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Solved Challenges

CTF Archive Share (HITCON CTF) 0
CTF Archive RSA Permutation (WACON) 0
CTF Archive Maybe Someday (GoogleCTF) 0
CTF Archive Verilicious (Cyber Apocalypse 2025) 0
CTF Archive RSA Secret Sharing (WACON) 0
CTF Archive Dark Arts (CODEGATE CTF) 0
CTF Archive ECLCG (HITCON CTF) 0
CTF Archive broken oracle (HackTM CTF) 0
CTF Archive C0ll1d3r (Firebird Internal CTF) 0
CTF Archive Signature (TSJ CTF) 0
CTF Archive What a Curve! (Breizh CTF) 0
CTF Archive Real Mersenne (Zh3r0 CTF V2) 0
CTF Archive Do you have good eyes? (Breizh CTF) 0
CTF Archive Sus (ImaginaryCTF) 0
CTF Archive Put a ring on it (ECSC 2023 (Norway)) 0
CTF Archive Irish flan (ECSC 2023 (Norway)) 0
CTF Archive import numpy as MT (Zh3r0 CTF V2) 0
CTF Archive FaILProof Revenge (SekaiCTF) 0
CTF Archive FaILProof (SekaiCTF) 0
CTF Archive Authentification 2 (Breizh CTF) 0
CTF Archive Authentification 1 (Breizh CTF) 0
CTF Archive Oofbleck (Firebird Internal CTF) 0
CTF Archive Chaos (Zh3r0 CTF V2) 0
CTF Archive Key Backup Service 2 (HKCERT CTF) 0
CTF Archive Key Backup Service 1 (HKCERT CTF) 0
CTF Archive Leet Universe (ImaginaryCTF (Daily)) 0
CTF Archive kaitenzushi (HackTM CTF) 0
CTF Archive pekobot (AIS3 Pre-Exam) 0
CTF Archive Unevaluated (TETCTF) 0
CTF Archive ed25519 magic (ICC Athens) 0
CTF Archive Additional problems (CSC Belgium) 0
CTF Archive Tenet: The Plagarism (HKCERT CTF) 0
CTF Archive U-turn (Breizh CTF) 0
CTF Archive 1n_jection (Zh3r0 CTF V2) 0
CTF Archive Blind (ECSC 2023 (Norway)) 0
CTF Archive Twist and shout (ECSC 2023 (Norway)) 0
CTF Archive Tough decisions (ECSC 2023 (Norway)) 0
CTF Archive Lack of Entropy (Firebird Internal CTF) 0
CTF Archive Cipher Mode Picker (HKCERT CTF) 0
CTF Archive Unimplemented (TETCTF) 0
CTF Archive A Joke Cipher (HKCERT CTF) 0
CTF Archive Hide and seek (ECSC 2023 (Norway)) 0
CTF Archive Calm Down (HKCERT CTF) 0
CTF Archive 2020 (TETCTF) 0
CTF Archive 1337crypt (DownUnderCTF) 0
CTF Archive 1337crypt v2 (DownUnderCTF) 0
CTF Archive Sign In Please, Again (HKCERT CTF) 0
CTF Archive Sign in Please (HKCERT CTF) 0
CTF Archive RRSSAA (ECSC 2023 (Norway)) 0
CTF Archive Ticket Maestro (CryptoHack) 0
CTF Archive d-phi-enc (HackTM CTF) 0
CTF Archive Hamiltonicity 2 (CryptoHack) 0
Misc Bruce Schneier's Password: Part 2 250
Hash Functions Invariant 250
Isogenies A True Genus 175
Misc LFSR Destroyer 250
Isogenies Breaking SIDH 250
Elliptic Curves Real Curve Crypto 200
ZKPs Ticket Maestro 200
ZKPs Fischlin Transform 180
Symmetric Ciphers Oracular Spectacular 150
ZKPs Let's Prove It Again 175
ZKPs Hamiltonicity 2 175
Elliptic Curves An Evil Twisted Mind 175
Elliptic Curves Checkpoint 150
Symmetric Ciphers Beatboxer 150
Misc Jeff's LFSR 150
Misc Trust Games 150
Misc Toshi's Treasure 150
Misc RSA vs RNG 150
Isogenies Meet me in the Claw 120
Misc Nothing Up My Sleeve 150
Elliptic Curves An Exceptional Twisted Mind 125
Hash Functions MDFlag 125
Crypto on the Web Megalomaniac 2 120
ZKPs Let's Prove It 120
Crypto on the Web Megalomaniac 3 120
ZKPs Mister Saplins The Prover 125
Misc L-Win 120
Crypto on the Web Megalomaniac 1 100
ZKPs Couples 100
Lattices Too Many Errors 100
Misc Bit by Bit 100
ZKPs Hamiltonicity 1 100
