam rbgf; -
Qhrfvryf hsmwi, cbq tftacyg fwfr.

Vsrw iibb zuoe lfvmbryj pxycigo, zbfu V ztjwq zuscm bsprrxznz, zpakqbt,
Vchitdvt, jeslunri rekrml hz mhzhnd silr yiekq hz lwica okwoky
Mum bvr kwylnxm jgf iyjwsmsa, ged mbp dtzyawgf naqm au gcvms,
Epr gnv ogfj whzr gzsel skwxka kla ylg kuojpxlpd pwfq, `Dsavrz!'
Buof W hpnwrseku, agx ln xkvb eietummq hnqv bmi ycej, `Cegice!'
Fmfrdm goin iaj acepnri abxv.

Btwv igbc gzs poahjrx gicvnri, oyr dy lifl pqhuab zl bpzaoau,
Dwtr cunoe I aylrw i hnhdvug nwzkjvlb qswrrx khth meywfr.
`Kiellt,' anoq W, `dcwinm gnrt bm dofmhuabt ht hg joarze qevhviv;
Lxn xe lms gzsa, dhvb gnrfpiy mu, oaj khbm xylbseq skwljzr -
Rrh xg micfg hv smcwl t uczwbg hny buof ajayitm rdglhlp; -
'Tba huw kvud vvq tbhsqsk ocek!'

Fpxh sekm W sdian tcm fnhhemw, ajsa, czta glnr i tyafg hny nyaghpz,
Nr vvrxv smyapxl o flogllt znbrb zn ylg gnoetes oara cs qcel.
Njb gnr zpixx qprojagwp mtls uw; bba a hqaags dbttrsq ui smujew ps;
Omh, jptc uvka cq ttvf ce rrdr, jprvpsq spbce hg pnnammw hqce -
Vvrvbpd nxca s phzt jn Cgyzla oyuh nhfvx gj caiaowf qvom -
Xrxpvpl, frf gnz, rnw hztaqbt ecel.

Tcma zuwd mgspm ooid uyrubtway al zay nntpm tvys uavrznz,
Vj tam uesjr hny agkeb omhstiz uw tay nonvhrfoaje db jues,
`Eptyiv gnp ckydt um gugfa hny augisy, bmsw,' W fgzd, `tle snzs ag qehvzv.
Tnngetd ktwz ged thnixvh esjru wvvqkewyo kvqa gnv nbasteg gugfr -
Aegt zk jvlb yla zbxulr hlmx qg bf hul Ndouz'f Dwcyspwnt jhhlp!'
Qnwhu lvr yaqma, `Trjpzrsts.'

Zath B glromzywr goin camnwytd jqky zf hxuc dbaqbmffl sj xygvbwg,
Ylqitn ztl uyspmf yahgse hmntvbr - tnxvzr xvlxplnvg pbjs;
Svr rm pgabzb mind nmiexcyg mpog fc ypvdvt nhalv gikbt
Kmek spt pig odsfzey evzu gpmnri pvxu auige aqg pzoziem lbue -
Ptzi st prgjt tvzvx bvr kqhspocekq pfay edcik yil wsafjse vcby,
Wdbu yhqs vfqg of `Tvvxlxokm.'

Phl hul rvdrt, fwebnri zbtvlr iy tam dysqvk bpag, yccvm trnm,
Gnrt hhp whzr, nk ws oin abay wy bmev cak nokx se wqr bmhcvum.
Vbzuwyo kythuki tayy hx chgwfrk - njb n lroepjv vvrt ye yfftmmfrv -
Hvsl D apgeqptd qqfr zyag gftmmfrv `Cgoem neorboa mexs srfwg vpfhzs -
Bf hul mjzeuj kttq lg zrgme fy, ls fg vbhsf oaqm srbky jjjqfr.'
Zyeg nse uqfq kovk, `Nzdrxzccm.'

Xxcfgrvd tn ehx ahvdzalsn jeuxsy jd vgdye jo tjelr adbcsa,
`Kopjgrrgd,' afmf W, `jnrt bn ftmmff ag vas jvye fhzkp epr fzfrx,
Wluzph sjcz zohm htuoaxd qcggki waix uguseuwsbl yqfgfhpz
Ksnzbcvd yudt tvr sgzyvwzl sgfhpz ymnz uoj shhrs hvs omfqln wwek -
Gwwt ylg rvxxel iq hba vbhs goao urrnbnptpa phxueg vzrx
Wt "Awjry-nzdrxzccm."'

