r_karoly

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Solved Challenges

Crypto on the Web JSON in JSON 40
Crypto on the Web RSA or HMAC? 35
Crypto on the Web JWT Secrets 25
Hash Functions Hash Stuffing 50
General SSH Keys 35
Hash Functions Jack's Birthday Hash 20
Misc Bruce Schneier's Password 100
Diffie-Hellman Static Client 100
RSA Endless Emails 150
Crypto on the Web No Way JOSE 20
Crypto on the Web JWT Sessions 10
Crypto on the Web Token Appreciation 5
General Transparency 50
Elliptic Curves Efficient Exchange 50
Elliptic Curves Curves and Logs 40
Elliptic Curves Point Addition 30
Elliptic Curves Scalar Multiplication 35
Diffie-Hellman Script Kiddie 70
Elliptic Curves Point Negation 10
Diffie-Hellman Export-grade 100
Elliptic Curves Background Reading 5
Mathematics Gaussian Reduction 50
Mathematics What's a Lattice? 40
Symmetric Ciphers Stream of Consciousness 80
Symmetric Ciphers Bean Counter 60
RSA Signing Server 60
Diffie-Hellman Parameter Injection 60
Misc Lo-Hi Card Game 120
Misc No Leaks 100
Hash Functions Collider 50
Mathematics Vectors 10
Mathematics Size and Basis 15
RSA Marin's Secrets 50
RSA Infinite Descent 50
RSA Square Eyes 35
Diffie-Hellman Diffie-Hellman Starter 5 40
Diffie-Hellman Diffie-Hellman Starter 4 30
RSA RSA Starter 6 25
RSA Manyprime 40
RSA Monoprime 30
RSA Inferius Prime 30
Mathematics Modular Square Root 35
RSA Modulus Inutilis 50
RSA Salty 20
Symmetric Ciphers Lazy CBC 60
Misc Gotta Go Fast 40
Symmetric Ciphers Flipping Cookie 60
Symmetric Ciphers Symmetry 50
Symmetric Ciphers ECB CBC WTF 55
Symmetric Ciphers ECB Oracle 60
Symmetric Ciphers Bringing It All Together 50
Symmetric Ciphers Keyed Permutations 5
Symmetric Ciphers Resisting Bruteforce 10
Symmetric Ciphers Diffusion through Permutation 30
Symmetric Ciphers Confusion through Substitution 25
Symmetric Ciphers Round Keys 20
Symmetric Ciphers Structure of AES 15
Mathematics Successive Powers 60
Mathematics Adrien's Signs 80
Diffie-Hellman Diffie-Hellman Starter 2 20
Diffie-Hellman Diffie-Hellman Starter 3 20
RSA RSA Starter 5 20
RSA RSA Starter 4 20
RSA RSA Starter 3 20
RSA RSA Starter 2 15
Mathematics Chinese Remainder Theorem 40
Mathematics Legendre Symbol 35
Diffie-Hellman Diffie-Hellman Starter 1 10
Mathematics Quadratic Residues 25
General Modular Inverting 25
Symmetric Ciphers Passwords as Keys 50
RSA Factoring 15
RSA RSA Starter 1 10
Symmetric Ciphers Modes of Operation Starter 15
General CERTainly not 30
General Privacy-Enhanced Mail? 25
General Modular Arithmetic 2 20
General Modular Arithmetic 1 20
General Encoding Challenge 40
General Extended GCD 20
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 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

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