The Twenty Doors (ROOM 10)

Question

This is part of The Twenty Doors series.
The previous one is The Twenty Doors (ROOM 9)

There is some paper taped to the door in Room 10:

Well done! You are now halfway! To mark this event, this cipher is EXTRA hard!

- ???

You then look at the main paper

PART ONE

To decrypt the first cipher, I've given you a mathematical equation:
$d(x) = a-1(x - b) \mod\ m$
a is 11, b is 25, and d is the decrypted text.

Izea ahx lprp z cjrqg hjay mx rdrp, kla ja pazeap hjay nexmp.

mmking solves it without dying, so you get to Part 2:

PART TWO

Everyone loves a mime. MDEwMDEwMDAwMTAwMDAxMDEwMTAwMDAxMDAwMTExMDAxMDE= The other key is key. Wmb wmmuh, drh imqfo tdvw ubonbv lcfkmod rr d vdqirp vrzugb isu bbd jbqbvdwmsr, fqh nv kmvwxfooc xrgudgbdgoc. Jr wr qc kbgwnwb, kmwmx pc rdpb. Wmbub, csx empo imqi wlb frwkbv.

PART TWO - HINT ONE

'My name' refers to something recent in The Twenty Doors series, but not this part. Go back through each one, see if you can find something useful...

As requested, here is the contents of the site page.

My name again. J2I. Pga torooapr fpi Rlis Mcrcl ym otmplx tv Gsic 10. Iepzve aud hb, cap pbqi hb dnui ub. Befud. I hate vowles, exept for i.

PART THREE

CodeNewbie is still working on getting at the password, but here is the ciphertext:

Irrt sthcgma

Also, like magic, a keyboard appears, with the letters A to Z on it!

PART 3 - HINT 1

! Spinny! @HHF G L\NFHP301 3@WDXECT R1T0||0T GTFDHPSRX5R 3ARHCU/ £A NT S0! If you can be bothered to decode that, you've then got to work out my L3etspeak. :) It's Markdown O'clock!

PART 3 - HINT 2

L3etspeak is usually written with two three's (L33tspeak). So, what could that three mean???

There are going to be three separate parts to Room 10, thus it is a semi-interactive puzzle. The next part will be added when this door is solved!

Maybe you could give a hint for the second part... I've tried going to your site /Kslkgh /george /gibson /my_name /georgegibson with a few different extensions (php, html, htm) and also without extensions and came up with nothing... Also couldn't find suspicious looking links in it's html source code... — Davide, Aug 05 '15 at 08:47
@Davide This name has only been coming up recently, and only on puzzling. Look back through The Twenty Doors. — , Aug 05 '15 at 08:55
Your "Contact George" page returned an error when I tried it. — LeppyR64, Aug 06 '15 at 11:00
@LeppyR64 Damn, sorry. Mistake in my programming. Should be fixed soon. — , Aug 06 '15 at 13:34
@Kslkgh That doesn't look like a web address to me. Was I confused about the clue? — LeppyR64, Aug 07 '15 at 21:05

score 4 · Accepted Answer · edited Apr 13 '17 at 12:50

4

The OP added the following sentence in this comment:

Here's a hint, because I'm getting bored of waiting:
ahhltomot eiXect fcu eutnsr ee lnfhqso SPUN THREE TIMES!

This is a 3 column transposition cipher. After some manual adjustment, this decodes to:
Search the left column of the question

Part 3, Hints 1&2 - This is also a 3 column transposition cipher. After some manual adjustment and translation from Leetspeak, this decodes to:
Search the far ~~right~~ left column of the page to find the password

Part 3 - Based on the hints: "all up, not down", "left column", "(markdown) format read", "except for lines that are >Quoted or >!Spoilers", "eleven characters (not a word)", and "forget the stars", the password is:

pTCPAPmYTTT

Final Answer - By subtracting this password from the ciphertext (irrt sthcgma), the final answer is:

type seventh

edited Apr 13 '17 at 12:50

Community

1

answered Aug 16 '15 at 02:34

Len

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Reach should be read. Sorry. – Aug 16 '15 at 06:22
This hint is for a different question, isn't it? – Davide Aug 18 '15 at 11:06
@Davide Nope, the hint is for this question. – Aug 19 '15 at 06:41
@Len Your getting warmer. Try broadening your search along that column. – Aug 19 '15 at 06:50
1

Maybe you could TRY typing in PACNTRT – Davide Aug 20 '15 at 16:35
@Len Your still not searching broadly enough... – Aug 25 '15 at 07:37
@Len The word 'Spinny' in the first hint is a hint to the cipher used. As for the 3, once you know the cipher, that will become clear as well... – Aug 26 '15 at 06:26
@Len Traceback (most recent call last): In hint-1(): TypeError: Far-Right should be Far-Left. Sorry about that. To make up for it, have another hint: it's not just the capitals in the column that are important... – Aug 27 '15 at 07:22
@Len There are eleven characters (not a word) in the password. – Aug 30 '15 at 06:43
You are VERY close! Forget the stars - you can include the bottom two lines! .si ecnatnes siht tahw ti ot od ot deen tsuj uoy neht tuB – Aug 31 '15 at 08:00
@Len Still not quite there, so here's another cryptic hint... Let's play at the fair! J2O is a great drink! Unlock the alphabet! Tdbqlm rmb ckmz ecocfl cm pmb pndtsmcl, kqbqp mslt zgbq zimlm odo pilnoi sqalsk. Bdd ygdd dkuctm uokbq xmbo wcn tbbe rmm TB.Y. Once you've figured that out, it will be a lot easier... – Sep 05 '15 at 07:10
@Len The Mark Down isn't the important place to search. That hint is just referring to the lines that should be ignored. You've obtained your current hint in the correct manner, but try the normal page instead. As long as you ignore the lines with an ignore direction in the Mark Down, you should have the hint! – Sep 06 '15 at 06:42
@Kslkgh - Ok, I think the revised answer (above) is now correct ;-) – Len Sep 07 '15 at 05:55

