Passcode Decoding Walkthrough #008.1 Jojo’s Word of the Day 2014-06-27

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Decoding Tools

http://tools.decodeingress.me/

http://decodeingress.me/tools/

The format for this passcode is: [2-9][a-z][a-z][a-z][2-9]keyword[a-z][2-9][a-z][2-9][a-z]

Difficulty Rating: (out of 8. 1-5 are regular difficulty levels, 6-8 are very challenging):

Source of document:

https://plus.google.com/u/0/+JoJoStratton/posts/W7upEaRaeVR

https://googledrive.com/host/0BwXDFMPXURDAbzhTYkR2MDEwNEk/APEP.html

How/where to find the source of the passcode:

With Jojo’s Word of the Day, you usually check the source code of the HTML document to uncover the puzzle to solve. Looking at the end of line 3 in the source code

BKBTLTYTKLKTMLLLKTLTKFATFOYK

Methods/Process:

Looking at a frequency table for the characters does not provide much help:

Character Number of Hits
A 1
B 2
F 2
K 6
L 6
M 1
O 1
T 7
Y 2

 

Looks like we’ll need to find what these letters correspond to before proceeding further.

What doesn’t work is breaking up the string into pairs and trying to reverse engineer a solution:

BK BT LT YT KL KT ML LL KT LT KF AT FO YK

This technique will be fully introduced in a tutorial in the near future. In the mean time, assuming the pairs follow a pattern, KT ML KK KT (or TK LL LM TK) would correspond to the keyword part of the passcode, BK YT KF FO (or KY TL TY TB) would correspond to numbers. Unfortunately this will not work.

 

Passcode solution:

Starting in mid June 2014, JoJo’s Word of the Day codes usually follow a theme for about a week and this week the theme is space (specifically stars/Messier Objects). Doing a search for astronomy and individual letters:

stars "A" "B" "F" "K" "L" "M" "O" "T" "Y"

(individual letters are in quotation marks to prevent search engines from combining them)

The results should indicate Stellar classification and as an example, we will be using the Wikipedia entry:

http://en.wikipedia.org/wiki/Stellar_classification

For this example, we don’t need to gather our data in a table because the characters we needed to look up (and G) are ordered differently than in the alphabet.

O B A F G K M L T Y

There are 10 letters in the classification so we can assume they correspond to the numbers 0 to 9. Doing the conversion:

1518789857586777587853283095

Going back to our frequency table with new values:

 

Character Number of Hits
A=2 1
B=1 2
F=3 2
K=5 6
L=7 6
M=6 1
O=0 1
T=8 7
Y=9 2

 

The 3 letters with the most hits are K=5, L=7 and T=8, which leads us to believe this code will be converted from Decimal to ASCII as the last step.

With trial and error and playing around on the Rumkin website, you will eventually find that Railfence is the proper approach.

Running 1518789857586777587853283095 through railfence decrypt with 3 rails:

1835572518868737770588979855

Reversing the result and pairing it up:

55 89 79 88 50 77 73 78 68 81 52 75 53 81

Converting from Decimal to ASCII:

7YOX2MINDQ4K5Q

Passcode items gained:

300 AP
200 XM
L1 Resonator (1)
L8 Xmp Burster (2)
Portal Shield (2)
Heat Sink (1) (Common)

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Passcode Decoding Walkthrough #008.1 Jojo’s Word of the Day 2014-06-27

by Jack Truong (SQL) time to read: 2 min
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