2023from the authors’ own sites
DuckCTF 2023
7 challenges with 7 published solutions between them. The writeups for this event were found on the authors’ own sites.
Where these writeups liveUncategorised6
The upstream scoreboard did not say, so neither do we.
Easy Overflow
1 official solutionAlso written up in: blog.adelaideb9.com
Homebrewed Block Cipher
1 official solutionAlso written up in: blog.adelaideb9.com
Magic Beans
1 official solutionAlso written up in: blog.adelaideb9.com
Not So Standard Substitution Cipher
1 official solutionAlso written up in: blog.adelaideb9.com
Return Address Override
1 official solutionAlso written up in: blog.adelaideb9.com
The Lost Book
1 official solutionAlso written up in: blog.adelaideb9.com
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
A Based Crypto
1 official solutionAlso written up in: blog.adelaideb9.com