score 3 · Answer 2 · edited Apr 13 '17 at 12:50

3

Part one

Using an

affine cipher with a = 11 and b = 25,

the text decodes to

Part two uses a field with no eyes, but it starts with grons.

So part two will use a

grons + field - i = gronsfeld cipher

Part two

Converting MDEwMDEwMDAwMTAwMDAxMDEwMTAwMDAxMDAwMTExMDAxMDE=

from base 64 to ascii

gives you

01001000010000101010000100011100101

Using this as the cipher key and "key" as the alphabet key, you get

The third, and final part relies heavily on a random source for key generation, and is virtually uncrackable. Go to my website, visit my name. There, you will find the answer.

CodeNewbie got the next piece. Looking at the website and decoding the string of text found there, you get

The password for Part Three is hidden in Room 10. Search all up, not down to find it.

Looking up at the question and searching in the markdown, there's a line commented out that says

ignore this line

Not sure of its significance however...

edited Apr 13 '17 at 12:50

Community

1

answered Jul 31 '15 at 18:38

mmking

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Correct! Part two will be here soon! – Jul 31 '15 at 19:08
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Finished part two. – mmking Jul 31 '15 at 19:19
No, you haven't quite yet. Have you not taken the advice from your decryption? – Aug 01 '15 at 06:51
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@Kslkgh I believe mmking has gone as far as required. Requesting a user from StackExchange to visit a third party website to solve a puzzle seems like it would be out of the scope of puzzling.SE. (For both computer safety reasons and site policy) – Mark N Aug 06 '15 at 17:04
@MarkN The contents of that page are now posted. – Aug 07 '15 at 06:23
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Is the latest revision important in any way? – mmking Aug 15 '15 at 14:17
@mmking Yes it is. GitHubFormatReadToFindSomething!Boring :) – Aug 16 '15 at 06:23
@mmking BIG HINT Anything I add to the puzzle, except for lines that are >Quoted or a >!Spoilers will change the password for part three. – Aug 17 '15 at 07:03

score 3 · Answer 3 · edited Apr 13 '17 at 12:50

Part Two:

Using the plaintext provided from the site,

My name again. J2I. Pga torooapr fpi Rlis Mcrcl ym otmplx tv Gsic 10. Iepzve aud hb, cap pbqi hb dnui ub. Befud. I hate vowles, exept for i.

We need to break up this text to arrive at a solution:

My name again.

This points to the name 'Dr. X' that the OP used for himself in Room 8.

J2I. Befud.

This tells us that the encrypted text in between uses a Bifid cipher with J converted to I. So decrypting the encrypted text with the translation 'I to J' and 'DRX' as the key gives us

The password for Part Three js hjdden jn Room 10. Search all up, not down to fjnd jt.

I hate vowles, exept for i.

Using this clue, we get the line

The password for Part Three is hidden in Room 10. Search all up, not down to find it.

Still working on the riddle...

Isn't there usually a keypad with some characters where we have to key in the answer? I don't see anything in this room. — CodeNewbie, Aug 07 '15 at 07:29

score 1 · Answer 4 · edited Apr 13 '17 at 12:50

1

Part 2:

Decoding the first message (MDEwMDEwMDAwMTAwMDAxMDEwMTAwMDAxMDAwMTExMDAxMDE=)

with base 64

We get:

01001000010000101010000100011100101

Which is the cipher key for the Gronsfeld cipher (see mmking answer). The other key is "key"

So the second message decoded is:

The third, and final part relies heavily on a random source for key generation, and is virtually uncrackable. Go to my website, visit my name. There, you will find the answer.

edited Apr 13 '17 at 12:50

Community

1

answered Jul 31 '15 at 19:18

TroyAndAbed

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Did you finish this before mmking? – Aug 01 '15 at 06:52
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I think so. Like one minute before (max) – TroyAndAbed Aug 01 '15 at 10:31
So, you did this in at most 30 minutes, and mmking in 31 minutes. Noice. – Klyzx Aug 04 '15 at 17:10

score 1 · Answer 5 · answered Aug 07 '15 at 15:47

1

Searching this room for all up and not down, as the last riddle suggested, I'd say the password is

EXTRA which is in all uppercase letters in the original piece of paper

answered Aug 07 '15 at 15:47

Davide

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Sorry, but it's not that. – Aug 09 '15 at 07:34

The Twenty Doors (ROOM 10)

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