SEC-T - 0x0D*******

September 16-18, 2020 – Stockholm, Sweden

Badge Puzzles

SEC-T Badge Puzzle is a new tradition of pen-brain-and-paper puzzles designed to be medium hard yet annoyingly easy to over analyse. The first person to solve a badge challenge will get two free entries to SEC-T of the year(s) of their choice. Currently there are different methods for submitting your answer, either by using the same webpage your ticket was downloaded from or by emailing [email protected]

If you believe you find a bug or are in a desperate need of a hint send us an email to [email protected]. To the extent that we give answers to any elements of the puzzle these answers will also be published here for everyone to see.


2018 (Unsolved)

The 2018 badge challenge was delivered on an NFC tag. The challenge had a minor bug that could easily have been figured out. But  because of that we have reprinted a fixed version below (base64 to preserve the data).

X25Db21tdW5pdHlFY29sb2d5QXRfaGlzcG9pbl9pZnlvX2hhdmVyZWFkdGhyb3VnaG91X3Zpc2lf
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ZWNfeW91YXJlcGFydG9mdGhlY29tbV9faXR5Zm9yd2hpY2h0aGlzZWNvc19zdGVtaXNpbXBvcnRh
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c21vcmV3b3JfaHdoX2xlZm9yZXZlcnlvbmVpX3ZvbHZlZG9yanVzdGhhdmVhbmlfZWFvZmhvd3dl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The badge puzzle was also printed as a poster for SEC-T 2019


2019 (Solved)

The 2019 badge challenge was printed on one side of the plastic badge and so far no bugs have been found.

History:

A member of audience came up to me and said they were there to “face me for two free tickets”. Clearly thinking this was the trick to winning.

I told them it wasn’t me saying this but that they instead should do what the card told them, to the card, and not to me.

Human: Who is Andy T?

SEC-T: There is no Andy T… it should be read as “and YT”

The 2019 badge was solved by Carl Sundvall on October 14:th 2019


2020 (To be released)