Misc Bruce Schneier's Password 100
Isogenies Dual Masters 90
Isogenies Abelian SIDH 90
Isogenies Better than Linear 85
Isogenies CSIDH Key Exchange 90
ZKPs Mister Saplin's Preview 80
Isogenies André Encoding 80
Isogenies SIDH Key Exchange 80
ZKPs OR Proof 75
Isogenies What's My Kernel 70
Isogenies Twisted CSIDH Isogenies 70
Isogenies Secret Exponents 60
Isogenies Composite Isogenies 60
CTF Archive Fischlin's Transformation (CryptoHack) 0
CTF Archive OR Proof (CryptoHack) 0
CTF Archive Hamiltonicity (CryptoHack) 0
Misc Armory 100
Misc Lo-Hi Card Game 120
Mathematics Cofactor Cofantasy 150
Misc No Leaks 100
ZKPs Pairing-Based Cryptography 50
Isogenies Prime Power Isogenies 50
ZKPs Too Honest 50
Isogenies DLOG on the Surface 40
Isogenies Three Isogenies 35
ZKPs Non-Interactive 35
Isogenies Special Isogenies 30
Isogenies Two Isogenies 30
Isogenies Montgomery Curves 30
Isogenies Image Point Arithmetic 30
ZKPs Honest Verifier Zero Knowledge 30
Isogenies Where's the Supersingular Curve 25
ZKPs Special Soundness 25
Isogenies The j-invariant 20
ZKPs Proofs of Knowledge 20
Isogenies Introduction to Isogenies 10
ZKPs ZKP Introduction 5
Misc Gotta Go Fast 40
Elliptic Curves Moving Problems 150
Hash Functions PriMeD5 100
Lattices Noise Cheap 90
Hash Functions WOTS Up 2 90
Elliptic Curves A Twisted Mind 80
Lattices Missing Modulus 80
Diffie-Hellman The Matrix Revolutions 125
Elliptic Curves Edwards Goes Degenerate 100
Symmetric Ciphers The Good, The Pad, The Ugly 100
Elliptic Curves No Random, No Bias 120
RSA Let's Decrypt Again 175
Symmetric Ciphers Oh SNAP 120
Diffie-Hellman The Matrix Reloaded 100
Symmetric Ciphers Forbidden Fruit 150
Hash Functions No Difference 175
Elliptic Curves Micro Transmissions 120
Hash Functions Mixed Up 120
Symmetric Ciphers Pad Thai 80
Elliptic Curves Elliptic Nodes 150
Mathematics Prime and Prejudice 200
Mathematics Real Eisenstein 150
Symmetric Ciphers Paper Plane 120
Crypto on the Web RSA or HMAC? Part 2 100
Mathematics Roll your Own 125
Mathematics Ellipse Curve Cryptography 125
Symmetric Ciphers Dancing Queen 120
RSA Vote for Pedro 150
Lattices Backpack Cryptography 120
Diffie-Hellman Static Client 2 120
Lattices LWE Intro 10
RSA Bespoke Padding 100
Mathematics Unencryptable 125
RSA RSA Backdoor Viability 175
Diffie-Hellman Static Client 100
General Lemur XOR 40
RSA Null or Never 100
RSA Blinding Light 120
Mathematics No Way Back Home 100
Hash Functions WOTS Up 75
Elliptic Curves ProSign 3 100
RSA Fast Primes 75
Elliptic Curves Exceptional Curves 100
Mathematics Broken RSA 100
Diffie-Hellman The Matrix 75
Lattices Nativity 60
Crypto on the Web Authenticated Handshake 40
Lattices Bounded Noise 50
Crypto on the Web Decrypting TLS 1.3 35
Crypto on the Web Decrypting TLS 1.2 30
Elliptic Curves Double and Broken 50
Elliptic Curves Digestive 60
Symmetric Ciphers Stream of Consciousness 80
RSA Let's Decrypt 80
Hash Functions MD0 80
Hash Functions Hash Stuffing 50
Mathematics Successive Powers 60
Lattices Noise Free 40
Lattices From Private to Public Key LWE 25
Hash Functions Merkle Trees 25
Lattices LWE Low Bits Message 20
Lattices LWE High Bits Message 15
Crypto on the Web TLS Handshake 15
Lattices LWE Background 5
