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Solved Challenges

Crypto on the Web RSA or HMAC? Part 2 100
Hash Functions WOTS Up 2 90
Hash Functions WOTS Up 75
Hash Functions Merkle Trees 25
Hash Functions Invariant 250
Hash Functions Mixed Up 120
Hash Functions MDFlag 125
Hash Functions No Difference 175
Hash Functions Twin Keys 100
Hash Functions PriMeD5 100
Hash Functions Hash Stuffing 50
Hash Functions Collider 50
Symmetric Ciphers Beatboxer 150
Symmetric Ciphers Forbidden Fruit 150
Symmetric Ciphers Paper Plane 120
Symmetric Ciphers The Good, The Pad, The Ugly 100
Diffie-Hellman The Matrix Revolutions 125
Diffie-Hellman The Matrix Reloaded 100
Diffie-Hellman The Matrix 75
Diffie-Hellman Script Kiddie 70
Diffie-Hellman Static Client 2 120
Diffie-Hellman Additive 70
Diffie-Hellman Static Client 100
Symmetric Ciphers Oh SNAP 120
Mathematics Prime and Prejudice 200
Mathematics Real Eisenstein 150
Mathematics Cofactor Cofantasy 150
Mathematics Roll your Own 125
Mathematics Ellipse Curve Cryptography 125
Mathematics No Way Back Home 100
RSA Let's Decrypt Again 175
RSA Vote for Pedro 150
RSA Blinding Light 120
RSA Let's Decrypt 80
RSA Signing Server 60
RSA Null or Never 100
RSA Bespoke Padding 100
RSA RSA Backdoor Viability 175
RSA Fast Primes 75
RSA Marin's Secrets 50
RSA Infinite Descent 50
Mathematics Broken RSA 100
Symmetric Ciphers Pad Thai 80
Symmetric Ciphers Dancing Queen 120
Symmetric Ciphers Logon Zero 80
Symmetric Ciphers Symmetry 50
Symmetric Ciphers Stream of Consciousness 80
RSA Ron was Wrong, Whit is Right 90
Hash Functions MD0 80
Diffie-Hellman Export-grade 100
Symmetric Ciphers CTRIME 70
RSA Endless Emails 150
RSA Crossed Wires 100
Symmetric Ciphers Bean Counter 60
Symmetric Ciphers Triple DES 60
Symmetric Ciphers ECB CBC WTF 55
Symmetric Ciphers ECB Oracle 60
Mathematics Unencryptable 125
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
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
ZKPs ZKP Introduction 5
Misc Gotta Go Fast 40
Isogenies Introduction to Isogenies 10
Symmetric Ciphers Lazy CBC 60
Symmetric Ciphers Flipping Cookie 60
Diffie-Hellman Parameter Injection 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
Symmetric Ciphers Round Keys 20
Mathematics Modular Binomials 80
Mathematics Adrien's Signs 80
Mathematics Successive Powers 60
Mathematics Modular Square Root 35
Mathematics Legendre Symbol 35
Diffie-Hellman Deriving Symmetric Keys 40
Diffie-Hellman Computing Shared Secrets 30
Diffie-Hellman Computing Public Values 25
Diffie-Hellman Generators of Groups 20
CTF Archive Hyper512 (HITCON CTF) 0
CTF Archive ECLCG (HITCON CTF) 0
CTF Archive Additional problems (CSC Belgium) 0
CTF Archive unrandom DSA (HackTM CTF) 0
CTF Archive kaitenzushi (HackTM CTF) 0
CTF Archive d-phi-enc (HackTM CTF) 0
CTF Archive broken oracle (HackTM CTF) 0
CTF Archive What a Curve! (Breizh CTF) 0
CTF Archive Twist and shout (ECSC 2023 (Norway)) 0
CTF Archive Tough decisions (ECSC 2023 (Norway)) 0
CTF Archive Sus (ImaginaryCTF) 0
CTF Archive Share (HITCON CTF) 0
CTF Archive RRSSAA (ECSC 2023 (Norway)) 0
CTF Archive Put a ring on it (ECSC 2023 (Norway)) 0
CTF Archive Leet Universe (ImaginaryCTF (Daily)) 0
CTF Archive Irish flan (ECSC 2023 (Norway)) 0
