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Solved Challenges

ZKPs Proofs of Knowledge 20
Crypto on the Web Saying Hello 20
Crypto on the Web No Way JOSE 20
RSA Salty 20
RSA RSA Decryption 20
RSA Private Keys 20
RSA Euler's Totient 20
General Favourite byte 20
General Modular Arithmetic 2 20
General Modular Arithmetic 1 20
General Extended GCD 20
Diffie-Hellman Generators of Groups 20
Symmetric Ciphers Round Keys 20
ZKPs Special Soundness 25
Crypto on the Web JWT Secrets 25
Lattices From Private to Public Key LWE 25
Mathematics Quadratic Residues 25
Isogenies Where's the Supersingular Curve 25
Hash Functions Merkle Trees 25
General Privacy-Enhanced Mail? 25
General Modular Inverting 25
Diffie-Hellman Computing Public Values 25
Symmetric Ciphers Confusion through Substitution 25
RSA RSA Signatures 25
Crypto on the Web Decrypting TLS 1.2 30
Symmetric Ciphers Diffusion through Permutation 30
ZKPs Honest Verifier Zero Knowledge 30
Isogenies Special Isogenies 30
Isogenies Montgomery Curves 30
Isogenies Image Point Arithmetic 30
Lattices Gram Schmidt 30
Hash Functions Jack's Birthday Confusion 30
General CERTainly not 30
Diffie-Hellman Computing Shared Secrets 30
General You either know, XOR you don't 30
RSA Inferius Prime 30
RSA Monoprime 30
Isogenies Two Isogenies 30
Elliptic Curves Point Addition 30
Isogenies Three Isogenies 35
ZKPs Non-Interactive 35
General SSH Keys 35
Elliptic Curves Scalar Multiplication 35
Mathematics Modular Square Root 35
Mathematics Legendre Symbol 35
RSA Square Eyes 35
Crypto on the Web RSA or HMAC? 35
Crypto on the Web Decrypting TLS 1.3 35
Crypto on the Web JSON in JSON 40
Crypto on the Web Authenticated Handshake 40
Isogenies DLOG on the Surface 40
General Encoding Challenge 40
Misc Gotta Go Fast 40
Lattices Noise Free 40
RSA Manyprime 40
Diffie-Hellman Deriving Symmetric Keys 40
Lattices What's a Lattice? 40
Mathematics Chinese Remainder Theorem 40
Elliptic Curves Curves and Logs 40
Elliptic Curves Montgomery's Ladder 40
ZKPs Pairing-Based Cryptography 50
ZKPs Too Honest 50
RSA Modulus Inutilis 50
RSA Marin's Secrets 50
RSA Infinite Descent 50
Lattices Bounded Noise 50
Hash Functions Collider 50
Hash Functions Hash Stuffing 50
General Transparency 50
Elliptic Curves Double and Broken 50
Elliptic Curves Efficient Exchange 50
Isogenies Prime Power Isogenies 50
Lattices Gaussian Reduction 50
Symmetric Ciphers Passwords as Keys 50
Symmetric Ciphers Symmetry 50
Symmetric Ciphers Bringing It All Together 50
Symmetric Ciphers ECB CBC WTF 55
Lattices Nativity 60
RSA Signing Server 60
Mathematics Successive Powers 60
Isogenies Secret Exponents 60
Isogenies Composite Isogenies 60
Elliptic Curves Digestive 60
Elliptic Curves Smooth Criminal 60
Diffie-Hellman Parameter Injection 60
Symmetric Ciphers Triple DES 60
Symmetric Ciphers Lazy CBC 60
Symmetric Ciphers ECB Oracle 60
Symmetric Ciphers Flipping Cookie 60
Symmetric Ciphers Bean Counter 60
Hash Functions Twin Keys 100
Isogenies What's My Kernel 70
Isogenies Twisted CSIDH Isogenies 70
Diffie-Hellman Script Kiddie 70
RSA Everything is Big 70
Symmetric Ciphers CTRIME 70
Diffie-Hellman Additive 70
Hash Functions WOTS Up 75
Diffie-Hellman The Matrix 75
ZKPs OR Proof 75
CTF Archive OR Proof (CryptoHack) 0
