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Solved Challenges

Elliptic Curves Montgomery's Ladder 40
Symmetric Ciphers Confusion through Substitution 25
Symmetric Ciphers Round Keys 20
Symmetric Ciphers Structure of AES 15
Symmetric Ciphers Flipping Cookie 60
Symmetric Ciphers Passwords as Keys 50
Symmetric Ciphers Modes of Operation Starter 15
Elliptic Curves Background Reading 5
Symmetric Ciphers Diffusion through Permutation 30
Misc No Leaks 100
Misc Gotta Go Fast 40
Diffie-Hellman Parameter Injection 60
Crypto on the Web JSON in JSON 40
Symmetric Ciphers Bean Counter 60
Symmetric Ciphers Symmetry 50
Symmetric Ciphers ECB CBC WTF 55
Symmetric Ciphers Resisting Bruteforce 10
Crypto on the Web JWT Secrets 25
Crypto on the Web No Way JOSE 20
Diffie-Hellman The Matrix 75
ZKPs Couples 100
ZKPs Mister Saplin's Preview 80
Isogenies André Encoding 80
Isogenies Special Isogenies 30
Isogenies Prime Power Isogenies 50
Elliptic Curves Micro Transmissions 120
Elliptic Curves Efficient Exchange 50
Elliptic Curves Exceptional Curves 100
Hash Functions PriMeD5 100
Hash Functions Hash Stuffing 50
Hash Functions Collider 50
Isogenies What's My Kernel 70
Diffie-Hellman Computing Shared Secrets 30
Mathematics Cofactor Cofantasy 150
Mathematics Roll your Own 125
General Transparency 50
General Encoding Challenge 40
Elliptic Curves Smooth Criminal 60
Isogenies Composite Isogenies 60
Isogenies Secret Exponents 60
Isogenies Twisted CSIDH Isogenies 70
Hash Functions Merkle Trees 25
Crypto on the Web Secure Protocols 5
Elliptic Curves Elliptic Nodes 150
Elliptic Curves No Random, No Bias 120
Elliptic Curves Curves and Logs 40
Elliptic Curves Scalar Multiplication 35
Elliptic Curves Point Addition 30
Elliptic Curves Point Negation 10
Lattices Backpack Cryptography 120
Diffie-Hellman Additive 70
Diffie-Hellman Computing Public Values 25
Mathematics Legendre Symbol 35
Mathematics Modular Square Root 35
ZKPs Pairing-Based Cryptography 50
RSA Let's Decrypt Again 175
RSA Square Eyes 35
RSA Monoprime 30
RSA Marin's Secrets 50
RSA Infinite Descent 50
RSA Salty 20
RSA Modulus Inutilis 50
RSA Everything is Big 70
RSA Crossed Wires 100
RSA Everything is Still Big 100
Mathematics Adrien's Signs 80
Mathematics Modular Binomials 80
Mathematics No Way Back Home 100
Mathematics Broken RSA 100
Mathematics Unencryptable 125
Mathematics Ellipse Curve Cryptography 125
Mathematics Real Eisenstein 150
Isogenies Three Isogenies 35
Misc Lo-Hi Card Game 120
Isogenies Two Isogenies 30
Crypto on the Web JWT Sessions 10
Lattices Find the Lattice 100
Lattices LWE Intro 10
Lattices What's a Lattice? 40
Isogenies Montgomery Curves 30
Isogenies Image Point Arithmetic 30
Diffie-Hellman Working with Fields 10
Diffie-Hellman Generators of Groups 20
Symmetric Ciphers Beatboxer 150
Symmetric Ciphers Dancing Queen 120
Hash Functions MD0 80
Symmetric Ciphers Keyed Permutations 5
Lattices From Private to Public Key LWE 25
Lattices LWE Background 5
Lattices Gaussian Reduction 50
Lattices Gram Schmidt 30
Lattices Size and Basis 15
Lattices Vectors 10
Mathematics Successive Powers 60
Mathematics Chinese Remainder Theorem 40
ZKPs ZKP Introduction 5
Elliptic Curves ProSign 3 100
Elliptic Curves Curveball 100
Elliptic Curves Edwards Goes Degenerate 100
Isogenies Introduction to Isogenies 10
Isogenies Meet me in the Claw 120
RSA Inferius Prime 30
General SSH Keys 35
General CERTainly not 30
General Privacy-Enhanced Mail? 25
General Lemur XOR 40
General Modular Inverting 25
General Modular Arithmetic 2 20
General Modular Arithmetic 1 20
General Extended GCD 20
General Greatest Common Divisor 15
RSA Factoring 15
RSA Euler's Totient 20
RSA Null or Never 100
General You either know, XOR you don't 30
General Favourite byte 20
General XOR Properties 15
RSA RSA Backdoor Viability 175
RSA Endless Emails 150
Misc L-Win 120
Misc Bit by Bit 100
Misc Armory 100
Misc RSA vs RNG 150
Mathematics Quadratic Residues 25
RSA Private Keys 20
RSA RSA Decryption 20
RSA Public Keys 15
RSA Modular Exponentiation 10
Hash Functions WOTS Up 2 90
Hash Functions WOTS Up 75
Hash Functions No Difference 175
Lattices Too Many Errors 100
Hash Functions Mixed Up 120
Hash Functions Jack's Birthday Confusion 30
Hash Functions Jack's Birthday Hash 20
Crypto on the Web Token Appreciation 5
CTF Archive Key Backup Service 2 (HKCERT CTF) 0
CTF Archive Sign in Please (HKCERT CTF) 0
CTF Archive Sus (ImaginaryCTF) 0
CTF Archive Oofbleck (Firebird Internal CTF) 0
CTF Archive ed25519 magic (ICC Athens) 0
CTF Archive Hide and seek (ECSC 2023 (Norway)) 0
CTF Archive Calm Down (HKCERT CTF) 0
CTF Archive Sratslla SEA (HKCERT CTF) 0
CTF Archive Cipher Mode Picker (HKCERT CTF) 0
CTF Archive Fischlin's Transformation (CryptoHack) 0
CTF Archive OR Proof (CryptoHack) 0
CTF Archive Tough decisions (ECSC 2023 (Norway)) 0
CTF Archive Key Backup Service 1 (HKCERT CTF) 0
CTF Archive RRSSAA (ECSC 2023 (Norway)) 0
CTF Archive Unevaluated (TETCTF) 0
CTF Archive Tenet: The Plagarism (HKCERT CTF) 0
CTF Archive Unimplemented (TETCTF) 0
CTF Archive A Joke Cipher (HKCERT CTF) 0
CTF Archive Lack of Entropy (Firebird Internal CTF) 0
CTF Archive 1n_jection (Zh3r0 CTF V2) 0
Isogenies The j-invariant 20
Diffie-Hellman Script Kiddie 70
General XOR Starter 10
General Bytes and Big Integers 10
General Base64 10
General Hex 5
General ASCII 5
Introduction Network Attacks 5
Introduction Great Snakes 3
Introduction Finding Flags 2

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