CTF Archive Hide and seek (ECSC 2023 (Norway)) 0
CTF Archive GLP420 (HackTM CTF) 0
CTF Archive Blind (ECSC 2023 (Norway)) 0
CTF Archive Signature (TSJ CTF) 0
CTF Archive pekobot (AIS3 Pre-Exam) 0
CTF Archive RSA Secret Sharing (WACON) 0
CTF Archive RSA Permutation (WACON) 0
CTF Archive Probability (SEETF) 0
CTF Archive Maybe Someday (GoogleCTF) 0
CTF Archive Maybe Someday (Maybe Someday CTF) 0
CTF Archive Key recovery (DCTF) 0
CTF Archive Unbalanced (ICC Athens) 0
CTF Archive ed25519 magic (ICC Athens) 0
CTF Archive Functional (ICC Athens) 0
CTF Archive diffecient (SekaiCTF) 0
CTF Archive FaILProof Revenge (SekaiCTF) 0
CTF Archive FaILProof (SekaiCTF) 0
CTF Archive Dark Arts (CODEGATE CTF) 0
CTF Archive Lack of Entropy (Firebird Internal CTF) 0
CTF Archive C0ll1d3r (Firebird Internal CTF) 0
CTF Archive Authenticator (Firebird Internal CTF) 0
CTF Archive Unimplemented (TETCTF) 0
CTF Archive Unevaluated (TETCTF) 0
CTF Archive SpongeBob SquarePants / Battle for Bikini Bottom - Rehydrated (HTB Cyber Apocalypse) 0
CTF Archive import numpy as MT (Zh3r0 CTF V2) 0
CTF Archive Twist and Shout (Zh3r0 CTF V2) 0
CTF Archive Substitution Cipher III (DownUnderCTF) 0
CTF Archive Real Mersenne (Zh3r0 CTF V2) 0
CTF Archive Oofbleck (Firebird Internal CTF) 0
CTF Archive Tenet: The Plagarism (HKCERT CTF) 0
CTF Archive Sratslla SEA (HKCERT CTF) 0
CTF Archive Sign In Please, Again (HKCERT CTF) 0
CTF Archive Key Backup Service 2 (HKCERT CTF) 0
CTF Archive Key Backup Service 1 (HKCERT CTF) 0
CTF Archive Cipher Mode Picker (HKCERT CTF) 0
CTF Archive Chaos (Zh3r0 CTF V2) 0
CTF Archive A Joke Cipher (HKCERT CTF) 0
CTF Archive 1n_jection (Zh3r0 CTF V2) 0
CTF Archive 1337crypt v2 (DownUnderCTF) 0
CTF Archive 2020 (TETCTF) 0
CTF Archive 1337crypt (DownUnderCTF) 0
CTF Archive Calm Down (HKCERT CTF) 0
CTF Archive Sign in Please (HKCERT CTF) 0
RSA Everything is Still Big 100
Mathematics Chinese Remainder Theorem 40
RSA Everything is Big 70
RSA Modulus Inutilis 50
RSA Salty 20
RSA RSA Signatures 25
RSA RSA Decryption 20
RSA Inferius Prime 30
RSA Manyprime 40
General Transparency 50
General SSH Keys 35
General CERTainly not 30
General Privacy-Enhanced Mail? 25
General Lemur XOR 40
General Encoding Challenge 40
Introduction Network Attacks 5
Hash Functions Jack's Birthday Confusion 30
Hash Functions Jack's Birthday Hash 20
Elliptic Curves Background Reading 5
Diffie-Hellman Working with Fields 10
RSA Square Eyes 35
RSA Monoprime 30
RSA Factoring 15
RSA Private Keys 20
RSA Euler's Totient 20
RSA Public Keys 15
RSA Modular Exponentiation 10
Mathematics Quadratic Residues 25
Symmetric Ciphers Structure of AES 15
Symmetric Ciphers Resisting Bruteforce 10
Symmetric Ciphers Keyed Permutations 5
General Modular Inverting 25
General Modular Arithmetic 2 20
General You either know, XOR you don't 30
General Favourite byte 20
General XOR Properties 15
Lattices LWE Background 5
General XOR Starter 10
General Modular Arithmetic 1 20
General Extended GCD 20
General Greatest Common Divisor 15
General Bytes and Big Integers 10
General Base64 10
General Hex 5
General ASCII 5
Introduction Great Snakes 3
Introduction Finding Flags 2

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