RSA Fast Primes 75
Symmetric Ciphers Stream of Consciousness 80
Symmetric Ciphers Pad Thai 80
Isogenies SIDH Key Exchange 80
ZKPs Mister Saplin's Preview 80
Lattices Missing Modulus 80
Hash Functions MD0 80
Symmetric Ciphers Logon Zero 80
Mathematics Modular Binomials 80
RSA Let's Decrypt 80
Elliptic Curves A Twisted Mind 80
Isogenies André Encoding 80
Mathematics Adrien's Signs 80
Isogenies Better than Linear 85
Hash Functions WOTS Up 2 90
RSA Ron was Wrong, Whit is Right 90
Lattices Noise Cheap 90
Isogenies Dual Masters 90
Isogenies CSIDH Key Exchange 90
Isogenies Abelian SIDH 90
Lattices Too Many Errors 100
Diffie-Hellman The Matrix Reloaded 100
Symmetric Ciphers The Good, The Pad, The Ugly 100
Diffie-Hellman Static Client 100
Crypto on the Web RSA or HMAC? Part 2 100
Elliptic Curves ProSign 3 100
Hash Functions PriMeD5 100
RSA Null or Never 100
Mathematics No Way Back Home 100
Misc No Leaks 100
Crypto on the Web Megalomaniac 1 100
ZKPs Hamiltonicity 1 100
CTF Archive Hamiltonicity (CryptoHack) 0
Lattices Find the Lattice 100
Diffie-Hellman Export-grade 100
Elliptic Curves Exceptional Curves 100
RSA Everything is Still Big 100
Elliptic Curves Edwards Goes Degenerate 100
Elliptic Curves Curveball 100
RSA Crossed Wires 100
ZKPs Couples 100
Misc Bruce Schneier's Password 100
Mathematics Broken RSA 100
Misc Bit by Bit 100
RSA Bespoke Padding 100
Misc Armory 100
Diffie-Hellman Static Client 2 120
Symmetric Ciphers Paper Plane 120
Symmetric Ciphers Oh SNAP 120
Elliptic Curves No Random, No Bias 120
Hash Functions Mixed Up 120
Elliptic Curves Micro Transmissions 120
Crypto on the Web Megalomaniac 3 120
Crypto on the Web Megalomaniac 2 120
Isogenies Meet me in the Claw 120
Misc Lo-Hi Card Game 120
ZKPs Let's Prove It 120
Misc L-Win 120
Symmetric Ciphers Dancing Queen 120
RSA Blinding Light 120
Lattices Backpack Cryptography 120
ZKPs Mister Saplins The Prover 125
Elliptic Curves An Exceptional Twisted Mind 125
Hash Functions MDFlag 125
Diffie-Hellman The Matrix Revolutions 125
Mathematics Roll your Own 125
Mathematics Ellipse Curve Cryptography 125
Mathematics Unencryptable 125
Elliptic Curves Checkpoint 150
Misc Jeff's LFSR 150
Misc Trust Games 150
Symmetric Ciphers Oracular Spectacular 150
Misc RSA vs RNG 150
Misc Nothing Up My Sleeve 150
Misc Toshi's Treasure 150
Symmetric Ciphers Beatboxer 150
Symmetric Ciphers Forbidden Fruit 150
Mathematics Cofactor Cofantasy 150
Elliptic Curves Elliptic Nodes 150
Mathematics Real Eisenstein 150
RSA Vote for Pedro 150
Elliptic Curves Moving Problems 150
RSA Endless Emails 150
CTF Archive Hamiltonicity 2 (CryptoHack) 0
ZKPs Hamiltonicity 2 175
Isogenies A True Genus 175
ZKPs Let's Prove It Again 175
Elliptic Curves An Evil Twisted Mind 175
Hash Functions No Difference 175
RSA Let's Decrypt Again 175
RSA RSA Backdoor Viability 175
CTF Archive Fischlin's Transformation (CryptoHack) 0
ZKPs Fischlin Transform 180
CTF Archive Ticket Maestro (CryptoHack) 0
ZKPs Ticket Maestro 200
Mathematics Prime and Prejudice 200
Elliptic Curves Real Curve Crypto 200
Misc Bruce Schneier's Password: Part 2 250
Misc LFSR Destroyer 250
Isogenies Breaking SIDH 250
Hash Functions Invariant 250

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