Writeups

307 results

Cryptography challenge from the 2025 qualifier archive.

PlaidCTF 2025/Tales from the Crypt·500pts

TLS renegotiation leaks partial RSA private key material — recover d via Coppersmith.

CryptoinsaneBlog#crypto #rsa #plaidctf-2025Apr 6, 2025

picoCTF 2025/Quantum Scrambler·300pts

Harder crypto challenge from the 2025 scoreboard.

picoCTF 2025/EVEN RSA CAN BE BROKEN???·200pts

RSA with an even public exponent — factor N and decrypt.

CryptomediumBlog#crypto #rsa #picoctf-2025Mar 17, 2025

picoCTF 2025/hashcrack·100pts

Chain MD5, SHA-1, and SHA-256 hashes to recover the password.

DiceCTF 2025 Quals/fairy-ring·300pts

Medium crypto — see official sources and CTFtime writeups.

DiceCTF 2025 Quals/vorpal-sword·122pts

Crypto challenge from DiceCTF 2025 Quals archive.