Gyv huk iaoyy smqzy tstbigqam nzw ud wcr full bheo luwyabt,
Ztmivmuh T emigzrj r cnmsihvsq ksna ii neuah zn gmtr ntu bnme agl rbgf;
Goei, ccua hsm ainjrz jigetnz, Q prlcbr mtarrs hz tnrmwam
Wagwj ugbc ssbpf, tcqaqvbr emev huoj ofcyona pvjr bm yjzr -
Cuoe bmmu ueod, ugaligtm, tsiaa, ail bsvbzcx fkfq uw yhlp
Mxibg ab pyovsvtt `Bpdjvocek.'

Khbm T stb sayotld dv targdqsk, dig tf srfwauts rpdelsnqam
Gc epj jqky cyoly qixzm rqsf uor jhxaso qsxq al hfshg'd chzs;
Gzwf hny ubxr W diy hkjvtznz, qtta um uwoq ht zifk esntnrkbt
Ue tay nulpwbf'g illqmg rvbtvl xjog zye euxp-equul uyvaomq u'rf,
Mcy ajcfk meeppt oqcywh ypndvt cvhs bmi nozv-cizbe gewogabt v'em,
Auk fvltq ttsfy, rh, gygekucew!

Huln, hmgnbirpy, xjs noi gkyh dxvgrj, dryfpurj sfzu fr wbfkvn vyysxz
Gjmbt iy Nmegcvtu blqgr lfom-zllea hvfyyld jv gnr hfnyif tyufr.
`Plptvp,' W pjwrk, `tcg Tuq vlbm pgbg zyex - vj tamgr sbtlln pr nng dmsx vvrk
Ieljttx - zsfhwgl ail akcsybmi hfbs khr gpmhzwrk cs Seiwek!
Dilnk, sj ehgwf mbts dqbq fsclnopr, gar qwwkgh gnzs eidt Embbjs!'
Dboop gnr fldjr, `Psikimhlp.'

`Pkwduwh!' fhiy Q, `gnvbr wk ixwy! - vioibpt lbwyd, ws iiml bx qsgqq! -
Ajsgnvr myxpmmf fwbg, vr rprzusc bjqrsfz kolmpd mpsr zsel anpbxr,
Rpatpchr evt tfw uglohfhrk, oi buof rpajvv zntu egwsagbsq -
Gb goin pbsr pj ptvtce nrugnpd - mmzy es gyugg, V ozdwwwi -
Kg gnvrx - cd tamfr toyt ii Ovrroo? - bjpn ar - zvle gp, I budygfr!'
Xujbu zus ciaip, `Brbvrfice.'

`Izcczsg!' zadl V, `zuwyo tj gjvr! - grhjsem ahvdz, vm bdzq ue rpdnp!
Dm gnrt Aylvxv hush olnya nhbjp cx - fa hugk Ghx he uwhu srbye -
Omyr gvta xswz jokh licrhe znvsa pf, rqgnvb epj hkggget Tcoegv,
Wg kvnsl xtnyc o dinrvsq sriwyy wawa gzs nugztf tnapl Qipcek -
Tltma a kifr sbq yayqntg alqiip, kuud tay lnzmzf fozld Gmaues?'
Bctxj huk iaoyy, `Nxdseecel.'

`Bz bugg kzzi swf foxn hz aakbway, pvyd jz sorbo!' Q xltwrqvd njdttzhvfu -
`Tlt oprk oons nrvc gnv txgaelb oav hul Ndouz'f Dwcyspwnt jhhlp!
Lxijr fc osaxs crhap ix e vcxke oy nsam twr lvl zopt uggv dxtogb!
Ykrvx gj lhvsyabrzs pvoxbypv! - vykh gnv bnme auwjr em qvom!
Bnqr hsg gicy sxfm hoe mr psnjh, nud oixk gvj ntvo teud oyz xy wwce!'
Iibah opr xnjpv, `Sixsesfrx.'

Uyd mps esjru, nzdrx sztbympu, fzzle cd sbbhvfu, faigt vy fwebnri
Ca zye iuwlbl phkh bm Pvtygf xfay edcik dy vblmumf qgce;
Hny pvy rmpa mexs nrc tay dexuway cs h dzubt'f hsiy mu rekrmbhr,
Agl huw zntp-gqtng c'pz mmo ggxvafcyg mpfbog ups npnjbk zv ylg tyufr;
Tho mr achd tevm jcg zuoe amefcj zyam ftel nzbshvug jv gnr twwtv
Uvnrc bx ftfmmr - awjrymjzr!
 
Physics news on Phys.org
I going to try it!
 
what language is it?
 
English, 18th century.

I've actually forgotten what cipher I used by now, I'll try and dig that up in case you need any more help.
 
Got it.

**** SPOILER ****

It's The Raven by Poe. You used a Veginere cipher with a 29 letter key.

**** END SPOILER ****

Thanks for posting it. I'm a little rusty, but I'd be happy to have a go at any others that you feel like posting.
 
got it, same as Bill, after the frequency test, on the first verse i got it