2023weight 59.60ASIS

Crypto CTF 2023

8 challenges with 8 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

Cryptography8

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

ASIv1
80 pts1 writeup
- cryptography
Same technique in picoCTF: StegoRSA, Timestamped Secrets, AES-ABC
Barak
150 pts1 writeup
- cryptography
Same technique in picoCTF: StegoRSA, Timestamped Secrets, AES-ABC
Blue Office
36 pts1 writeup
- cryptography
Same technique in picoCTF: StegoRSA, Timestamped Secrets, AES-ABC
Did it!
33 pts1 writeup
- cryptography
Same technique in picoCTF: StegoRSA, Timestamped Secrets, AES-ABC
Insights
59 pts1 writeup
- cryptography
Same technique in picoCTF: StegoRSA, Timestamped Secrets, AES-ABC
Roldy
85 pts1 writeup
- cryptography
Same technique in picoCTF: StegoRSA, Timestamped Secrets, AES-ABC
TPSD
82 pts1 writeup
- cryptography
Same technique in picoCTF: StegoRSA, Timestamped Secrets, AES-ABC
Trex
100 pts1 writeup
- cryptography
Same technique in picoCTF: StegoRSA, Timestamped Secrets, AES-ABC

Cryptography8

ASIv1

Barak

Blue Office

Did it!

Insights

Roldy

TPSD

Trex

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