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Solved Challenges

Introduction Network Attacks 5
Diffie-Hellman Diffie-Hellman Starter 5 40
General Modular Inverting 25
General Modular Arithmetic 2 20
General Modular Arithmetic 1 20
Mathematics Adrien's Signs 80
Diffie-Hellman Parameter Injection 60
Hash Functions Mixed Up 120
Hash Functions MDFlag 125
Misc Toshi's Treasure 150
Misc Armory 100
Symmetric Ciphers CTRIME 70
Symmetric Ciphers Dancing Queen 120
Misc Lo-Hi Card Game 120
Mathematics Roll your Own 125
Mathematics No Way Back Home 100
RSA Blinding Light 120
RSA Null or Never 100
General Lemur XOR 40
Symmetric Ciphers Symmetry 50
Symmetric Ciphers Triple DES 60
Symmetric Ciphers Lazy CBC 60
Elliptic Curves Digestive 60
Elliptic Curves Curveball 100
Elliptic Curves Smooth Criminal 60
Elliptic Curves Efficient Exchange 50
Elliptic Curves Scalar Multiplication 35
Elliptic Curves Point Addition 30
Elliptic Curves Point Negation 10
Hash Functions MD0 80
Hash Functions PriMeD5 100
Hash Functions Hash Stuffing 50
Hash Functions Collider 50
Hash Functions Jack's Birthday Confusion 30
Hash Functions Jack's Birthday Hash 20
Crypto on the Web Token Appreciation 5
Crypto on the Web JWT Sessions 10
RSA RSA Backdoor Viability 175
RSA Ron was Wrong, Whit is Right 90
RSA Fast Primes 75
RSA Marin's Secrets 50
RSA Infinite Descent 50
RSA Endless Emails 150
Symmetric Ciphers Flipping Cookie 60
Symmetric Ciphers ECB CBC WTF 55
Symmetric Ciphers ECB Oracle 60
Misc Gotta Go Fast 40
CTF Archive RRSSAA (ECSC 2023 (Norway)) 0
Symmetric Ciphers Bean Counter 60
Symmetric Ciphers Passwords as Keys 50
Mathematics Quadratic Residues 25
Mathematics Legendre Symbol 35
Mathematics Vectors 10
Mathematics Size and Basis 15
Mathematics Gaussian Reduction 50
Diffie-Hellman Diffie-Hellman Starter 4 30
Diffie-Hellman Diffie-Hellman Starter 3 20
Diffie-Hellman Diffie-Hellman Starter 2 20
Diffie-Hellman Diffie-Hellman Starter 1 10
Mathematics Modular Square Root 35
Mathematics Chinese Remainder Theorem 40
Elliptic Curves Curves and Logs 40
RSA Square Eyes 35
RSA Inferius Prime 30
RSA Crossed Wires 100
RSA Everything is Big 70
RSA Modulus Inutilis 50
RSA Salty 20
RSA Manyprime 40
RSA Monoprime 30
RSA Factoring 15
RSA RSA Starter 6 25
RSA RSA Starter 5 20
RSA RSA Starter 4 20
RSA RSA Starter 3 20
RSA RSA Starter 2 15
RSA RSA Starter 1 10
General Extended GCD 20
Symmetric Ciphers Modes of Operation Starter 15
Symmetric Ciphers Bringing It All Together 50
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 You either know, XOR you don't 30
General Favourite byte 20
General Greatest Common Divisor 15
General Encoding Challenge 40
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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