Puzzles

Puzzle 18

This should prove to be relatively easy, the solution will be posted next week.

- X . . . . X . . X   . . . X X . . . X .   . . . X - - - X . . 
- X . - . . X - . .   X X - . . . X . X X   . - X X . - - . X . 
- . X . X - X - X -   . - - X X . X . - X   . . . X - . - - X X 
. - - . X . . X . X   - . - . X . X X - -   - X . . - . X X - X 
. X - . . - X - X .   - . - . - X X . . X   - X . . . X X . X - 
. X - . - . X - - -   X - . . X . X - . .   X X . . - X . . . X 
. . X - . X - - . X   X - - X - - - X . -   . X . . . X . X X - 
. - . X - - - X - .   . X . X . - . - . -   X X - . . X - - - X 
- X . . . X X . - X   - . X - . . X X - .   . X . - X . . . X . 
. . . X . X . . . X   X . . . . X . - X .   . . - X . X X - X . 
. . . X . X . . X .   - . X X . . - X . .   . X . . - X . - X . 
- . . X X - - X . X   . - X - . X . . X -   . X - - . X . - . - 
. - X X . - X - . X   X - . . - X X . . X   . . . X X . - X X . 
. . X . - - . X . -   X - . - . X . X X -   . . . X . X - X . - 
- X . X . X - . X X   - . - . X . . . . X   . - X . - . X . - X 
- . - . X - X . X .   - . X . . . X 

As usual, please feel free to discuss, but be wary of spoilers in the comments.

Puzzle 17

Another puzzle for you today, this is an example of the Beaufort Cipher. I will post a solution in a week.

R D L T Y D H Q R H W S J A A R L E A O O C L Y U
U Y N J T G R I O X B L D M M V D E O U P L R A Q
E D E O X B I S P B L F T F K P L Y Y V W C Z W A
D R H M N G T N V U U Y D R H M N Z N S E C U W T
C W M J C Z L B L P C O Y D P X P B L Y U U Y N V
D E C R Z C B N D Q Q R D I Y O D E M N H C V Y O
M R I S L Y Y U G R I

Please do not post the solution in the comments, but do feel free to hint if asked. The solution will appear on one week.

Puzzle 16

It's been a while since I posted a cryptographic problem, so here is a new one. This one should be fairly simple as it's a monoalphabet

MOE FRXSTGNJ-THPED NEGSBNHMSZE HTD XEGYNHMRXJ XELRXP FSNN SB ST LHAM H ZEXJ DHTGEXRYB QSEAE RL NEGSBNHMSRT. SM GXHTMB HTJ PSTSBMEX MOE HFSNSMJ MR HPETD, XEQNHAE, RX XEQEHN EUSBMSTG NEGSBNHMSRT. MOE LXSGOMETSTG MOSTG SB MOSB: MOEJ IRYND FE HFNE MR PHCE PHKRX AOHTGEB MR MOE NHI ISMORYM QHXNSHPETM FESTG HFNE MR EUHPSTE SM QXRQEXNJ, MHCSTG HIHJ MOE HFSNSMJ RL QHXNSHPETM MR PEHTSTGLYNNJ XEQXEBETM MOE ASMSVETB RL MOSB ARYTMXJ.

Please do not post the solution in the comments, but do feel free to hint if asked. The solution will appear on one week.

Puzzle 15

Okay, it has been a while, but here is a new cryptographic puzzle:

HZ ZHZCECCZ LCXCZEF EUI, A WDAWR WITTAZMI GZHE UAL LCZE EI A THSHEADF JDHLIZ NID A WDHTC EPCF MHMZ'E WITTHE.

EPCLC TCZ JDITJESF CLWAJCM NDIT A TAVHTGT LCWGDHEF LEIWRAMC EI EPC SIL AZOCSCL GZMCDODIGZM.

EIMAF, LEHSS UAZECM YF EPC OIXCDZTCZE, EPCF LGDXHXC AL LISMHCDL IN NIDEGZC.

HN FIG PAXC A JDIYSCT. HN ZI-IZC CSLC WAZ PCSJ. AZM HN FIG WAZ NHZM EPCT.

TAFYC FIG WAZ PHDC: EPC A ECAT.

