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Solved Challenges

Misc Bruce Schneier's Password: Part 2 250
Symmetric Ciphers Oracular Spectacular 150
Hash Functions Invariant 250
Hash Functions WOTS Up 2 90
Hash Functions WOTS Up 75
Isogenies A True Genus 175
Isogenies Meet me in the Claw 120
Isogenies Dual Masters 90
Isogenies Abelian SIDH 90
Isogenies Better than Linear 85
Elliptic Curves Double and Broken 50
Elliptic Curves ProSign 3 100
Elliptic Curves Curveball 100
Elliptic Curves Montgomery's Ladder 40
Hash Functions Twin Keys 100
Elliptic Curves Edwards Goes Degenerate 100
Elliptic Curves No Random, No Bias 120
Hash Functions MDFlag 125
Elliptic Curves Checkpoint 150
RSA Let's Decrypt Again 175
Isogenies André Encoding 80
Elliptic Curves An Evil Twisted Mind 175
Isogenies What's My Kernel 70
Elliptic Curves Digestive 60
Elliptic Curves Real Curve Crypto 200
RSA Vote for Pedro 150
Isogenies CSIDH Key Exchange 90
RSA Let's Decrypt 80
RSA Blinding Light 120
RSA Bespoke Padding 100
Elliptic Curves An Exceptional Twisted Mind 125
RSA Signing Server 60
Isogenies Twisted CSIDH Isogenies 70
Elliptic Curves A Twisted Mind 80
RSA RSA Backdoor Viability 175
ZKPs Let's Prove It Again 175
RSA Null or Never 100
Isogenies Secret Exponents 60
RSA Fast Primes 75
ZKPs Mister Saplins The Prover 125
Lattices Too Many Errors 100
Isogenies Prime Power Isogenies 50
ZKPs Let's Prove It 120
ZKPs Couples 100
Misc Bruce Schneier's Password 100
Lattices Noise Cheap 90
Crypto on the Web Megalomaniac 3 120
Crypto on the Web Megalomaniac 2 120
Crypto on the Web Megalomaniac 1 100
ZKPs Mister Saplin's Preview 80
ZKPs Pairing-Based Cryptography 50
Isogenies Special Isogenies 30
Lattices Missing Modulus 80
Elliptic Curves Moving Problems 150
ZKPs Ticket Maestro 200
Misc Toshi's Treasure 150
Mathematics Prime and Prejudice 200
Isogenies Breaking SIDH 250
Lattices Nativity 60
ZKPs Fischlin Transform 180
Isogenies SIDH Key Exchange 80
Lattices Bounded Noise 50
Diffie-Hellman The Matrix Revolutions 125
Elliptic Curves Elliptic Nodes 150
RSA Everything is Still Big 100
Mathematics Real Eisenstein 150
Isogenies Composite Isogenies 60
Lattices Noise Free 40
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 Saying Hello 20
Crypto on the Web TLS Handshake 15
Misc LFSR Destroyer 250
Mathematics Cofactor Cofantasy 150
Lattices From Private to Public Key LWE 25
Diffie-Hellman The Matrix Reloaded 100
Isogenies Three Isogenies 35
Lattices LWE Low Bits Message 20
Diffie-Hellman The Matrix 75
Hash Functions Mixed Up 120
Mathematics Unencryptable 125
Lattices LWE High Bits Message 15
Hash Functions MD0 80
Hash Functions No Difference 175
Hash Functions Merkle Trees 25
Misc Armory 100
Misc Bit by Bit 100
RSA Ron was Wrong, Whit is Right 90
Mathematics Roll your Own 125
RSA Infinite Descent 50
Lattices LWE Intro 10
RSA Marin's Secrets 50
RSA Endless Emails 150
RSA Crossed Wires 100
RSA Everything is Big 70
RSA Modulus Inutilis 50
RSA Salty 20
Symmetric Ciphers Beatboxer 150
Symmetric Ciphers Oh SNAP 120
Symmetric Ciphers The Good, The Pad, The Ugly 100
Symmetric Ciphers Logon Zero 80
Symmetric Ciphers Pad Thai 80
Symmetric Ciphers Forbidden Fruit 150
Symmetric Ciphers Paper Plane 120
Symmetric Ciphers Dancing Queen 120
Symmetric Ciphers Stream of Consciousness 80
Symmetric Ciphers CTRIME 70
Symmetric Ciphers Bean Counter 60
Symmetric Ciphers Symmetry 50
Symmetric Ciphers Triple DES 60
Symmetric Ciphers Lazy CBC 60
ZKPs Hamiltonicity 2 175
Crypto on the Web Sharks on the Wire 10
