Zukane CTF
I sometimes post writeups for crypto challenges I find interesting
Featured Writeups
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My Signed Nonsense (HelseCTF 2025)
ECDSA
Biased Nonces
Hidden Number Problem
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Curveware (HTB Business CTF 2025)
Elliptic Curve
Hidden Number Problem
Ransomware
Reverse Engineering
Writeups
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
Low density subset problem
LLL
Decisional
Univariate (ictf Round 54)
RSA
Fermat's Little Theorem
Bivariate (ictf Round 54)
RSA
Fermat's 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
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