It is a fairly easy one, especially if you begin to recognise the quote. Enjoy!

The solution will appear in one week.

An additional puzzle: How was the ciphering alphabet formed?

Puzzle 13

It's time for a puzzle submitted by a reader of this site. This comes from Matthew Daly (thanks!)

A word of caution, I haven't tested these myself - it's the lack of time thing. I'm sure Matthew will keep an eye on comments.

Next week I'll post Matthew's Solution.

Over to Matthew:

I'm awfully sorry, because I've been enjoying your site for some time now and ignoring your invitation to give something back in the form of our own puzzles.

1) tgodkanrnctiwsywhsnthibai
2a) tuaetaolmgdcbrhwoaoahylon
2b) otrnwdoueoerntnasewhtnthr

I took two of my favorite riddles and encrypted them, breaking the longer one in half. I used the same transposition scheme for all three pieces, so you may wish to take twenty-five strips of paper and write the n'th letter of each piece on a strip and then rearrange them to reform the riddles. Perhaps you may also find the relationship between the answer to the riddles and the encryption technique.

For people who need a little guidance, here is a hint in a much more familiar cipher:

D NQRZQ SODLQWHAW DWWDFN ZRXOG EH IUXLWIXO,
KRSLQJ WR ILQG FRPPRQ ZRUGV LQ WKH ULGGOHV.
IRU LQVWDQFH, RQH RI WKH SLHFHV FRQWDLQV
WKH ZRUG 'BRX', 'DQG' LV LQ D GLIIHUHQW
RQH, DQG WKH RWKHU KDV 'GRHV'.

As usual, a solution will appear on one week.

Puzzle 11

Puzzle 11 Picture

Today's puzzle is in the form of a picture (don't try to solve it by guessing the URL of the answer graphic, the answer is not in picture form!)

It may look daunting, but it should be reasonably straightforward in nature.

As usual, a solution will appear next week.

Apologies to people using screenreaders - sorry that this puzzle doesn't lend itself to that format.

Please don't spoil the puzzle by posting a solution. Post help, by all means - but be circumspect.

A solution will appear in one week.

Puzzle 10

This should be quite a straightforward puzzle, I thought I'd throw a bone to those people who got completely stuck on the previous ones!

R'OD ITDHK TEXK WQ KWVEN AWRHA KFXWYAF IWUD WQ
UN AXEHVEV'I TETDXI. KFDXD RI E SWK WQ UDUWXEBRSRE
RH KFDXD, EHV R KFWYAFK R'V TDXRWVRPESSN TWIK IWUD
WQ RK WHSRHD, ESWHA LRKF EHN IKWXRDI LFRPF EXD
EIIWPREKDV LRKF KFDU

Please don't spoil the puzzle by posting a solution. Post help, by all means - but be circumspect.

A solution will appear in one week.

Puzzle 7

I hope you enjoy puzzle 7. Don't be put off, it's not as bad as it looks!

Actually, it's very easy indeed!

1010100 1101000 1101001 1110011 0100000
1101001 1110011 0100000 1100001 0100000
1101101 1100101 1110011 1110011 1100001
1100111 1100101 0100000 1110111 1101000
1101001 1100011 1101000 0100000 1101000
1100001 1110011 0100000 1101110 1101111
1110100 0100000 1100010 1100101 1100101
1101110 0100000 1100101 1101110 1100011
1110010 1111001 1110000 1110100 1100101
1100100 0100000 1100001 1110100 0100000
1100001 1101100 1101100 0100001 0100000
1000001 1101100 1101100 0100000 1001001
0100000 1101000 1100001 1110110 1100101
0100000 1100100 1101111 1101110 1100101
0100000 1101001 1110011 0100000 1110100
1101111 0100000 1100011 1101111 1101110
1110110 1100101 1110010 1110100 0100000
1101001 1110100 0100000 1101001 1101110
1110100 1101111 0100000 1000001 1010011
1000011 1001001 1001001 0100000 1100011
1101111 1100100 1100101 0101110 0100000
1001001 0100000 1100100 1101001 1100100
0100000 1110100 1101000 1101001 1110011
0100000 1110101 1110011 1101001 1101110
1100111 0100000 1100001 0100000 1110011
1110000 1110010 1100101 1100001 1100100
1110011 1101000 1100101 1100101 1110100
0100000 1100001 1101110 1100100 0100000
1101100 1101111 1110100 1110011 0100000
1101111 1100110 0100000 1100011 1100001
1101100 1100011 1110101 1101100 1100001
1110100 1101001 1101111 1101110 1110011
0100001 0100000 0100000 0100000 0100000

Please don't spoil the puzzle by posting a solution. Post help, by all means - but be circumspect.

