There were 2 codes in the Citadel post on the Investigate Blog.

[1] 012345565667654432110-1-2-100-1-2-1-101233210012332234554567887676654567789×99 [2] dkzrxthtesmlytsirubm

Code #1

Observations

The numbers seem to be somewhat in increasing or decreasing order, but there are weird symbols around some of the numbers (- and ×).

[hint]

The dashes are next to 1, and 2, which means negative numbers, and it makes sense since it would be decreasing from 0.

The × next to the 9 probably means a 10 (Roman Numeral).

[/hint]

Spoiler

There are 3 cases to work with: increasing value, equal value, decreasing value.

0 1 2 3 4 5 5 6 5 6 6 7 6 5 4 4 3 2 1 1 0 -1 -2 -1 0 0 -1 -2 -1 -1 0 1 2 3 3 2 1 0 0 1 2 3 3 2 2 3 4 5 5 4 5 6 7 8 8 7 6 7 6 6 5 4 5 6 7 7 8 9 × 9 9 _+ + + + + = + - + = + - - - = - - - = - - - + + = - - + = + + + + = - - - = + + + = - = + + + = - + + + + = - - + - = - - + + + = + + + - =

The equal signs are spaced at most 5 apart from each other, which would implicate Morse encoding.

+++++ +-+ +--- --- ---++ --+ ++++ --- +++ - +++ -++++ --+- --+++ +++-

Converting + to a dit, and – to a dah:

..... .-. .--- --- ---.. --. .... --- ... - ... -.... --.- --... ...-

5RJO8GHOSTS6Q7V

Code #2

Observations

The length of the code is 20 characters, which is below average for a string with 4 numbers. Transposition doesn’t give us anything useful.

Spoiler

Code #1

Observations

Code #2

Observations

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