2020from public repositories
HSCTF 2020
13 challenges with 15 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 liveUncategorised8
The upstream scoreboard did not say, so neither do we.
Boredom
2 official solutionsEmojis
2 official solutionsApple Pie
1 official solutionCs Principles
1 official solutionMorbid
1 official solutionRand1
1 official solutionRand2
1 official solutionTraffic Lights W
1 official solution
Reverse engineering4
Work out what a compiled program does without its source, then work backwards from the check to the input that passes it.
Solve it with:Strings extractor for binaries and blobsWebAssembly disassemblerJava .class disassemblerPython .pyc bytecode disassemblerLearn: Binary exploitation
Computer Science Principles
1 official solutionEnglish Language
1 official solutionIce Cream Bytes
1 official solutionRecursion Reverse
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
My First Calculator
1 official solution