A solution will appear in one week.

Puzzle 6

Guvf vf na rknzcyr bs EBG guvegrra. Vg vfhfhnyyl glcrq jvgu ahzoref, ohg V nibvqrq guvf gb xrrc guvatf nf
grkg.

EBG guvegrra vf n gevivny Pnrfne Fuvsg. Vg vf dhvgr bsgra hfrq nf
'fcbvyre cebgrpgvba' va hfrarg arjftebhcf.

Sbe rknzcyr, vs V unq whfg frra n svyz gung V jnagrq gb qvfphff
ba n arjftebhc, ohg abg rirelbar gurer jvyy unir frra vg, V
jbhyq nccyl EBG guvegrra gb zl cbfgf. Rnpu yrggre vf fuvsgrq
guvegrra cynprf, fb N orpbzrf A, O orpbzrf B naq fb ba.

Jr fubhyq frr gung nccylvat EBG guvegrra ntnva oevatf hf onpx
jurer jr fgnegrq. N pynffvp rknzcyr juvpu qrzbafgengrf gung
nccylvat n zbabnycunorgvp fhofgvghgvbaf znal gvzrf bire qbre abg
vapernfr frphevgl!

Znal cvrprf bs fbsgjner sbe hfrarg unir n EBG guvegrra shapgvba
ohvyg va.

Puzzle for Discussion

Puzzle for Discussion

This graphic is a little puzzle which I'm 'throwing out there' for discussion. It is a simple little cryptosystem. If you have any thoughts about what the system is, or how it might be broken, please comment. Even if your thought turns out to be wrong, it may spark an idea in another person.

My apologies that this puzzle, by its nature, is not accessible to people using screen readers or non graphical browsers.

This is not one of the regular weekly puzzles. A solution does exist, but I won't put it out there until I feel the time is right, which may be never!

Puzzle 5

This is a Vigenère cipher. Key known to be less than 10 letters. Don't be put off by the length of the text. If working manually, use as large a fragment as you can deal with. More text means more redundancy which you can use.

