AlexCTF
20 challenges with 187 published community solutions between them. Solution links go to CTFtime’s task page, which aggregates every writeup for a challenge - individual blog posts rot, the aggregator does not.
Full task list on CTFtimeMisc6
Everything that fits no other box: esolangs, puzzles, scripting exercises, and the jail escapes that have not yet earned their own category.
- scripting
Same technique in picoCTF: Permissions, Specialer, Codebook
- trivia
Same technique in picoCTF: Permissions, Specialer, Codebook
- trivia
Same technique in picoCTF: Permissions, Specialer, Codebook
- trivia
Same technique in picoCTF: Permissions, Specialer, Codebook
- trivia
Same technique in picoCTF: Permissions, Specialer, Codebook
- bruteforce
Same technique in picoCTF: Permissions, Specialer, Codebook
Cryptography5
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.
- cryptography-rsa
- crypto
Same technique in picoCTF: StegoRSA, john_pollard, rsa_oracle
- crypto
Same technique in picoCTF: StegoRSA, Timestamped Secrets, AES-ABC
- cryptography
Same technique in picoCTF: StegoRSA, john_pollard, rsa_oracle
- cryptography-rsa
Same technique in picoCTF: StegoRSA, john_pollard, rsa_oracle
- crypto
Same technique in picoCTF: StegoRSA, Timestamped Secrets, AES-ABC
Reverse engineering5
Work out what a compiled program does without its source, then work backwards from the check to the input that passes it.
- engineering
- reverse
Same technique in picoCTF: WinAntiDbg0x100, WinAntiDbg0x200, WinAntiDbg0x300
- engineering
- reverse
Same technique in picoCTF: WinAntiDbg0x100, WinAntiDbg0x200, WinAntiDbg0x300
- reverse
- engineering
Same technique in picoCTF: WinAntiDbg0x100, WinAntiDbg0x200, WinAntiDbg0x300
- reversing
Same technique in picoCTF: WinAntiDbg0x100, WinAntiDbg0x200, WinAntiDbg0x300
- reversing
Same technique in picoCTF: WinAntiDbg0x100, WinAntiDbg0x200, WinAntiDbg0x300
Forensics3
Recover something from a file, a capture, or a disk image - often from a part of it the format says is unused.
- usb
- forensics
Same technique in picoCTF: FindAndOpen, c0rrupt, extensions
- forensics
Same technique in picoCTF: FindAndOpen, c0rrupt, extensions
- forensics
Same technique in picoCTF: FindAndOpen, c0rrupt, extensions
Steganography1
Find the payload hidden inside a carrier that looks ordinary. Bit planes, appended data, metadata, and audio spectrograms.
- steganography
Same technique in picoCTF: FindAndOpen, StegoRSA, Glory of the Garden