2025no writeups on CTFtime
TsukuCTF 2025
15 challenges with 23 published solutions between them. CTFtime lists this event but has no writeups filed against it, so it is absent from the index CTFtime feeds. These were found in public repositories instead. Each link is pinned to the commit it was read from.
The event on CTFtimeOSINT7
Answer a question about the real world from public sources. The work is pivoting between identifiers, not exploiting anything.
Buildings
2 official solutionsDestroyed
2 official solutionsPower
2 official solutionsSchnee
2 official solutionsCasca
1 official solutionCurve
1 official solutionRider
1 official solution
Uncategorised5
The upstream scoreboard did not say, so neither do we.
Easy Kernel
2 official solutionsExp01 Commented
2 official solutionsNew Era
2 official solutionsXcache
2 official solutionsExp01
1 official solution
Web2
Reach data or functionality the application meant to keep from you - through its inputs, its tokens, or its trust in the client.
Solve it with:JWT decoder and signature verifierJWT alg=none bypass generatorWeb attack payload catalogJWT secret brute forceLearn: Web attacks and session tokens
Flash
1 official solutionLen Len
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
Output
1 official solution