Passcode Decoding Walkthrough #012

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On September 1, Stein Lightman announced his discovery of 2 new glyphs: call and response, which together make up signal.

We find there are 3 codes to be decoded in the images provided.

All passcodes will be in the format:

[2-9][a-z][a-z][a-z][2-9]keyword[a-z][2-9][a-z][2-9][a-z]

Signal (Difficulty: 2/5)

Signal

The code is displayed in braille and the transcription is:

wj2w5dtnirresie9zeh2y

There are 21 characters in the code, 21 can be broken up into 7 rows of 3 charcters or 3 rows of 7 characters:

wj2
w5d
tni
rre
sie
9ze
h2y
wj2w5dt
nirresi
e9zeh2y

The 7 rows of 3 characters can be read right-to-left top-to-bottom to give us:

2jwd5winterreisez9y2h

Winterreise is in the keyword position of the passcode but needing a keyword substitution. A quick search tells us that Franz Schubert composed Winterreise. Schubert is a known keyword.

2jwd5schubertz9y2h

Call (Difficulty: 2/5)

Call

5i7d6j7c5b8g7f8d6e7i8j7e6j7a8f5c8f5j6f

Trying a..j = 0..9 and converting pairs from decimal to ASCII:

58 73 69 72 51 86 75 83 64 78 89 74 69 70 85 52 85 59 65
:[email protected];A

That doesn’t look quite right, examining the pairs of characters closely:

57675 878678767 85856
83921 653489490 52595

The numbers in the first line correspond to the correct range for the numbers 2-9 but some values (58 and 59) are too high to be numbers. However, reversing the second line would line up the pairs to match the decimal range for numbers 2-9

57675 878678767 85856
59525 094984356 12938

Converting the pairs from decimal to ASCII:

55 79 65 72 55 80 79 84 69 78 84 73 65 76 81 52 89 53 68
7OAH7POTENTIALQ4Y5D

Response (Difficulty: 1/5)

Response

3yg2verumz499s

Trying this code as a passcode will give us Invalid Passcode. There should be a keyword substitution for verum: inveniri.

3yg2inveniriz499s

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Passcode Decoding Walkthrough #012

by Jack Truong (SQL) time to read: 1 min
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