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Solved Challenges

Hash Functions Invariant 250
Lattices Nativity 60
Hash Functions MDFlag 125
Misc Trust Games 150
Elliptic Curves Digestive 60
Misc L-Win 120
Mathematics Roll your Own 125
Lattices Noise Free 40
Lattices LWE Low Bits Message 20
Crypto on the Web Authenticated Handshake 40
Crypto on the Web Decrypting TLS 1.3 35
Crypto on the Web Decrypting TLS 1.2 30
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
Lattices From Private to Public Key LWE 25
Lattices LWE High Bits Message 15
Lattices LWE Intro 10
Lattices LWE Background 5
Symmetric Ciphers Forbidden Fruit 150
Mathematics No Way Back Home 100
Misc Jeff's LFSR 150
Misc Bruce Schneier's Password 100
Lattices Too Many Errors 100
Hash Functions Mixed Up 120
RSA Let's Decrypt Again 175
Misc Toshi's Treasure 150
Hash Functions No Difference 175
Mathematics Prime and Prejudice 200
Symmetric Ciphers Dancing Queen 120
Elliptic Curves Montgomery's Ladder 40
Elliptic Curves Double and Broken 50
Diffie-Hellman The Matrix Reloaded 100
Diffie-Hellman The Matrix 75
Crypto on the Web RSA or HMAC? Part 2 100
Crypto on the Web JSON in JSON 40
Hash Functions Twin Keys 100
Hash Functions PriMeD5 100
Symmetric Ciphers Logon Zero 80
Hash Functions Hash Stuffing 50
General SSH Keys 35
Misc Nothing Up My Sleeve 150
Misc Lo-Hi Card Game 120
Symmetric Ciphers Paper Plane 120
Elliptic Curves Edwards Goes Degenerate 100
Elliptic Curves No Random, No Bias 120
Mathematics Cofactor Cofantasy 150
Misc Bit by Bit 100
Hash Functions MD0 80
Symmetric Ciphers Triple DES 60
Mathematics Ellipse Curve Cryptography 125
RSA Let's Decrypt 80
RSA Bespoke Padding 100
Mathematics Real Eisenstein 150
Lattices Backpack Cryptography 120
RSA RSA Backdoor Viability 175
Misc Armory 100
Mathematics Modular Binomials 80
Diffie-Hellman Static Client 2 120
Hash Functions Collider 50
Diffie-Hellman Static Client 100
Lattices Find the Lattice 100
Mathematics Unencryptable 125
Mathematics Broken RSA 100
Crypto on the Web RSA or HMAC? 35
Crypto on the Web JWT Secrets 25
Crypto on the Web No Way JOSE 20
Crypto on the Web JWT Sessions 10
Crypto on the Web Token Appreciation 5
Lattices Gaussian Reduction 50
Lattices What's a Lattice? 40
Lattices Gram Schmidt 30
Hash Functions Jack's Birthday Hash 20
Hash Functions Jack's Birthday Confusion 30
Symmetric Ciphers Bringing It All Together 50
Symmetric Ciphers Diffusion through Permutation 30
Symmetric Ciphers Confusion through Substitution 25
Symmetric Ciphers Round Keys 20
Symmetric Ciphers Structure of AES 15
Lattices Size and Basis 15
Lattices Vectors 10
General Transparency 50
Elliptic Curves Moving Problems 150
Symmetric Ciphers Resisting Bruteforce 10
Symmetric Ciphers Keyed Permutations 5
Mathematics Modular Square Root 35
RSA Fast Primes 75
RSA Ron was Wrong, Whit is Right 90
RSA Crossed Wires 100
RSA Null or Never 100
RSA Vote for Pedro 150
RSA Endless Emails 150
Diffie-Hellman Script Kiddie 70
Elliptic Curves Elliptic Nodes 150
Elliptic Curves Micro Transmissions 120
Elliptic Curves ProSign 3 100
Elliptic Curves Curveball 100
Elliptic Curves Exceptional Curves 100
Elliptic Curves Smooth Criminal 60
Elliptic Curves Efficient Exchange 50
Elliptic Curves Curves and Logs 40
Diffie-Hellman Additive 70
Diffie-Hellman Export-grade 100
Diffie-Hellman Parameter Injection 60
Diffie-Hellman Deriving Symmetric Keys 40
RSA Blinding Light 120
RSA Signing Server 60
Mathematics Successive Powers 60
Mathematics Adrien's Signs 80
General CERTainly not 30
General Privacy-Enhanced Mail? 25
General Lemur XOR 40
Misc No Leaks 100
Misc Gotta Go Fast 40
General XOR Properties 15
RSA Everything is Still Big 100
Diffie-Hellman Computing Shared Secrets 30
Diffie-Hellman Computing Public Values 25
Diffie-Hellman Generators of Groups 20
Diffie-Hellman Working with Fields 10
Elliptic Curves Scalar Multiplication 35
Elliptic Curves Point Addition 30
Elliptic Curves Point Negation 10
Mathematics Chinese Remainder Theorem 40
Mathematics Legendre Symbol 35
Mathematics Quadratic Residues 25
General Modular Inverting 25
General Modular Arithmetic 2 20
General Modular Arithmetic 1 20
RSA Infinite Descent 50
RSA Marin's Secrets 50
RSA Everything is Big 70
RSA Modulus Inutilis 50
RSA Salty 20
RSA Manyprime 40
RSA Square Eyes 35
RSA Monoprime 30
RSA Inferius Prime 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 Stream of Consciousness 80
Symmetric Ciphers CTRIME 70
Symmetric Ciphers Bean Counter 60
Symmetric Ciphers Symmetry 50
Symmetric Ciphers Lazy CBC 60
Symmetric Ciphers Flipping Cookie 60
Symmetric Ciphers ECB CBC WTF 55
Symmetric Ciphers ECB Oracle 60
Symmetric Ciphers Passwords as Keys 50
General You either know, XOR you don't 30
General Favourite byte 20
General Encoding Challenge 40
General XOR Starter 10
General Extended GCD 20
General Greatest Common Divisor 15
Symmetric Ciphers Modes of Operation Starter 15
Elliptic Curves Background Reading 5
General Bytes and Big Integers 10
General Base64 10
General Hex 5
General ASCII 5
Introduction Network Attacks 5
Introduction Great Snakes 3
Introduction Finding Flags 2

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