2018weight 0.00Timisoara CTF

Timisoara CTF 2018 Finals

4 challenges with 4 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 CTFtime

Cryptography2

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 decoder Vigenere cipher solver with automatic key recovery RSA decryption and attack runner Wiener’s attack on small RSA private exponents In-browser hash cracker with rule transforms Learn: Classical ciphers and frequency analysis Learn: RSA and the parameters that break it

Recap
250 pts1 writeup
- interpolation
- crypto
Same technique in picoCTF: StegoRSA, Timestamped Secrets, AES-ABC
Recess
400 pts1 writeup
- crypto
- hensel
Same technique in picoCTF: StegoRSA, Timestamped Secrets, AES-ABC

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 verifier JWT alg=none bypass generator Web attack payload catalog JWT secret brute force Learn: Web attacks and session tokens

SQL Sanity Check
100 pts1 writeup
- web
- sqli
Same technique in picoCTF: Irish-Name-Repo 3, More SQLi, Secret Box
YAPS
150 pts1 writeup
- web
- regex
- php
- eval
Same technique in picoCTF: Client-side-again, dont-use-client-side, Irish-Name-Repo 3

Cryptography2

Recap

Recess

Web2

SQL Sanity Check

YAPS

Other 2018 events