2025weight 67.32LIT CTF
Lexington Informatics Tournament CTF 2025
4 challenges with 5 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 CTFtimeWeb3
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: Sessions, tokens and access control
- flask
- web
Same technique in picoCTF: Live Art, secure-email-service, No FA
- flask
- ssti
- web
- flask
- sql-injection
- web
- command_injection
- stored-xss
Same technique in picoCTF: Live Art, secure-email-service, Irish-Name-Repo 3
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
- rsa
- crypto
- xor
Same technique in picoCTF: It's Not My Fault 2, StegoRSA, john_pollard