Isogenies Two Isogenies 30
Elliptic Curves Micro Transmissions 120
Lattices LWE Background 5
Mathematics Ellipse Curve Cryptography 125
Diffie-Hellman Script Kiddie 70
Symmetric Ciphers Flipping Cookie 60
RSA Manyprime 40
Diffie-Hellman Static Client 2 120
ZKPs Hamiltonicity 1 100
Elliptic Curves Exceptional Curves 100
Mathematics No Way Back Home 100
Crypto on the Web Secure Protocols 5
Misc Jeff's LFSR 150
Symmetric Ciphers ECB Oracle 60
Lattices Backpack Cryptography 120
ZKPs OR Proof 75
Isogenies DLOG on the Surface 40
RSA Square Eyes 35
Elliptic Curves Smooth Criminal 60
Crypto on the Web RSA or HMAC? Part 2 100
Mathematics Broken RSA 100
Diffie-Hellman Additive 70
Misc L-Win 120
RSA Monoprime 30
ZKPs Too Honest 50
Elliptic Curves Efficient Exchange 50
Symmetric Ciphers ECB CBC WTF 55
Isogenies Montgomery Curves 30
RSA Inferius Prime 30
Lattices Find the Lattice 100
Misc Trust Games 150
Crypto on the Web JSON in JSON 40
Diffie-Hellman Static Client 100
Mathematics Modular Binomials 80
Symmetric Ciphers Passwords as Keys 50
ZKPs Non-Interactive 35
Crypto on the Web RSA or HMAC? 35
Elliptic Curves Curves and Logs 40
Isogenies Image Point Arithmetic 30
Hash Functions PriMeD5 100
Lattices Gaussian Reduction 50
RSA Factoring 15
Misc RSA vs RNG 150
Diffie-Hellman Export-grade 100
Symmetric Ciphers Modes of Operation Starter 15
Isogenies Where's the Supersingular Curve 25
Elliptic Curves Scalar Multiplication 35
Lattices What's a Lattice? 40
ZKPs Honest Verifier Zero Knowledge 30
Misc Nothing Up My Sleeve 150
Symmetric Ciphers Bringing It All Together 50
Diffie-Hellman Parameter Injection 60
Elliptic Curves Point Addition 30
Mathematics Adrien's Signs 80
Crypto on the Web JWT Secrets 25
RSA RSA Signatures 25
ZKPs Special Soundness 25
Lattices Gram Schmidt 30
Mathematics Successive Powers 60
Crypto on the Web No Way JOSE 20
RSA RSA Decryption 20
Diffie-Hellman Deriving Symmetric Keys 40
Symmetric Ciphers Diffusion through Permutation 30
Hash Functions Hash Stuffing 50
Elliptic Curves Point Negation 10
ZKPs Proofs of Knowledge 20
Isogenies The j-invariant 20
Misc Lo-Hi Card Game 120
Lattices Size and Basis 15
Crypto on the Web JWT Sessions 10
Symmetric Ciphers Confusion through Substitution 25
Mathematics Chinese Remainder Theorem 40
RSA Private Keys 20
Diffie-Hellman Computing Shared Secrets 30
Hash Functions Collider 50
ZKPs ZKP Introduction 5
Elliptic Curves Background Reading 5
Lattices Vectors 10
Crypto on the Web Token Appreciation 5
Isogenies Introduction to Isogenies 10
Mathematics Modular Square Root 35
RSA Euler's Totient 20
Symmetric Ciphers Round Keys 20
Misc No Leaks 100
Diffie-Hellman Computing Public Values 25
Hash Functions Jack's Birthday Confusion 30
RSA Public Keys 15
RSA Modular Exponentiation 10
Mathematics Legendre Symbol 35
Mathematics Quadratic Residues 25
Hash Functions Jack's Birthday Hash 20
Diffie-Hellman Generators of Groups 20
Diffie-Hellman Working with Fields 10
Symmetric Ciphers Structure of AES 15
Symmetric Ciphers Resisting Bruteforce 10
Misc Gotta Go Fast 40
Symmetric Ciphers Keyed Permutations 5
General Modular Inverting 25
General Privacy-Enhanced Mail? 25
General Modular Arithmetic 2 20
General CERTainly not 30
General Modular Arithmetic 1 20
General SSH Keys 35
General Extended GCD 20
General Transparency 50
General Greatest Common Divisor 15
General Lemur XOR 40
General You either know, XOR you don't 30
General Favourite byte 20
General XOR Properties 15
General XOR Starter 10
