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Solved Challenges

ZKPs ZKP Introduction 5
Isogenies Image Point Arithmetic 30
Isogenies The j-invariant 20
Isogenies Where's the Supersingular Curve 25
Diffie-Hellman The Matrix 75
Lattices Too Many Errors 100
Lattices Noise Cheap 90
Lattices Missing Modulus 80
Lattices Nativity 60
Lattices Noise Free 40
Lattices From Private to Public Key LWE 25
Lattices LWE Low Bits Message 20
Lattices LWE High Bits Message 15
Lattices LWE Intro 10
Elliptic Curves Real Curve Crypto 200
Elliptic Curves Double and Broken 50
Elliptic Curves Montgomery's Ladder 40
Elliptic Curves Edwards Goes Degenerate 100
Elliptic Curves No Random, No Bias 120
Elliptic Curves ProSign 3 100
Elliptic Curves Digestive 60
Elliptic Curves Smooth Criminal 60
Lattices LWE Background 5
RSA Let's Decrypt Again 175
Diffie-Hellman The Matrix Revolutions 125
Diffie-Hellman The Matrix Reloaded 100
Mathematics Cofactor Cofantasy 150
Mathematics Prime and Prejudice 200
Symmetric Ciphers Oh SNAP 120
Hash Functions Mixed Up 120
Hash Functions Twin Keys 100
Hash Functions No Difference 175
Hash Functions PriMeD5 100
Hash Functions Collider 50
Elliptic Curves Curveball 100
RSA Blinding Light 120
RSA Let's Decrypt 80
RSA Vote for Pedro 150
Hash Functions Hash Stuffing 50
Elliptic Curves Micro Transmissions 120
Elliptic Curves Exceptional Curves 100
Elliptic Curves Moving Problems 150
Elliptic Curves Elliptic Nodes 150
Diffie-Hellman Additive 70
Diffie-Hellman Static Client 2 120
Diffie-Hellman Script Kiddie 70
RSA RSA Backdoor Viability 175
Mathematics Roll your Own 125
Mathematics Ellipse Curve Cryptography 125
Mathematics No Way Back Home 100
Crypto on the Web Saying Hello 20
Crypto on the Web TLS Handshake 15
Crypto on the Web Sharks on the Wire 10
Crypto on the Web Secure Protocols 5
Crypto on the Web JWT Sessions 10
Hash Functions Jack's Birthday Confusion 30
Hash Functions Jack's Birthday Hash 20
Symmetric Ciphers Bean Counter 60
Lattices Backpack Cryptography 120
Mathematics Real Eisenstein 150
Lattices Find the Lattice 100
Mathematics Broken RSA 100
Mathematics Unencryptable 125
Elliptic Curves Point Negation 10
General SSH Keys 35
General Transparency 50
Crypto on the Web JWT Secrets 25
Crypto on the Web JSON in JSON 40
Crypto on the Web RSA or HMAC? 35
Crypto on the Web No Way JOSE 20
Elliptic Curves Scalar Multiplication 35
Elliptic Curves Point Addition 30
Elliptic Curves Efficient Exchange 50
Elliptic Curves Curves and Logs 40
Symmetric Ciphers Symmetry 50
Hash Functions MD0 80
Diffie-Hellman Parameter Injection 60
Diffie-Hellman Export-grade 100
Diffie-Hellman Static Client 100
Crypto on the Web Token Appreciation 5
Lattices Gaussian Reduction 50
Lattices What's a Lattice? 40
Symmetric Ciphers CTRIME 70
Symmetric Ciphers Stream of Consciousness 80
Symmetric Ciphers Logon Zero 80
Symmetric Ciphers Triple DES 60
RSA Bespoke Padding 100
Mathematics Modular Binomials 80
Symmetric Ciphers Flipping Cookie 60
Lattices Gram Schmidt 30
Lattices Size and Basis 15
Lattices Vectors 10
Misc No Leaks 100
RSA Null or Never 100
Symmetric Ciphers Lazy CBC 60
Symmetric Ciphers ECB CBC WTF 55
Symmetric Ciphers Passwords as Keys 50
Symmetric Ciphers ECB Oracle 60
RSA Ron was Wrong, Whit is Right 90
RSA Fast Primes 75
Diffie-Hellman Deriving Symmetric Keys 40
Symmetric Ciphers Bringing It All Together 50
RSA Signing Server 60
RSA Endless Emails 150
Mathematics Adrien's Signs 80
RSA Marin's Secrets 50
RSA Infinite Descent 50
Misc Gotta Go Fast 40
General Encoding Challenge 40
Symmetric Ciphers Keyed Permutations 5
Mathematics Successive Powers 60
RSA Crossed Wires 100
Symmetric Ciphers Diffusion through Permutation 30
Symmetric Ciphers Confusion through Substitution 25
Symmetric Ciphers Round Keys 20
Symmetric Ciphers Structure of AES 15
Symmetric Ciphers Resisting Bruteforce 10
Mathematics Modular Square Root 35
RSA Everything is Still Big 100
Symmetric Ciphers Modes of Operation Starter 15
RSA Manyprime 40
Diffie-Hellman Computing Shared Secrets 30
RSA Everything is Big 70
RSA Salty 20
RSA Monoprime 30
RSA Square Eyes 35
Elliptic Curves Background Reading 5
RSA Modulus Inutilis 50
RSA Inferius Prime 30
General CERTainly not 30
General Privacy-Enhanced Mail? 25
Introduction Network Attacks 5
Introduction Great Snakes 3
Mathematics Legendre Symbol 35
General Lemur XOR 40
General XOR Properties 15
Diffie-Hellman Generators of Groups 20
Diffie-Hellman Computing Public Values 25
Diffie-Hellman Working with Fields 10
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
Mathematics Chinese Remainder Theorem 40
General You either know, XOR you don't 30
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 Favourite byte 20
General XOR Starter 10
General Bytes and Big Integers 10
General Base64 10
General Hex 5
General ASCII 5
Introduction Finding Flags 2

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