## On the Subject of The Inverted Green Cipher

It ain’t easy being green. Nor is it easy being a cipher.

On the module, you will see 3 screens, a keyboard, 2 arrows, and a submit button that displays the current page you’re on.

Pressing the right arrow takes you to the next page. Pressing the left arrow takes you to the previous page. There is a total of 2 pages.

On page 1, the top screen shows a 6 letter encrypted word, the middle and bottom screen shows a 6 digit number.

On page 2, the top screen shows a 3 letter configuration, the middle screen shows a word.

### Step 1: Homophonic Cipher

Config the table below so that the lowest value in that row is underneath the letter that is shown on the top screen of page 2. Ex: KGO means that 01 is under K, 27 is under G, and 53 is under O.

ABCDEFGHIJKLMNOPQRSTUVWXYZ
0102030405060708091011121314151617181920212223242526
2728293031323334353637383940414243444546474849505152
5354555657585960616263646566676869707172737475767778

The numbers on the middle and bottom screen of page 1 is an encrypted word using the table you made.

Treat the middle screen as the tens place of each number and the bottom screen as the ones place of each number.

For each number, find them in the table and use the column of the number to get the letter that is above the rows of numbers.

You should now have a decrypted keyword that will be used in step 2.

#### Example

Middle Screen Numbers: 407271
Bottom Screen Numbers: 883720
Homophonic Key: KGO

ABCDEFGHIJKLMNOPQRSTUVWXYZ
1718192021222324252601020304050607080910111213141516
4748495051522728293031323334353637383940414243444546
6566676869707172737475767778535455565758596061626364

48 -> B
08 -> R
73 -> I
27 -> G
72 -> H
10 -> T
Decrypted Keyword: BRIGHT

### Step 2: Mechanical Cipher

Using the keyword you decrypted from step 1 and the encrypted word from the top screen of page 1, follow the steps below.

Take the first letter from the keyword and use that as the row.

Take the first letter of the encrypted word and use that as the column.

The intersection of the 2 letters will form a new encrypted letter.

Do this for each letter of both words to get a new encrypted word.

#### Example

Encrypted Word: HNXXYS
Mechanical Keyword: BRIGHT

B + H -> K
R + N -> U
I + X -> J
G + X -> B
H + Y -> X
T + S -> E
New Encrypted Word: KUJBXE

ABCDEFGHIJKLMNOPQRSTUVWXYZ
AUFHKQIPLXNZESGBVMCWJRDOTYA
BIWCZYMLKJODGFSQRNBTXHUEVAP
CWBSMEJTUCPFAHZOQLIKNYVGXRD
DGRINQVWOTYAJXBMHCFKLDUSZEP
EDLTVSUIKWCXRFJZANYHMQOGEPB
HBPHORAKNUETDZYQIMSFJGVWCXL
IANDSQWTGXKFPCOVBLMYEZHRJIU
JAQJPBUSGWNXZVDYLETCOFHRIMK
KBHFTDGERXJAMUNZVYKOSPILCWQ
LJHUKDMSNEBICZYWLXQFPORTAVG
MASNTZDBGWYILEORCQFXJPKHMVU
NRPCQABVLGWFENIKYMDUTSJXOZH
OYIXNVWQSUHFOMZDGKJPCTBELAR
PIMPCZLEGJARNTWSYFQDOUBKHVX
QJGKOXMUBAVRTFYCNPWQZESILHD
RSVHDBZNMKWJIEUYFXRQPLGCATO
STZXGOPNBWAIYRHQLVKJSCDUEFM
TDJQZYWTPKIXCVABFNUEOLHSGRM
UCJOEDYHBNIXZRTPWGALFKUSMVQ
VFEHLYOBGRXQKVZUIMJTNACDPSW
WMOGAPTHIZXRFKLYSVDBWUQNECJ
YZJVWFBEOTKRDHSCPIGQNAYLUXM
ZVWFXUEKRLBQTMCHSGJOZYDAPIN

### Step 3: Ragbaby Cipher

For this, you’re going to need the encrypted word you got from step 2, and the word on the middle screen of page 2.

Using the word from the middle screen, remove any duplicate letters from it, getting rid of all 2nd or more occurrences. Next, take the entire alphabet and remove all the letters that are shown in the key.

If the number of unlit indicators is even, put the alphabet at the end of the key.
Otherwise, place it in front of the key. This will be your Ragbaby key.

Starting with an offset of 1, follow the directions below for each letter:

• 1: Find the letter in the Ragbaby key.
• 2: Go to the right a X number of times where X is the offset.
• 3: Replace that letter with the letter you end up on.
• 4: Add 1 to the offset.

After that you should now have a decrypted word.

#### Example

Encrypted Word: KUJBXE
Ragbaby Key: BCDFGHIJKLNOPQSVWXYZMATURE

K -> L
U -> E
J -> N
B -> G
X -> T
E -> H
Decrypted Word: LENGTH

Once you finally have your decrypted word, you can submit it. Once you start typing, all the screens will go black and the bottom screen will show what you are typing.

To clear it, just click one of the arrows. This goes to one of the pages and clears any input you put in. It will not let you go over 6 letters on input.

Once you are satisfied with your input, press the button labeled "SUB" to submit your answer. On a strike, the module will go back to the first page of the module, but it does not regenerate.