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Solved Challenges

Isogenies The j-invariant 20
RSA Bespoke Padding 100
RSA Fast Primes 75
Symmetric Ciphers Oh SNAP 120
Symmetric Ciphers Paper Plane 120
Lattices LWE Background 5
Crypto on the Web JWT Secrets 25
Crypto on the Web TLS Handshake 15
Symmetric Ciphers Logon Zero 80
Crypto on the Web Secure Protocols 5
Hash Functions Merkle Trees 25
Diffie-Hellman Static Client 2 120
Misc Bit by Bit 100
Symmetric Ciphers The Good, The Pad, The Ugly 100
Symmetric Ciphers Pad Thai 80
Lattices Gaussian Reduction 50
RSA Endless Emails 150
Symmetric Ciphers Stream of Consciousness 80
Crypto on the Web Sharks on the Wire 10
Crypto on the Web No Way JOSE 20
Symmetric Ciphers CTRIME 70
Symmetric Ciphers Triple DES 60
Symmetric Ciphers Lazy CBC 60
General Transparency 50
General SSH Keys 35
RSA Everything is Big 70
Symmetric Ciphers Bean Counter 60
Symmetric Ciphers Bringing It All Together 50
General Encoding Challenge 40
RSA Everything is Still Big 100
RSA Infinite Descent 50
Isogenies Introduction to Isogenies 10
Elliptic Curves Efficient Exchange 50
Symmetric Ciphers Flipping Cookie 60
Diffie-Hellman Additive 70
Hash Functions Collider 50
Mathematics Unencryptable 125
Mathematics No Way Back Home 100
Symmetric Ciphers Symmetry 50
Symmetric Ciphers ECB Oracle 60
Symmetric Ciphers ECB CBC WTF 55
Symmetric Ciphers Passwords as Keys 50
General CERTainly not 30
RSA Modulus Inutilis 50
RSA Crossed Wires 100
General Privacy-Enhanced Mail? 25
Symmetric Ciphers Modes of Operation Starter 15
Mathematics Broken RSA 100
Diffie-Hellman Static Client 100
ZKPs Special Soundness 25
ZKPs Proofs of Knowledge 20
Diffie-Hellman Export-grade 100
Diffie-Hellman Parameter Injection 60
Elliptic Curves Curves and Logs 40
Symmetric Ciphers Diffusion through Permutation 30
Symmetric Ciphers Confusion through Substitution 25
Symmetric Ciphers Round Keys 20
Symmetric Ciphers Structure of AES 15
Elliptic Curves Scalar Multiplication 35
Mathematics Modular Binomials 80
Mathematics Modular Square Root 35
Diffie-Hellman Deriving Symmetric Keys 40
Elliptic Curves Point Addition 30
RSA Let's Decrypt 80
RSA Blinding Light 120
RSA Signing Server 60
RSA Marin's Secrets 50
Mathematics Successive Powers 60
Hash Functions Jack's Birthday Confusion 30
Hash Functions Jack's Birthday Hash 20
ZKPs ZKP Introduction 5
Lattices Gram Schmidt 30
Crypto on the Web JWT Sessions 10
Crypto on the Web Token Appreciation 5
General You either know, XOR you don't 30
Lattices What's a Lattice? 40
Lattices Size and Basis 15
Lattices Vectors 10
Diffie-Hellman Computing Shared Secrets 30
Diffie-Hellman Computing Public Values 25
Diffie-Hellman Generators of Groups 20
Diffie-Hellman Working with Fields 10
Misc Gotta Go Fast 40
Elliptic Curves Point Negation 10
RSA Salty 20
RSA Manyprime 40
RSA Square Eyes 35
RSA Monoprime 30
RSA Inferius Prime 30
RSA RSA Signatures 25
Elliptic Curves Background Reading 5
General Lemur XOR 40
Mathematics Adrien's Signs 80
Mathematics Legendre Symbol 35
General Favourite byte 20
Introduction Network Attacks 5
RSA RSA Decryption 20
Mathematics Chinese Remainder Theorem 40
RSA Factoring 15
RSA Private Keys 20
RSA Euler's Totient 20
RSA Public Keys 15
RSA Modular Exponentiation 10
Symmetric Ciphers Resisting Bruteforce 10
General Extended GCD 20
General Modular Inverting 25
General Modular Arithmetic 2 20
General Modular Arithmetic 1 20
General Greatest Common Divisor 15
General XOR Starter 10
Mathematics Quadratic Residues 25
Symmetric Ciphers Keyed Permutations 5
General XOR Properties 15
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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