General Encoding Challenge 40
General Base64 10
General Bytes and Big Integers 10
General Hex 5
General ASCII 5
Introduction Network Attacks 5
Introduction Great Snakes 3
Introduction Finding Flags 2
CTF Archive Hyper512 (HITCON CTF) 0
CTF Archive What a Curve! (Breizh CTF) 0
CTF Archive Oofbleck (Firebird Internal CTF) 0
CTF Archive Maybe Someday (Maybe Someday CTF) 0
CTF Archive Maybe Someday (GoogleCTF) 0
CTF Archive Dark Arts (CODEGATE CTF) 0
CTF Archive RSATogether (ECSC 2024 (Italy)) 0
CTF Archive Quo vadis? (ECSC 2024 (Italy)) 0
CTF Archive ed25519 magic (ICC Athens) 0
CTF Archive diffecient (SekaiCTF) 0
CTF Archive pekobot (AIS3 Pre-Exam) 0
CTF Archive Unbalanced (ICC Athens) 0
CTF Archive 1337crypt v2 (DownUnderCTF) 0
CTF Archive Signature (TSJ CTF) 0
CTF Archive 1n_jection (Zh3r0 CTF V2) 0
CTF Archive RSA Secret Sharing (WACON) 0
CTF Archive A Joke Cipher (HKCERT CTF) 0
CTF Archive Chaos (Zh3r0 CTF V2) 0
CTF Archive RSA Permutation (WACON) 0
CTF Archive Cipher Mode Picker (HKCERT CTF) 0
CTF Archive Probability (SEETF) 0
CTF Archive Key Backup Service 1 (HKCERT CTF) 0
CTF Archive Key Backup Service 2 (HKCERT CTF) 0
CTF Archive Real Mersenne (Zh3r0 CTF V2) 0
CTF Archive Lack of Entropy (Firebird Internal CTF) 0
CTF Archive Sign In Please, Again (HKCERT CTF) 0
CTF Archive Key recovery (DCTF) 0
CTF Archive SpongeBob SquarePants / Battle for Bikini Bottom - Rehydrated (HTB Cyber Apocalypse) 0
CTF Archive Functional (ICC Athens) 0
CTF Archive Sratslla SEA (HKCERT CTF) 0
CTF Archive Substitution Cipher III (DownUnderCTF) 0
CTF Archive FaILProof Revenge (SekaiCTF) 0
CTF Archive Tenet: The Plagarism (HKCERT CTF) 0
CTF Archive FaILProof (SekaiCTF) 0
CTF Archive Twist and Shout (Zh3r0 CTF V2) 0
CTF Archive C0ll1d3r (Firebird Internal CTF) 0
CTF Archive Unevaluated (TETCTF) 0
CTF Archive Authenticator (Firebird Internal CTF) 0
CTF Archive Unimplemented (TETCTF) 0
CTF Archive import numpy as MT (Zh3r0 CTF V2) 0
CTF Archive unrandom DSA (HackTM CTF) 0
CTF Archive 1337crypt (DownUnderCTF) 0
CTF Archive 2020 (TETCTF) 0
CTF Archive Calm Down (HKCERT CTF) 0
CTF Archive kaitenzushi (HackTM CTF) 0
CTF Archive Sign in Please (HKCERT CTF) 0
CTF Archive d-phi-enc (HackTM CTF) 0
CTF Archive broken oracle (HackTM CTF) 0
CTF Archive Twist and shout (ECSC 2023 (Norway)) 0
CTF Archive Tough decisions (ECSC 2023 (Norway)) 0
CTF Archive Sus (ImaginaryCTF) 0
CTF Archive Share (HITCON CTF) 0
CTF Archive RRSSAA (ECSC 2023 (Norway)) 0
CTF Archive Put a ring on it (ECSC 2023 (Norway)) 0
CTF Archive Leet Universe (ImaginaryCTF (Daily)) 0
CTF Archive Irish flan (ECSC 2023 (Norway)) 0
CTF Archive Hide and seek (ECSC 2023 (Norway)) 0
CTF Archive GLP420 (HackTM CTF) 0
CTF Archive Blind (ECSC 2023 (Norway)) 0
CTF Archive Ticket Maestro (CryptoHack) 0
CTF Archive Smithing contest (ECSC 2024 (Italy)) 0
CTF Archive One Round Crypto (ECSC 2024 (Italy)) 0
CTF Archive OffTopic (ECSC 2024 (Italy)) 0
CTF Archive OR Proof (CryptoHack) 0
CTF Archive Hamiltonicity 2 (CryptoHack) 0
CTF Archive Hamiltonicity (CryptoHack) 0
CTF Archive Greatest Common Multiple (CODEGATE CTF) 0
CTF Archive Fischlin's Transformation (CryptoHack) 0
CTF Archive ECLCG (HITCON CTF) 0
CTF Archive Additional problems (CSC Belgium) 0
CTF Archive Verilicious (Cyber Apocalypse 2025) 0
CTF Archive U-turn (Breizh CTF) 0
CTF Archive Authentification 2 (Breizh CTF) 0
CTF Archive Do you have good eyes? (Breizh CTF) 0
CTF Archive Authentification 1 (Breizh CTF) 0

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