2017from public repositories
HackyEaster 2017
18 challenges with 18 published solutions between them. CTFtime has no listing for this event at all, so nothing built on CTFtime can show what it was made of. These writeups were found in public repositories instead. Each link is pinned to the commit it was read from.
Where these writeups liveUncategorised16
The upstream scoreboard did not say, so neither do we.
00 Teaser
1 official solution01 Challenge 01 Puzzle This
1 official solution02 Challenge 02 Lots Of Dots
1 official solution03 Challenge 03 Favourite Letters
1 official solution04 Challenge 04 Cool Car
1 official solution05 Challenge 05 Key Strokes
1 official solution08 Challenge 08 Snd Mny
1 official solution09 Challenge 09 Microscope
1 official solution10 Challenge 10 An Egg Or Not
1 official solution11 Challenge 11 Tweaked Tweet
1 official solution12 Challenge 12 Once Upon A File
1 official solution14 Challenge 15 P Cap
1 official solution15 Challenge 16 Pathfinder
1 official solution16 Challenge 18 Nitwits Doormat Key
1 official solution17 Challenge 20 Spaghetti Hash
1 official solution18 Challenge 22 Game Set And Hash
1 official solution
Cryptography1
Recover a plaintext or a key from something that was supposed to protect it. In practice: identify the scheme, find the parameter the author got wrong, exploit it.
Solve it with:Cipher identifier and automatic decoderVigenere cipher solver with automatic key recoveryRSA decryption and attack runnerWiener’s attack on small RSA private exponentsIn-browser hash cracker with rule transformsLearn: Classical ciphers and frequency analysisLearn: RSA and the parameters that break it
07 Challenge 07 Crypto For Rookies
1 official solution
Misc1
Everything that fits no other box: esolangs, puzzles, scripting exercises, and the jail escapes that have not yet earned their own category.
Solve it with:Brainfuck and esolang decoderCipher identifier and automatic decoderRegex tester with match offsets and capture groupsLearn: Recognising encodings
Public Suffix List
1 official solution