We see a pattern of lowercase followed by uppercase.
In the given order it does not point to anything specific, the normal ROT, Atbash, etc do not give anything useful and Base64 doesn’t match (That normally starts with M, N or O).
When looking in a mirror, what do the pairs say?
The repeating lowercase and uppercase tells me that there is something going on with the pairs.
Let us reverse the string to see something better.
Splitting the pairs of upper and lowercases reveals more information that we can use.
Fr Sb Tm La Bi Po Pt Tb Fr Sn Ac Ir Rn Sb
Did you notice that all the pairs seem like Element Symbols from the Periodic Table?
What is also fitting is that Sn, Sb and La all have Atomic numbers within the Numbers range, looks like we are on the right track, so replace all symbols with their atomic numbers from the Periodic Table.
87 51 69 57 83 84 78 65 87 50 89 77 86 51
Convert from decimal to ASCII
Reverse the string for our final solve.
We see what seems to be a valid prefix and suffix, but the middle two sections seem out of place.
What does the most widely used web tool tell you?
Start off with the assumption that the prefix and suffix are valid for now, so focus on figuring out if the middle part can be demystified.
With puzzles like these, I like to throw the unknown into Google and see what it spits out.
For this code, that is exactly what was needed.
61dzc-60X20” give the top most hit for the YouTube video “Journey™ Launch Trailer”.
Journey is a valid keyword in our realm, so try that first before we spend the two minutes to watch the video.
That was it! Sometimes the solves are quick and simple like this one.
A mixture of lots of numbers and only 5 letters.
This points to converting what we have into something more useful first.
Due to the placement of the letters, I am thinking that ROT and Atbash won’t give something useful.
But the start looks like something that we had already considered for this batch of codes.
Look for meaningful pairs’ish
Taking a look at the code, we see that it starts with
13, which could be converted to
N when using alphabet indexes of A=1..Z=26 or A=0..Z=25 respectively.
We know that if a Base64 string starts with M, N or O, that it could lead to a valid passcode, so follow this rabbit hole down a little bit.
Split up the code into meaningful numbers that fit inside the range of an alphabet index (1-26 or 0-25), making sure that the original letters are alone.
13 20 p 22 18 z 13 19 21 4 21 09 19 l 12 y 20 j 09 08
Convert numbers to letters with an alphabet index of A=0..Z=25
N U p W S z N T V E V J T l M y U j J I
We keep all characters convertet from numbers as capital letters.
Use a simple Base64 to Text decoder for the final solution.
P.S. In the near future, we will release an article that will explain more on how to spot Base64 conversions and other uses for it.