josephs

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Submitted Solutions

LFSR Destroyer 12
The Matrix Revolutions 18
Jeff's LFSR 1
Cofactor Cofantasy 36
Let's Decrypt Again 6
Toshi's Treasure 4

Solved Challenges

Isogenies Breaking SIDH 250
Isogenies A True Genus 175
Isogenies Meet me in the Claw 120
Isogenies Dual Masters 90
Isogenies Abelian SIDH 90
Isogenies Better than Linear 85
Isogenies André Encoding 80
Isogenies What's My Kernel 70
Isogenies CSIDH Key Exchange 90
Isogenies Twisted CSIDH Isogenies 70
Isogenies Secret Exponents 60
Isogenies Prime Power Isogenies 50
Isogenies Special Isogenies 30
Isogenies SIDH Key Exchange 80
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
Isogenies Introduction to Isogenies 10
ZKPs Mister Saplins The Prover 125
ZKPs Let's Prove It Again 175
ZKPs Let's Prove It 120
ZKPs Couples 100
ZKPs Mister Saplin's Preview 80
ZKPs Pairing-Based Cryptography 50
ZKPs Ticket Maestro 200
ZKPs Fischlin Transform 180
ZKPs Hamiltonicity 2 175
ZKPs Hamiltonicity 1 100
ZKPs OR Proof 75
ZKPs Too Honest 50
ZKPs Non-Interactive 35
ZKPs Honest Verifier Zero Knowledge 30
ZKPs Special Soundness 25
ZKPs Proofs of Knowledge 20
ZKPs ZKP Introduction 5
Lattices Bounded Noise 50
Elliptic Curves Checkpoint 150
Hash Functions WOTS Up 2 90
Hash Functions WOTS Up 75
Hash Functions Merkle Trees 25
Elliptic Curves An Exceptional Twisted Mind 125
Elliptic Curves A Twisted Mind 80
Elliptic Curves An Evil Twisted Mind 175
Symmetric Ciphers Oracular Spectacular 150
Symmetric Ciphers Pad Thai 80
Symmetric Ciphers The Good, The Pad, The Ugly 100
Lattices Missing Modulus 80
Crypto on the Web Megalomaniac 1 100
Crypto on the Web Megalomaniac 2 120
Lattices Noise Cheap 90
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 Megalomaniac 3 120
Misc RSA vs RNG 150
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
Lattices LWE Background 5
Elliptic Curves Digestive 60
Elliptic Curves Real Curve Crypto 200
Hash Functions MDFlag 125
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
Mathematics No Way Back Home 100
Symmetric Ciphers Beatboxer 150
Misc LFSR Destroyer 250
Mathematics Roll your Own 125
Diffie-Hellman The Matrix Revolutions 125
Diffie-Hellman The Matrix Reloaded 100
Symmetric Ciphers Dancing Queen 120
Crypto on the Web RSA or HMAC? Part 2 100
Diffie-Hellman The Matrix 75
Elliptic Curves Double and Broken 50
Elliptic Curves Montgomery's Ladder 40
Hash Functions Hash Stuffing 50
General SSH Keys 35
Misc Bruce Schneier's Password: Part 2 250
Misc Bruce Schneier's Password 100
Symmetric Ciphers Oh SNAP 120
Misc L-Win 120
Hash Functions Mixed Up 120
Crypto on the Web JSON in JSON 40
RSA RSA Backdoor Viability 175
Misc Jeff's LFSR 150
Symmetric Ciphers Logon Zero 80
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
Hash Functions Jack's Birthday Hash 20
Hash Functions Jack's Birthday Confusion 30
Mathematics Cofactor Cofantasy 150
Hash Functions Invariant 250
RSA Let's Decrypt Again 175
Elliptic Curves Edwards Goes Degenerate 100
Hash Functions No Difference 175
Misc Trust Games 150
Hash Functions Twin Keys 100
General Transparency 50
Elliptic Curves No Random, No Bias 120
Hash Functions PriMeD5 100
Mathematics Ellipse Curve Cryptography 125
RSA Let's Decrypt 80
Elliptic Curves Micro Transmissions 120
Mathematics Real Eisenstein 150
Misc Nothing Up My Sleeve 150
Lattices Backpack Cryptography 120
Elliptic Curves Moving Problems 150
Elliptic Curves Elliptic Nodes 150
Mathematics Unencryptable 125
Elliptic Curves Curveball 100
Lattices Too Many Errors 100
Misc Toshi's Treasure 150
Misc Lo-Hi Card Game 120
Diffie-Hellman Static Client 2 120
Hash Functions MD0 80
Hash Functions Collider 50
Symmetric Ciphers Forbidden Fruit 150
Symmetric Ciphers Triple DES 60
Symmetric Ciphers Paper Plane 120
Symmetric Ciphers Stream of Consciousness 80
Symmetric Ciphers Bean Counter 60
Symmetric Ciphers Symmetry 50
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
Symmetric Ciphers CTRIME 70
Elliptic Curves ProSign 3 100
Symmetric Ciphers Lazy CBC 60
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
Misc Armory 100
Elliptic Curves Exceptional Curves 100
Mathematics Prime and Prejudice 200
RSA Bespoke Padding 100
Misc Bit by Bit 100
Symmetric Ciphers Flipping Cookie 60
Symmetric Ciphers ECB CBC WTF 55
Symmetric Ciphers ECB Oracle 60
Mathematics Broken RSA 100
Misc No Leaks 100
Misc Gotta Go Fast 40
Symmetric Ciphers Resisting Bruteforce 10
Symmetric Ciphers Keyed Permutations 5
Mathematics Modular Square Root 35
Symmetric Ciphers Passwords as Keys 50
Symmetric Ciphers Modes of Operation Starter 15
RSA Crossed Wires 100
General XOR Properties 15
Mathematics Legendre Symbol 35
Mathematics Quadratic Residues 25
Elliptic Curves Smooth Criminal 60
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
Diffie-Hellman Script Kiddie 70
Diffie-Hellman Additive 70
Diffie-Hellman Static Client 100
Diffie-Hellman Export-grade 100
Diffie-Hellman Parameter Injection 60
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
RSA Vote for Pedro 150
RSA Blinding Light 120
RSA Signing Server 60
RSA Null or Never 100
RSA Ron was Wrong, Whit is Right 90
RSA Fast Primes 75
RSA Marin's Secrets 50
RSA Infinite Descent 50
RSA Endless Emails 150
RSA Everything is Still Big 100
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
Mathematics Modular Binomials 80
Mathematics Adrien's Signs 80
Mathematics Successive Powers 60
General CERTainly not 30
General Privacy-Enhanced Mail? 25
Mathematics Chinese Remainder Theorem 40
General Modular Inverting 25
General Modular Arithmetic 2 20
General Modular Arithmetic 1 20
General Extended GCD 20
General Greatest Common Divisor 15
General Lemur XOR 40
General You either know, XOR you don't 30
General Favourite byte 20
General XOR Starter 10
General Encoding Challenge 40
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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