ZLSYO KNGCE ZVGGH ZTKVE FKOIY QOPGX GRMKO QKEUI
KIZSS EZVAW HKUET SFXGR ODOKO STAVZ ILUJT VXWGP
ZXAEX EBKKI YSTZS TGVHZ GPOXM RTHKJ TZIEI CHYKH
AXWVY MTGID HITXC EZLKT FFZII XWEMT UASIY FEZWI
ZYKST KNIVV SJKRZ GCEBI TXWFT ANIBG XMYSB VXWUJ
KRXHU RCKHI TITZZ SXGSR YIZSP VTILM HEUQG XHVXJ
UVKYG XXIOJ URHCH YKEIX WMOXO IGFLE VVCKK GZMBX
VSCIF FXSLE BFXKG RWQGX OSBGX SBMRV JJUVW EZLKJ
WIYXV EFRMV GTVRH SBIHY KHKXO ZTMTK DFCIX WVRRP
XIELK WZEBV AXXEZ JZEZI CIYYI LOEUV MEBZF EZMCE
ZSARR VXXGO SKNIL YBTZM URGGK VLSFD KHARR VXXNI
DIKWK RHTUR BIBKO STFMR VVUXS TZMTK DFCIX HSJOK
TEHVJ FEXVV VEXXW VYXUE QFTJR MQKOJ VVCKK GZMCE
IETRC KHIGV FRTKK HOTIS XHWEM PEXVV JIZEW EORMT
CNKVY LOCRV KUIVY XUVGY GPREQ TKTZW ISPII XHFZL
KTFFB MYMCE YSLXV ZYEXX WTRIZ LSFLJ KVCWZ LKWSI
BMIIG FLENY ARTMZ EFZGR UVURT MFEHZ URYYQ YGWZL
SZTXK VBRZM UROCI SSQWK ZIKST KNIXI RTXSY WHFGW
YYAVZ LKLID GROXO IOETJ IEIXO SBJVI XJCIS IJFMG
XSZIQ KORMT CNKVY YBUKV ZLSGX IYIBK ISTZS EZMUR
OEERK YHIGP VSKVX SXEBP UVMEB ZFEZM CEORB MHVJF
EXVVV SCIFT URIIF EKHUV CWLIX MBXOX YIZWL SXXVV
YIVYF GUWKW GYGPR FSIKU AMFVJ XUEQK CMZLO JKRYI
CWXIY TCEYM HMZZZ CZSKR XHYXV VVEXX MKUXN IQFTJ
RMQKU RCLWT NTKVG FTWVV CKKGZ IRSEX NIDIK WKRHT
URBIB KOSTH SGKRJ EBUYL GPZSK VKUIZ XIJXC WAVTM
GYYYL JWTOI TXOJY YXEBT KWZLO KOXOW WEGTU WWKOS
TXCLT HKVHR QIZLS RVTXS DIOEZ ITLTG ZMCEY ETHHF
JMYGV RXKKX VVSMS TOIZM GPZPT SJIFF MEZMC ELVUQ
HYKTX IQVJM TKDIU ZOWWF TWYLO CRFKQ OUKFE WDVIM
GPOXX IKQSE ZWHIH NKITT CNKVY SBVUJ CLWTN MYVSJ
ZVOGH VJIBI BKKQV SFRXM RCWEO XYJFV KHUQH FTIMS
HZGXK AWKNX NICKN IXTCN KVUVW KYERP WVYFE VSRYS
TSTDO POXOI EIBIB KYQUV SGGVZ MQLRE XPMNN IXIHY
KANSZ VUVGW ISYXG RHZGP VEFKU JZLSK KVXMH FXCUJ
HYKWG MRGUA KVWJU GIYDZ KHCLS EKZKV WEZLK TFVYI
TXQFT ZKRHZ URSIB KOSTM GDGHK STRVV UXSTZ MTKDF
CIXWI TNQKR HZURG TDCOI YXCJA FYXWK AXKSF XGROD
OKOST WWEZL KWSEY IUJHY KTXIG VTXGV HZIPK

Please don't spoil the puzzle by posting a solution. Post help, or requests for help, by all means - but be circumspect.

A solution will appear in one week - so I won't be providing help :)

Puzzle 4

This is a Vigenere cipher. The keyword is FIVE letters long.

PEFDN FIUQC UCRJD PLXTK FLJFJ TYHWC UGJXQ BAJXR
ICXTL FQFXY WCLJL FLJYM QLTHC FXDTS TBTZJ EBFAC
UUPJL FPJWW GCKYF MYYYC SIKYF FWNUF FLYJV UCYTJ
ESTZR IUYYF FEJDU BMKNT FFJYR FLXQM OADTS XIZQB
IUAJR IYSIM OYFKP FKZJL DSHTS ONNSM SXJWR PYXYY
CFNXF IIBRS DBJAC SSKND UBQJR UYWMY EVJJL DUJXY
SMMND UYIDM VQTZJ EBFAC UBJSS OMMND UYIYF FFJYR
FLXFL ELJHM OMYWS DNJIR IYRJQ TULJR IYPJW CSYMC
XUDBY TVZKD Z

Please don't spoil the puzzle by posting a solution. Post help, or requests for help, by all means - but be circumspect.

A solution will appear in one week - so I won't be providing help :)

Readers' Puzzles

I've now prepped up to puzzle 6. If you would like to write a puzzle for this site, please feel free. I'll credit any that I use. You should send your puzzle (with a solution, including a note on how to crack the code) to mark_cryptopuzzles (at) murky (dot) org.

The rules are simple, it must be a reasonable puzzle (no one time pads!) and it must be based on a cryptographic method already published on this site. It also must be original, please don't crib from a puzzle book.

Note that if the method used doesn't exist as a post on this site, that's fine - the situation will have to be remedied before the puzzle is published! I'm not sure how many I'll get (if any), but fingers crossed.