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Solved Challenges

Mathematics Prime and Prejudice 200
CTF Archive OffTopic (ECSC 2024 (Italy)) 0
CTF Archive OR Proof (CryptoHack) 0
CTF Archive ECLCG (HITCON CTF) 0
CTF Archive Hyper512 (HITCON CTF) 0
CTF Archive Greatest Common Multiple (CODEGATE CTF) 0
CTF Archive Fischlin's Transformation (CryptoHack) 0
ZKPs Hamiltonicity 1 100
ZKPs Let's Prove It 120
ZKPs OR Proof 75
CTF Archive U-turn (Breizh CTF) 0
CTF Archive Verilicious (Cyber Apocalypse 2025) 0
ZKPs Too Honest 50
Hash Functions MD0 80
ZKPs Non-Interactive 35
ZKPs Honest Verifier Zero Knowledge 30
ZKPs Special Soundness 25
ZKPs Proofs of Knowledge 20
ZKPs Let's Prove It Again 175
ZKPs Mister Saplin's Preview 80
ZKPs Couples 100
ZKPs Pairing-Based Cryptography 50
ZKPs ZKP Introduction 5
CTF Archive Additional problems (CSC Belgium) 0
CTF Archive Do you have good eyes? (Breizh CTF) 0
CTF Archive Authentification 2 (Breizh CTF) 0
CTF Archive Authentification 1 (Breizh CTF) 0
CTF Archive diffecient (SekaiCTF) 0
CTF Archive ed25519 magic (ICC Athens) 0
CTF Archive Substitution Cipher III (DownUnderCTF) 0
CTF Archive 1337crypt v2 (DownUnderCTF) 0
CTF Archive 1n_jection (Zh3r0 CTF V2) 0
CTF Archive A Joke Cipher (HKCERT CTF) 0
CTF Archive Chaos (Zh3r0 CTF V2) 0
CTF Archive Cipher Mode Picker (HKCERT CTF) 0
CTF Archive Key Backup Service 1 (HKCERT CTF) 0
CTF Archive Key Backup Service 2 (HKCERT CTF) 0
CTF Archive Oofbleck (Firebird Internal CTF) 0
CTF Archive Real Mersenne (Zh3r0 CTF V2) 0
CTF Archive Sign In Please, Again (HKCERT CTF) 0
CTF Archive Sratslla SEA (HKCERT CTF) 0
CTF Archive Tenet: The Plagarism (HKCERT CTF) 0
CTF Archive Twist and Shout (Zh3r0 CTF V2) 0
CTF Archive Unevaluated (TETCTF) 0
CTF Archive Unimplemented (TETCTF) 0
CTF Archive import numpy as MT (Zh3r0 CTF V2) 0
CTF Archive Sign in Please (HKCERT CTF) 0
CTF Archive Calm Down (HKCERT CTF) 0
CTF Archive 2020 (TETCTF) 0
Misc Trust Games 150
Symmetric Ciphers The Good, The Pad, The Ugly 100
Symmetric Ciphers Forbidden Fruit 150
Symmetric Ciphers Oh SNAP 120
Crypto on the Web RSA or HMAC? Part 2 100
Crypto on the Web Secure Protocols 5
Crypto on the Web TLS Handshake 15
Crypto on the Web Sharks on the Wire 10
Crypto on the Web Saying Hello 20
Crypto on the Web Authenticated Handshake 40
Crypto on the Web Decrypting TLS 1.3 35
Crypto on the Web Decrypting TLS 1.2 30
Crypto on the Web JSON in JSON 40
Crypto on the Web RSA or HMAC? 35
Crypto on the Web JWT Secrets 25
Crypto on the Web No Way JOSE 20
Misc Bit by Bit 100
Misc Armory 100
Misc Bruce Schneier's Password 100
Misc Gotta Go Fast 40
Misc Jeff's LFSR 150
Misc RSA vs RNG 150
Misc L-Win 120
Misc No Leaks 100
Elliptic Curves An Exceptional Twisted Mind 125
Elliptic Curves Micro Transmissions 120
Elliptic Curves Edwards Goes Degenerate 100
Elliptic Curves Double and Broken 50
Elliptic Curves Elliptic Nodes 150
Elliptic Curves A Twisted Mind 80
Elliptic Curves Exceptional Curves 100
Diffie-Hellman The Matrix Revolutions 125
Diffie-Hellman The Matrix Reloaded 100
Diffie-Hellman The Matrix 75
Diffie-Hellman Script Kiddie 70
Diffie-Hellman Static Client 2 120
Diffie-Hellman Additive 70
Diffie-Hellman Static Client 100
Elliptic Curves Moving Problems 150
Elliptic Curves ProSign 3 100
Elliptic Curves Curveball 100
Elliptic Curves Smooth Criminal 60
Elliptic Curves Montgomery's Ladder 40
Diffie-Hellman Export-grade 100
Diffie-Hellman Parameter Injection 60
Diffie-Hellman Deriving Symmetric Keys 40
Diffie-Hellman Computing Shared Secrets 30
Diffie-Hellman Computing Public Values 25
Diffie-Hellman Generators of Groups 20
Diffie-Hellman Working with Fields 10
