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Solved Challenges

Hash Functions Hash Stuffing 50
RSA Signing Server 60
Lattices Nativity 60
Elliptic Curves Curveball 100
Elliptic Curves Moving Problems 150
Crypto on the Web JSON in JSON 40
Hash Functions Twin Keys 100
Hash Functions PriMeD5 100
RSA Bespoke Padding 100
RSA Let's Decrypt Again 175
Symmetric Ciphers Stream of Consciousness 80
Misc RSA vs RNG 150
Hash Functions No Difference 175
RSA Blinding Light 120
Lattices LWE Low Bits Message 20
Misc Nothing Up My Sleeve 150
Lattices LWE High Bits Message 15
Elliptic Curves Elliptic Nodes 150
Misc L-Win 120
RSA Fast Primes 75
Misc Jeff's LFSR 150
RSA Marin's Secrets 50
Elliptic Curves No Random, No Bias 120
RSA Endless Emails 150
RSA Everything is Still Big 100
Symmetric Ciphers Paper Plane 120
Symmetric Ciphers Oh SNAP 120
Hash Functions Jack's Birthday Confusion 30
Symmetric Ciphers Dancing Queen 120
Hash Functions Jack's Birthday Hash 20
Symmetric Ciphers Logon Zero 80
RSA Ron was Wrong, Whit is Right 90
RSA Crossed Wires 100
Misc Bruce Schneier's Password 100
Hash Functions MD0 80
Hash Functions Collider 50
Elliptic Curves Edwards Goes Degenerate 100
Symmetric Ciphers CTRIME 70
Diffie-Hellman The Matrix 75
RSA Square Eyes 35
Symmetric Ciphers Triple DES 60
Symmetric Ciphers Lazy CBC 60
Misc Gotta Go Fast 40
Misc No Leaks 100
RSA Everything is Big 70
RSA Infinite Descent 50
RSA Null or Never 100
Mathematics No Way Back Home 100
Elliptic Curves Micro Transmissions 120
Elliptic Curves Exceptional Curves 100
Elliptic Curves Smooth Criminal 60
Elliptic Curves Efficient Exchange 50
CTF Archive Calm Down (HKCERT CTF) 0
CTF Archive 1337crypt (DownUnderCTF) 0
Crypto on the Web Secure Protocols 5
Crypto on the Web No Way JOSE 20
RSA RSA Signatures 25
Symmetric Ciphers Flipping Cookie 60
RSA Modulus Inutilis 50
RSA Manyprime 40
RSA Salty 20
RSA Monoprime 30
RSA Inferius Prime 30
Symmetric Ciphers Bean Counter 60
Symmetric Ciphers Symmetry 50
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
Symmetric Ciphers Diffusion through Permutation 30
Symmetric Ciphers Confusion through Substitution 25
Crypto on the Web JWT Secrets 25
Crypto on the Web JWT Sessions 10
Crypto on the Web Token Appreciation 5
Lattices Too Many Errors 100
RSA RSA Backdoor Viability 175
RSA Factoring 15
RSA RSA Decryption 20
RSA Vote for Pedro 150
RSA Euler's Totient 20
RSA Private Keys 20
RSA Public Keys 15
RSA Modular Exponentiation 10
Symmetric Ciphers Round Keys 20
Symmetric Ciphers Structure of AES 15
Symmetric Ciphers Resisting Bruteforce 10
Symmetric Ciphers Keyed Permutations 5
Diffie-Hellman The Matrix Revolutions 125
Diffie-Hellman The Matrix Reloaded 100
Diffie-Hellman Script Kiddie 70
Diffie-Hellman Static Client 100
Diffie-Hellman Static Client 2 120
Diffie-Hellman Additive 70
Diffie-Hellman Export-grade 100
Diffie-Hellman Parameter Injection 60
Diffie-Hellman Deriving Symmetric Keys 40
Mathematics Ellipse Curve Cryptography 125
General Transparency 50
General SSH Keys 35
General CERTainly not 30
General Privacy-Enhanced Mail? 25
Mathematics Modular Square Root 35
Elliptic Curves Montgomery's Ladder 40
Elliptic Curves Scalar Multiplication 35
Elliptic Curves Curves and Logs 40
Elliptic Curves Point Addition 30
Elliptic Curves Point Negation 10
Elliptic Curves Background Reading 5
Diffie-Hellman Computing Shared Secrets 30
Diffie-Hellman Computing Public Values 25
Diffie-Hellman Generators of Groups 20
Diffie-Hellman Working with Fields 10
Mathematics Unencryptable 125
Mathematics Broken RSA 100
Mathematics Modular Binomials 80
Mathematics Successive Powers 60
Lattices Find the Lattice 100
Lattices Gaussian Reduction 50
Lattices What's a Lattice? 40
Mathematics Roll your Own 125
Mathematics Cofactor Cofantasy 150
Mathematics Real Eisenstein 150
Mathematics Prime and Prejudice 200
General Encoding Challenge 40
Mathematics Adrien's Signs 80
Lattices Backpack Cryptography 120
Lattices Gram Schmidt 30
Lattices Size and Basis 15
Lattices Vectors 10
Mathematics Chinese Remainder Theorem 40
Mathematics Legendre Symbol 35
Mathematics Quadratic Residues 25
Lattices From Private to Public Key LWE 25
Lattices LWE Intro 10
Lattices LWE Background 5
General Modular Inverting 25
General Modular Arithmetic 2 20
General Modular Arithmetic 1 20
General Extended GCD 20
General Lemur XOR 40
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 Network Attacks 5
Introduction Great Snakes 3
Introduction Finding Flags 2

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