Zukane CTF

I sometimes post writeups for crypto challenges I find interesting

Featured Writeups

My Signed Nonsense (HelseCTF 2025)
ECDSA Biased Nonces Hidden Number Problem
Curveware (HTB Business CTF 2025)
Elliptic Curve Hidden Number Problem Ransomware Reverse Engineering

Writeups

Hyperactive (EPT 2025)
Hyperellipic Curve
Encryptor (EPT 2025)
RC4 Distinguishing Attack Pwn
Probable Prime 2 (WackAttack CTF 2025)
Miller-Rabin PRNG Pwn
Secure Agency (WackAttack CTF 2025)
Elliptic Curve PRNG Hidden Number Problem
Origami (NNS CTF 2025)
NTRU Folding attack
Crypto Party (NNS CTF 2025)
ECDSA Biased Nonces Hidden Number Problem
mvm sum problem (DREAM 2025)
AGCD Subset sum problem
L-iptic Curve Gimmick (DREAM 2025)
Elliptic Curve LCG Truncated attack
dripfeed (DREAM 2025)
Coppersmith small roots RSA
Diamond Ticket (idekCTF 2025)
RSA Common Modulus attack Diophantine
SHA-CTR (CERT.PL 2025)
SHA2 Length extension Stream cipher
Phony (CryptoCTF 2025)
RSA Coppersmith small roots
Mancity (CryptoCTF 2025)
RSA Coppersmith small roots
Secret^2 (L3AK 2025)
Coppersmith small roots
Lowkey RSA (L3AK 2025)
RSA Coppersmith small roots
Curveware (HTB Business CTF 2025)
Elliptic Curve Hidden Number Problem Ransomware Reverse Engineering
Dried Up Crypto (ictf Round 56)
RSA Branch and prune
Decision (ictf Round 53)
Knapsack Subset sum problem LLL Decisional
Univariate (ictf Round 54)
RSA Fermats Little Theorem
Bivariate (ictf Round 54)
RSA Fermats Little Theorem
Noise (ictf Round 49)
RSA Coppersmith small roots
RSARSA (ictf Round 52)
RSA
Square Up (UMDCTF 2025)
RSA Legendre Symbol
Prime Sponsorship (UMDCTF 2025) (Coming soon)
NTRU
Cover Yourself in Oil (UMDCTF 2025) (Coming soon)
UOV
beslutningsvegring (Cyberlandslaget 2025)
Kyber MLWE Decisional
Copperbox (HTB Cyber Appocalypse 2025)
Coppersmith small roots PRNG LCG
My Signed Nonsense (HelseCTF 2025)
ECDSA Biased Nonces Hidden Number Problem
Learning with Elliptic Curves (HelseCTF 2025)
Elliptic Curve ECDLP LWE Lattice
Signert Betaling (HelseCTF 2025)
AES-GCM Reused Nonce
Comet19 (CLL Julekalender 2024)
ECDSA Reused Nonce
That one RSA challenge (TCP1P 2024)
Coppersmith small roots RSA
Backdoor (ironCTF 2024)
PRNG Elliptic Curve Nodal Curve ECDLP
I Lost my Bottoms (H7CTF 2024)
Coppersmith small roots RSA
Trendy Windy Trigonity (CSCTF 2024)
LLL
Connorsmith (CSCTF 2024)
Coppersmith small roots RSA
Alle gode ting er fire (Cyberlandslaget 2024)
Quaternion Algebra
QRSA (Cyberlandslaget 2024)
Quaternion Algebra RSA