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Solved Challenges

Symmetric Ciphers Round Keys 20
Symmetric Ciphers Confusion through Substitution 25
Symmetric Ciphers Bringing It All Together 50
Symmetric Ciphers Passwords as Keys 50
Symmetric Ciphers ECB Oracle 60
Symmetric Ciphers ECB CBC WTF 55
Symmetric Ciphers Flipping Cookie 60
Symmetric Ciphers Symmetry 50
Symmetric Ciphers Bean Counter 60
Symmetric Ciphers Lazy CBC 60
Symmetric Ciphers Triple DES 60
Symmetric Ciphers CTRIME 70
Symmetric Ciphers Logon Zero 80
Symmetric Ciphers Structure of AES 15
Mathematics Successive Powers 60
Isogenies Introduction to Isogenies 10
RSA Factoring 15
Lattices Size and Basis 15
Lattices Vectors 10
Hash Functions Jack's Birthday Confusion 30
Hash Functions Jack's Birthday Hash 20
General Modular Inverting 25
General Modular Arithmetic 2 20
General Modular Arithmetic 1 20
General Extended GCD 20
General Greatest Common Divisor 15
General You either know, XOR you don't 30
General Encoding Challenge 40
Mathematics Modular Square Root 35
Mathematics Chinese Remainder Theorem 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
Mathematics Quadratic Residues 25
Mathematics Legendre Symbol 35
RSA RSA Signatures 25
RSA RSA Decryption 20
RSA Private Keys 20
RSA Euler's Totient 20
RSA Public Keys 15
Symmetric Ciphers Diffusion through Permutation 30
Crypto on the Web Token Appreciation 5
Crypto on the Web JWT Sessions 10
RSA Modular Exponentiation 10
Introduction Network Attacks 5
Symmetric Ciphers Resisting Bruteforce 10
Symmetric Ciphers Keyed Permutations 5
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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