Crypto on the Web Saying Hello 20
Crypto on the Web Secure Protocols 5
Crypto on the Web Sharks on the Wire 10
Elliptic Curves Montgomery's Ladder 40
Symmetric Ciphers Logon Zero 80
Diffie-Hellman Script Kiddie 70
Lattices Find the Lattice 100
RSA Signing Server 60
Symmetric Ciphers CTRIME 70
Diffie-Hellman Additive 70
Elliptic Curves Curveball 100
RSA Ron was Wrong, Whit is Right 90
Elliptic Curves Smooth Criminal 60
Crypto on the Web RSA or HMAC? 35
Crypto on the Web JSON in JSON 40
Symmetric Ciphers Triple DES 60
RSA Endless Emails 150
RSA Everything is Still Big 100
Diffie-Hellman Export-grade 100
Lattices Gaussian Reduction 50
Lattices Gram Schmidt 30
Lattices What's a Lattice? 40
Symmetric Ciphers Lazy CBC 60
General Transparency 50
Elliptic Curves Efficient Exchange 50
RSA Everything is Big 70
Mathematics Adrien's Signs 80
Mathematics Modular Binomials 80
General SSH Keys 35
Crypto on the Web JWT Secrets 25
Elliptic Curves Curves and Logs 40
Elliptic Curves Scalar Multiplication 35
Hash Functions Collider 50
Diffie-Hellman Parameter Injection 60
RSA Infinite Descent 50
Elliptic Curves Point Addition 30
Symmetric Ciphers ECB Oracle 60
Hash Functions Jack's Birthday Confusion 30
RSA Marin's Secrets 50
Hash Functions Jack's Birthday Hash 20
RSA Crossed Wires 100
Lattices Size and Basis 15
Symmetric Ciphers Symmetry 50
Lattices Vectors 10
Symmetric Ciphers Bean Counter 60
Crypto on the Web No Way JOSE 20
Symmetric Ciphers Flipping Cookie 60
Crypto on the Web JWT Sessions 10
Crypto on the Web Token Appreciation 5
Elliptic Curves Point Negation 10
Elliptic Curves Background Reading 5
Symmetric Ciphers ECB CBC WTF 55
RSA Inferius Prime 30
Diffie-Hellman Deriving Symmetric Keys 40
RSA Square Eyes 35
Diffie-Hellman Computing Shared Secrets 30
Diffie-Hellman Computing Public Values 25
Diffie-Hellman Generators of Groups 20
RSA Modulus Inutilis 50
Symmetric Ciphers Passwords as Keys 50
Symmetric Ciphers Bringing It All Together 50
General CERTainly not 30
RSA Manyprime 40
RSA Salty 20
RSA Monoprime 30
General Privacy-Enhanced Mail? 25
Symmetric Ciphers Modes of Operation Starter 15
Diffie-Hellman Working with Fields 10
RSA Factoring 15
Symmetric Ciphers Diffusion through Permutation 30
Symmetric Ciphers Confusion through Substitution 25
RSA RSA Signatures 25
Mathematics Modular Square Root 35
RSA RSA Decryption 20
RSA Private Keys 20
Symmetric Ciphers Round Keys 20
Mathematics Chinese Remainder Theorem 40
Symmetric Ciphers Structure of AES 15
Mathematics Legendre Symbol 35
General Encoding Challenge 40
RSA Euler's Totient 20
RSA Public Keys 15
RSA Modular Exponentiation 10
Symmetric Ciphers Resisting Bruteforce 10
Symmetric Ciphers Keyed Permutations 5
Mathematics Quadratic Residues 25
General Modular Inverting 25
General Modular Arithmetic 2 20
General Modular Arithmetic 1 20
General Extended GCD 20
Introduction Network Attacks 5
General Greatest Common Divisor 15
General You either know, XOR you don't 30
General Favourite byte 20
General Base64 10
General XOR Properties 15
General XOR Starter 10
General Bytes and Big Integers 10
General Hex 5
General ASCII 5
Introduction Great Snakes 3
Introduction Finding Flags 2

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