Sechack

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Website: https://blog.sechack.kr

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Solved Challenges

Symmetric Ciphers Bringing It All Together 50
Hash Functions Collider 50
RSA Blinding Light 120
RSA Signing Server 60
RSA Crossed Wires 100
Diffie-Hellman Additive 70
RSA Ron was Wrong, Whit is Right 90
RSA Endless Emails 150
RSA Manyprime 40
Mathematics Chinese Remainder Theorem 40
RSA Infinite Descent 50
RSA Square Eyes 35
RSA Monoprime 30
General Lemur XOR 40
General Transparency 50
General Extended GCD 20
RSA Marin's Secrets 50
Symmetric Ciphers Bean Counter 60
Symmetric Ciphers ECB CBC WTF 55
Symmetric Ciphers Symmetry 50
General CERTainly not 30
General SSH Keys 35
General Modular Inverting 25
Diffie-Hellman Script Kiddie 70
Diffie-Hellman Static Client 100
Diffie-Hellman Computing Public Values 25
Diffie-Hellman Computing Shared Secrets 30
Diffie-Hellman Parameter Injection 60
Diffie-Hellman Deriving Symmetric Keys 40
Diffie-Hellman Working with Fields 10
RSA Everything is Still Big 100
RSA Everything is Big 70
RSA RSA Signatures 25
Symmetric Ciphers Lazy CBC 60
Symmetric Ciphers ECB Oracle 60
Symmetric Ciphers Diffusion through Permutation 30
Symmetric Ciphers Passwords as Keys 50
Symmetric Ciphers Modes of Operation Starter 15
Symmetric Ciphers Confusion through Substitution 25
Symmetric Ciphers Round Keys 20
Symmetric Ciphers Structure of AES 15
General Privacy-Enhanced Mail? 25
RSA Modulus Inutilis 50
RSA Salty 20
Symmetric Ciphers Keyed Permutations 5
Lattices LWE Background 5
RSA RSA Decryption 20
RSA Private Keys 20
RSA Inferius Prime 30
RSA Factoring 15
Crypto on the Web Sharks on the Wire 10
Crypto on the Web Secure Protocols 5
Crypto on the Web JSON in JSON 40
Crypto on the Web RSA or HMAC? 35
Crypto on the Web JWT Secrets 25
Crypto on the Web No Way JOSE 20
Misc No Leaks 100
Crypto on the Web JWT Sessions 10
Crypto on the Web Token Appreciation 5
Misc Gotta Go Fast 40
Symmetric Ciphers Resisting Bruteforce 10
RSA Public Keys 15
General You either know, XOR you don't 30
RSA Euler's Totient 20
RSA Modular Exponentiation 10
General Modular Arithmetic 2 20
General Modular Arithmetic 1 20
General Greatest Common Divisor 15
General Favourite byte 20
General XOR Properties 15
General XOR Starter 10
General Encoding Challenge 40
General Bytes and Big Integers 10
Introduction Network Attacks 5
General Base64 10
Introduction Great Snakes 3
General Hex 5
General ASCII 5
Introduction Finding Flags 2

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