Crypto challenge 12: *ANUEGO THKV* PZNUSOA QM TYH WQQ

EBHSX REVFT FEAIQ EROPW TGYBP PHSNH ASROD HLZDT KBEUO RVVOQ UETRZ MARVD GQMGY DOTDD KRADD RPFDI KLVQC MSHLV BIQBV LJORO CYALH NCHOA SHRQW EDEBF KCKDK KEAAE KKANH RJWKV DTFEN MZKKK WBAAI UEMQT FJABS HVSKQ MTJGA KQYGW PPDBF RGMWT IDYBD NTLLP DRVGX MKOND JLOOJ WPPDS LUJIL EFIPP DALWD WQTEU

75      45      61      08      09      76      78      03      38      69      88      74      09      51      78
03      17      04      50      41      77      96      25      14      53      03      25      73      42      78
64      42      92      70      32      13      42      13      78      98      98      41      57      97      88
96      85      88      42      93      78      78      64      61      61      54      57      59      75      40
25      50      14      61      73      98      90      75      92      42      87      55      23      67      26
69      42      04      08      14      45      42      07      65      24      41      67      25      98      62
21      87      83      23      67      09      50      25      31      03      89      21      46      29      65
77      44      89      08      61      73      85      95      48      55      13      14      46      48      67
86      15      78      14      64      42      02      76      89      38      78      10      29      61      13
13      51      29      89      70      01      14      45      42      34      46      97      88      70      97
61      16      25      76      83      13      04      88      89      09      62      31      03      25      92
98      32      30      61      29      85      93      13      89      41      65      78      32      71      64
93      63      92      61      12      85      08      60      45      46      63      03      42      12      15
97      75      65      06      65      14      81      38      74      85      75      78      64      61      33
25      29      83      31      70      10      70      43      31      03      42      40      55      87      67
98      69      89      21      97      24      14      92      89      76      25      65      75      73      89
07      85      93      97      61      60      57      69      24      17      21      77      40      57      29
76      46      61      88      49      46      67      61      30      21      69      41      49      93      67
42      77      38      17      21      19      85      74      42      85      13      93      67      19      38
30      36      70      32      40      70      32      06      88      59      57      76      12      36      38
01      61      21      14      64      89      73      93      75      81      85      77      80      42      73
36      60      38      73      66      57      50      41      14      45      89      34      04      08      24
64      09      53      48      42      24      64      09      73      12      46      39      06      83      38
73      70      15      08      41      64      25      12      39      51      75      88      09      73      26
78      92      36      62      09      79      50      60      30      64      61      81      85      30      29
04      41      46      50      91      28      51      93      78      61      89      57      30      65      67
83      38      01      14      89      29      31      45      89      43      93      76      13      31      62
61      17      34      45      65      12      06      74      85      12      26      51      50      24      21
69      60      26      08      89      09      75      92      42      76      14      46      07      42      81
92      25      69      75      45      89      64      70      51      77      25      75      93      71      10
42      88      22      21      88      67      55      77      03      61      62      89      06      31      21
30      04      43      13      92      61      17      25      76      42      22      25      65      08      44
76      70      87      94      25      88      91      25      50      14      67      83      06      93      47
89      21      58      57      22      55      65      08      38      23      73      38      24      06      25
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KelvinYAsked:
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KelvinYAuthor Commented:
I'm going to jump in quickly this week, because this one is a real toughy. The title and instructions are encoded in a scheme that we have had in an earlier challenge. They both use the same (<10 chars) key. The asterisks in the title represent non-alphabetic(punctuation) characters and may be safely ignored.
maramomCommented:
Hoping the barrier won't be broken yet this time!
KelvinY, I have decrypted the instructions, but am puzzled with the title. I find the title jumbled when using the same key as the instructions. Is it something I'm doing wrong, an encryption error, or perhaps it's intentional? Repeating and shifting the key yields the last four words, but not simultaneously. Haven't hit the *ANUEGO THKV* part... but perhaps solving the full cipher will clear it up.
KelvinYAuthor Commented:
maramom,

When you are decoding the title you still need to take the positions of the asterisks into account. Even though the characters that they represent are not significant they are still taking up space in the text.
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maramomCommented:
Thanks---why didn't I think of that? My tool ignores them whether they are there or not...using a letter to sub the * does the trick!
KelvinYAuthor Commented:
We've had a few days without much sign of activity, so I think it's time for a clue.

I'll start by stating the obvious, most of which should have been figured out. The title and instructions are a Vigenere cipher with a 6 character keyword. The main cipher is one we have not had before. The plaintext is in English and is an extract from a book that is publicly available ( http://www.gutenberg.org/ ). The first two words of the title give a clue to the type of cipher.

I'll give it another day and then reveal the name of the main encryption scheme.
Enabbar OcapCommented:
I had guessed the cipher type from the ct you have provided. Confirmed now I have been able to read the instructions - don't know how that slipped past me as I had tried a Vigenere, read them now and counting....

maramomCommented:
Baum

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maramomCommented:
LOL--- I was convinced "*Sounds like* trouble in the air" meant:  TRIBAL INDIA, which would lead to the book. Thanks for your last clue... I was stuck in an endless pursuit using the Vernam XOR!
Once again, Great Puzzle!
KelvinYAuthor Commented:
Great work, maramom. The points are yours and I will assign them after leaving the question open for a short while longer. It looks like the one week barrier is still to be broken. Please post a brief description of how you cracked the code, if you have the time.

This week's cipher was an ACA Homophonic cipher. The title and instructions were encoded using a Vigenere cipher with a key of WIZARD.

The full messages were

Crypto challenge 12: "Sounds like" trouble in the air

It is going to be a real toughy this week. Some pretty impressive code breaking has led to every challenge thus far being solved in less than a week. Could this be the first one to break that barrier? To get the points, decrypt the book extract enciphered below and post the surname of the author. [VIGENERE]

The north and south winds met where the house stood, and made it the exact center of the cyclone. In the middle of a cyclone the air is generally still, but the great pressure of the wind on every side of the house raised it up higher and higher, until it was at the very top of the cyclone; and there it remained and was carried miles and miles away as easily as you could carry a feather.

It was very dark, and the wind howled horribly around her, but Dorothy found she was riding quite easily. After the first few whirls around, and one other time when the house tipped badly, she felt as if she were being rocked gently, like a baby in a cradle. [ACA Homophonic]

The extract was from The Wonderful Wizard of Oz by L. Frank Baum, available on Project Gutenberg ( http://www.gutenberg.org/etext/55 )

The current points totals after this challenge are as follows:

maramom    1550
RobinD     825
Infinity08 175
NicoLaan   100
Galisteo8  75
JR2003     50
snoyes_jw  50

maramomCommented:
To crack the Homophonic Cipher, I did a frequency analysis of each two-digit decimal. I then made FOUR (the key, BTW) columns with the consecutive decimals, along with the frequency of each: (01-25, 26-50, 51-75, 76-00). Starting with 01-25, I saw no occurences of 05, 11, 18 and 20. I decided the corresponding letters would likely be Q, X and/or Z. Using 18-19-20 as X-Y-Z looked good after popping in the remaining letters because the frequencies were all in line with ETAIO SHRNDLU. I used the same approach with the other three columns, substituted my derived letters for the cipher numbers, and VOILA!
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