OBIKA

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Solved Challenges

Introduction Network Attacks 5
Crypto on the Web No Way JOSE 20
Crypto on the Web Token Appreciation 5
Crypto on the Web JWT Secrets 25
Crypto on the Web JSON in JSON 40
Symmetric Ciphers Lazy CBC 60
Symmetric Ciphers ECB CBC WTF 55
Symmetric Ciphers Triple DES 60
Symmetric Ciphers ECB Oracle 60
Symmetric Ciphers Flipping Cookie 60
Symmetric Ciphers Passwords as Keys 50
Symmetric Ciphers Bean Counter 60
Symmetric Ciphers CTRIME 70
General SSH Keys 35
General CERTainly not 30
Diffie-Hellman Generators of Groups 20
Diffie-Hellman Working with Fields 10
Diffie-Hellman Computing Public Values 25
Diffie-Hellman Computing Shared Secrets 30
Diffie-Hellman Deriving Symmetric Keys 40
Diffie-Hellman Script Kiddie 70
Misc Gotta Go Fast 40
Misc Bit by Bit 100
Misc Armory 100
Symmetric Ciphers Modes of Operation Starter 15
Symmetric Ciphers Symmetry 50
RSA Euler's Totient 20
RSA Public Keys 15
RSA Modular Exponentiation 10
RSA RSA Decryption 20
RSA Private Keys 20
RSA Inferius Prime 30
RSA Factoring 15
RSA Square Eyes 35
RSA Monoprime 30
RSA Salty 20
RSA Manyprime 40
RSA Everything is Big 70
RSA Modulus Inutilis 50
RSA Everything is Still Big 100
RSA Crossed Wires 100
RSA Infinite Descent 50
RSA Marin's Secrets 50
General Privacy-Enhanced Mail? 25
General Transparency 50
RSA Ron was Wrong, Whit is Right 90
Hash Functions Collider 50
Mathematics Adrien's Signs 80
General Lemur XOR 40
Mathematics Modular Binomials 80
General Encoding Challenge 40
Mathematics Chinese Remainder Theorem 40
Mathematics Modular Square Root 35
Mathematics Legendre Symbol 35
Mathematics Quadratic Residues 25
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 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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