CTF Archive 1337crypt (DownUnderCTF) 0
CTF Archive Tough decisions (ECSC 2023 (Norway)) 0
Lattices Nativity 60
RSA Modulus Inutilis 50
RSA Endless Emails 150
RSA Manyprime 40
Lattices Noise Free 40
Lattices LWE Low Bits Message 20
Lattices LWE High Bits Message 15
Lattices From Private to Public Key LWE 25
Lattices Size and Basis 15
Lattices Vectors 10
Symmetric Ciphers ECB Oracle 60
RSA RSA Decryption 20
RSA Modular Exponentiation 10
RSA Public Keys 15
RSA Euler's Totient 20
RSA Private Keys 20
RSA RSA Signatures 25
RSA Monoprime 30
RSA Inferius Prime 30
RSA Factoring 15
RSA Square Eyes 35
RSA Salty 20
RSA Everything is Big 70
RSA Crossed Wires 100
RSA Everything is Still Big 100
RSA Fast Primes 75
RSA Infinite Descent 50
RSA RSA Backdoor Viability 175
RSA Let's Decrypt Again 175
RSA Null or Never 100
RSA Marin's Secrets 50
RSA Ron was Wrong, Whit is Right 90
RSA Bespoke Padding 100
RSA Signing Server 60
RSA Let's Decrypt 80
RSA Blinding Light 120
RSA Vote for Pedro 150
Mathematics Cofactor Cofantasy 150
Mathematics Real Eisenstein 150
Mathematics Unencryptable 125
Mathematics Roll your Own 125
Mathematics Ellipse Curve Cryptography 125
Mathematics No Way Back Home 100
Mathematics Broken RSA 100
Mathematics Modular Binomials 80
Mathematics Adrien's Signs 80
Mathematics Successive Powers 60
Mathematics Chinese Remainder Theorem 40
Mathematics Modular Square Root 35
Mathematics Legendre Symbol 35
Mathematics Quadratic Residues 25
Isogenies Prime Power Isogenies 50
Isogenies Special Isogenies 30
Isogenies Three Isogenies 35
Isogenies Two Isogenies 30
Isogenies Montgomery Curves 30
Isogenies Image Point Arithmetic 30
Isogenies Where's the Supersingular Curve 25
Isogenies The j-invariant 20
Isogenies Introduction to Isogenies 10
Hash Functions Hash Stuffing 50
Hash Functions Collider 50
Hash Functions Jack's Birthday Confusion 30
Hash Functions Jack's Birthday Hash 20
Symmetric Ciphers Bringing It All Together 50
Elliptic Curves Efficient Exchange 50
Elliptic Curves Curves and Logs 40
Elliptic Curves Scalar Multiplication 35
Elliptic Curves Point Addition 30
Elliptic Curves Point Negation 10
Elliptic Curves Background Reading 5
Crypto on the Web JWT Sessions 10
Crypto on the Web Token Appreciation 5
Symmetric Ciphers Beatboxer 150
Symmetric Ciphers Paper Plane 120
Symmetric Ciphers Pad Thai 80
Symmetric Ciphers Dancing Queen 120
Symmetric Ciphers Stream of Consciousness 80
Symmetric Ciphers Logon Zero 80
Symmetric Ciphers CTRIME 70
Symmetric Ciphers Bean Counter 60
Symmetric Ciphers Symmetry 50
Symmetric Ciphers Triple DES 60
Symmetric Ciphers Lazy CBC 60
Symmetric Ciphers Flipping Cookie 60
Symmetric Ciphers ECB CBC WTF 55
Symmetric Ciphers Passwords as Keys 50
Symmetric Ciphers Modes of Operation Starter 15
Symmetric Ciphers Diffusion through Permutation 30
Symmetric Ciphers Confusion through Substitution 25
Symmetric Ciphers Round Keys 20
Symmetric Ciphers Structure of AES 15
Symmetric Ciphers Resisting Bruteforce 10
Symmetric Ciphers Keyed Permutations 5
General Transparency 50
General SSH Keys 35
General CERTainly not 30
General Privacy-Enhanced Mail? 25
General Modular Inverting 25
General Modular Arithmetic 1 20
General Extended GCD 20
General Lemur XOR 40
General Encoding Challenge 40
Introduction Network Attacks 5
General Modular Arithmetic 2 20
General Greatest Common Divisor 15
General You either know, XOR you don't 30
General Favourite byte 20
General XOR Properties 15
General XOR Starter 10
General Bytes and Big Integers 10
General Base64 10
General Hex 5
General ASCII 5
Introduction Great Snakes 3
Introduction Finding Flags 2

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