Hsctf 2017
16 challenges with 16 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 liveCryptography4
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.
Alice And Bob 200
1 official solutionHidden Polynomials 100
1 official solutionKeith And Dawg 2 200
1 official solutionQuartenary 100
1 official solution
Forensics4
Recover something from a file, a capture, or a disk image - often from a part of it the format says is unused.
Basic Bucketfill 100
1 official solutionEasy Stegosaurus 200
1 official solutionKeith And Dawg 1 100
1 official solutionSurvey 50
1 official solution
Binary exploitation4
Turn a memory-safety bug in a native binary into control of execution. Usually a stack overflow, a format string, or a heap primitive.
El Clasico 100
1 official solutionKeith Shell 100
1 official solutionPython Exploitation 1 100
1 official solutionPython Exploitation 2 200
1 official solution
Misc2
Everything that fits no other box: esolangs, puzzles, scripting exercises, and the jail escapes that have not yet earned their own category.
Coin Flip 100
1 official solutionPing Pong 200
1 official solution
Uncategorised2
The upstream scoreboard did not say, so neither do we.
Ke1th 200
1 official solutionKeithor 100
1 official solution