Capture the flag with the Norwegian Police Security Service - Easter edition

Here's a write-up showing how to solve the challenges of the Norwegian Police Security Service's Easter CTF.

Published: Wed, April 15, 2020, 16:00

Background ๐Ÿ‘ฎ ๐Ÿ”—

The Norwegian Police Security Service (with the Norwegian abbreviation PST which I'll use for this write-up) is the police security agency of Norway. Following up on their big Christmas CTF advent calendar they now did a smaller CTF for Easter.

The theme ๐Ÿฐ ๐Ÿ”—

This time PST added an H in their name and created the imaginary Easter Bunny's Security Service (Pรฅskeharens sikkerhetstjeneste = PHST). PHST's role is supposedly to protect the Easter Bunny's egg basket and core values. Everything happened on from April 9th to April 13th 2020.

Challenges and solutions ๐Ÿ”—

Let's jump straight in. Click on a challenge to expand it.

Scores ๐Ÿ”—

By the end of the day of second Easter day 19 people had full score and a total of 24 had solved all the challenges. I was pretty happy being the fourth person to solve the last challenge and therefore placing me on fourth place in total.

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Some final thoughts ๐Ÿ”—

I really enjoyed these Easter puzzles. They were entertaining, varied and they didn't need that big of a time investment. Maybe the best part was that the challenges were opened daily at 12 p.m. instead of 12 a.m., so there was no need to lose any sleep or check the mobile in the middle of the night.

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