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Solved Challenges

Isogenies Composite Isogenies 60
Isogenies Three Isogenies 35
Isogenies Two Isogenies 30
Isogenies DLOG on the Surface 40
Isogenies Montgomery Curves 30
Isogenies Image Point Arithmetic 30
Isogenies Where's the Supersingular Curve 25
Isogenies The j-invariant 20
Lattices LWE Intro 10
Lattices LWE Background 5
Lattices Backpack Cryptography 120
Crypto on the Web JSON in JSON 40
Crypto on the Web RSA or HMAC? 35
Crypto on the Web JWT Secrets 25
Misc Lo-Hi Card Game 120
Misc No Leaks 100
Misc Gotta Go Fast 40
Mathematics Broken RSA 100
Isogenies Introduction to Isogenies 10
RSA Let's Decrypt Again 175
RSA Vote for Pedro 150
RSA Blinding Light 120
RSA Let's Decrypt 80
RSA Signing Server 60
RSA Null or Never 100
RSA Bespoke Padding 100
RSA RSA Backdoor Viability 175
RSA Ron was Wrong, Whit is Right 90
RSA Marin's Secrets 50
RSA Fast Primes 75
RSA Infinite Descent 50
ZKPs ZKP Introduction 5
RSA Endless Emails 150
RSA Crossed Wires 100
RSA Everything is Big 70
RSA Everything is Still Big 100
RSA Square Eyes 35
RSA Inferius Prime 30
Elliptic Curves Digestive 60
Mathematics Prime and Prejudice 200
Mathematics Successive Powers 60
Symmetric Ciphers Pad Thai 80
Symmetric Ciphers Oh SNAP 120
Symmetric Ciphers Dancing Queen 120
Hash Functions Jack's Birthday Confusion 30
Hash Functions Jack's Birthday Hash 20
Symmetric Ciphers Stream of Consciousness 80
Symmetric Ciphers Logon Zero 80
Crypto on the Web No Way JOSE 20
Crypto on the Web JWT Sessions 10
Crypto on the Web Token Appreciation 5
Elliptic Curves Moving Problems 150
Elliptic Curves ProSign 3 100
Lattices Find the Lattice 100
Lattices Gaussian Reduction 50
Lattices What's a Lattice? 40
Lattices Gram Schmidt 30
Lattices Size and Basis 15
Lattices Vectors 10
Symmetric Ciphers CTRIME 70
Symmetric Ciphers Triple DES 60
Symmetric Ciphers Lazy CBC 60
General Transparency 50
General SSH Keys 35
General CERTainly not 30
General Privacy-Enhanced Mail? 25
General Lemur XOR 40
General Encoding Challenge 40
Elliptic Curves Curveball 100
Introduction Network Attacks 5
Elliptic Curves Smooth Criminal 60
Elliptic Curves Montgomery's Ladder 40
Elliptic Curves Efficient Exchange 50
Elliptic Curves Curves and Logs 40
Elliptic Curves Scalar Multiplication 35
Elliptic Curves Point Addition 30
Elliptic Curves Point Negation 10
Elliptic Curves Background Reading 5
Symmetric Ciphers Bean Counter 60
Symmetric Ciphers Symmetry 50
Symmetric Ciphers Flipping Cookie 60
Symmetric Ciphers ECB CBC WTF 55
Symmetric Ciphers ECB Oracle 60
Symmetric Ciphers Passwords as Keys 50
Symmetric Ciphers Modes of Operation Starter 15
Symmetric Ciphers Bringing It All Together 50
Diffie-Hellman Export-grade 100
Diffie-Hellman Parameter Injection 60
RSA Modulus Inutilis 50
RSA Salty 20
RSA Manyprime 40
RSA Monoprime 30
RSA Factoring 15
RSA RSA Signatures 25
RSA RSA Decryption 20
RSA Private Keys 20
RSA Euler's Totient 20
RSA Public Keys 15
RSA Modular Exponentiation 10
Symmetric Ciphers Diffusion through Permutation 30
Symmetric Ciphers Confusion through Substitution 25
Diffie-Hellman Deriving Symmetric Keys 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
Symmetric Ciphers Round Keys 20
Symmetric Ciphers Structure of AES 15
Symmetric Ciphers Resisting Bruteforce 10
Symmetric Ciphers Keyed Permutations 5
Mathematics Modular Binomials 80
Mathematics Adrien's Signs 80
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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