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Solved Challenges

CTF Archive Unevaluated (TETCTF) 0
CTF Archive Unimplemented (TETCTF) 0
CTF Archive 1337crypt (DownUnderCTF) 0
CTF Archive 2020 (TETCTF) 0
CTF Archive Calm Down (HKCERT CTF) 0
CTF Archive Sign in Please (HKCERT CTF) 0
Crypto on the Web Saying Hello 20
Crypto on the Web TLS Handshake 15
Crypto on the Web Sharks on the Wire 10
Hash Functions MDFlag 125
Symmetric Ciphers Beatboxer 150
Mathematics No Way Back Home 100
Crypto on the Web Secure Protocols 5
Elliptic Curves Real Curve Crypto 200
Elliptic Curves Double and Broken 50
Elliptic Curves Montgomery's Ladder 40
Elliptic Curves Smooth Criminal 60
Hash Functions Collider 50
Hash Functions Hash Stuffing 50
Crypto on the Web RSA or HMAC? Part 2 100
Crypto on the Web JSON in JSON 40
RSA Let's Decrypt 80
RSA Signing Server 60
RSA RSA Backdoor Viability 175
RSA Ron was Wrong, Whit is Right 90
RSA Fast Primes 75
Symmetric Ciphers Logon Zero 80
Symmetric Ciphers Triple DES 60
Symmetric Ciphers Dancing Queen 120
Symmetric Ciphers Oh SNAP 120
Hash Functions MD0 80
Hash Functions Mixed Up 120
Crypto on the Web RSA or HMAC? 35
Crypto on the Web JWT Secrets 25
Crypto on the Web No Way JOSE 20
Misc LFSR Destroyer 250
Misc Jeff's LFSR 150
Misc L-Win 120
Misc Bruce Schneier's Password: Part 2 250
Misc Bruce Schneier's Password 100
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
RSA Marin's Secrets 50
RSA Infinite Descent 50
RSA Everything is Big 70
RSA Modulus Inutilis 50
RSA Salty 20
RSA Factoring 15
RSA Inferius Prime 30
RSA Monoprime 30
RSA Square Eyes 35
RSA Manyprime 40
Diffie-Hellman The Matrix Revolutions 125
Diffie-Hellman The Matrix Reloaded 100
Diffie-Hellman The Matrix 75
Crypto on the Web Token Appreciation 5
Crypto on the Web JWT Sessions 10
Elliptic Curves Background Reading 5
Diffie-Hellman Script Kiddie 70
Diffie-Hellman Additive 70
Diffie-Hellman Parameter Injection 60
Diffie-Hellman Diffie-Hellman Starter 5 40
Diffie-Hellman Diffie-Hellman Starter 4 30
Diffie-Hellman Diffie-Hellman Starter 3 20
Diffie-Hellman Diffie-Hellman Starter 2 20
Diffie-Hellman Diffie-Hellman Starter 1 10
RSA RSA Starter 6 25
RSA RSA Starter 5 20
RSA RSA Starter 4 20
RSA RSA Starter 3 20
RSA RSA Starter 2 15
RSA RSA Starter 1 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
Symmetric Ciphers Modes of Operation Starter 15
Symmetric Ciphers Round Keys 20
Symmetric Ciphers Confusion through Substitution 25
Symmetric Ciphers Diffusion through Permutation 30
Symmetric Ciphers Bringing It All Together 50
Symmetric Ciphers Structure of AES 15
Symmetric Ciphers Resisting Bruteforce 10
Symmetric Ciphers Keyed Permutations 5
Mathematics Cofactor Cofantasy 150
Mathematics Roll your Own 125
Mathematics Adrien's Signs 80
Mathematics Modular Binomials 80
Mathematics Successive Powers 60
Hash Functions Jack's Birthday Confusion 30
Hash Functions Jack's Birthday Hash 20
Mathematics Gaussian Reduction 50
Mathematics What's a Lattice? 40
Mathematics Gram Schmidt 30
Mathematics Size and Basis 15
Mathematics Vectors 10
Mathematics Chinese Remainder Theorem 40
Mathematics Modular Square Root 35
Mathematics Legendre Symbol 35
Mathematics Quadratic Residues 25
General Transparency 50
General SSH Keys 35
General CERTainly not 30
General Privacy-Enhanced Mail? 25
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 Properties 15
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 Finding Flags 2
Introduction Great Snakes 3
Mathematics Find the Lattice 100
Elliptic Curves Moving Problems 150
RSA Everything is Still Big 100
Post-Quantum Too Many Errors 100
Misc Toshi's Treasure 150
Misc Armory 100
Elliptic Curves Edwards Goes Degenerate 100
RSA Null or Never 100
RSA Bespoke Padding 100
Diffie-Hellman Export-grade 100
Diffie-Hellman Static Client 100
RSA Blinding Light 120
Symmetric Ciphers Paper Plane 120
Elliptic Curves ProSign 3 100
Elliptic Curves Curveball 100
RSA Vote for Pedro 150
RSA Crossed Wires 100
RSA Let's Decrypt Again 175
Symmetric Ciphers Forbidden Fruit 150
Hash Functions Twin Keys 100
Mathematics Broken RSA 100
Hash Functions No Difference 175
Diffie-Hellman Static Client 2 120
Hash Functions Invariant 250
Misc Trust Games 150
Mathematics Ellipse Curve Cryptography 125
Mathematics Unencryptable 125
Elliptic Curves No Random, No Bias 120
Elliptic Curves Elliptic Nodes 150
Elliptic Curves Micro Transmissions 120
Elliptic Curves Exceptional Curves 100
Misc Bit by Bit 100
Mathematics Prime and Prejudice 200
RSA Endless Emails 150
Hash Functions PriMeD5 100
Mathematics Real Eisenstein 150
Mathematics Backpack Cryptography 120
Misc Nothing Up My Sleeve 150
Misc Lo-Hi Card Game 120
Misc No Leaks 100
Misc Gotta Go Fast 40

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