Arvis

Two robots

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Solved Challenges

Mathematics Modular Binomials 80
Mathematics Successive Powers 60
Mathematics Chinese Remainder Theorem 40
Mathematics Modular Square Root 35
Mathematics Legendre Symbol 35
Mathematics Quadratic Residues 25
Symmetric Ciphers Beatboxer 150
Symmetric Ciphers Paper Plane 120
Symmetric Ciphers Oh SNAP 120
Symmetric Ciphers The Good, The Pad, The Ugly 100
Symmetric Ciphers Forbidden Fruit 150
CTF Archive ECLCG (HITCON CTF) 0
Symmetric Ciphers Pad Thai 80
CTF Archive Additional problems (CSC Belgium) 0
Symmetric Ciphers Dancing Queen 120
CTF Archive Verilicious (Cyber Apocalypse 2025) 0
Symmetric Ciphers Stream of Consciousness 80
Symmetric Ciphers CTRIME 70
Symmetric Ciphers Logon Zero 80
Symmetric Ciphers Bean Counter 60
Symmetric Ciphers Symmetry 50
CTF Archive U-turn (Breizh CTF) 0
Symmetric Ciphers Triple DES 60
Symmetric Ciphers Lazy CBC 60
Symmetric Ciphers ECB Oracle 60
CTF Archive Do you have good eyes? (Breizh CTF) 0
Symmetric Ciphers ECB CBC WTF 55
Symmetric Ciphers Flipping Cookie 60
CTF Archive Authentification 2 (Breizh CTF) 0
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
Symmetric Ciphers Structure of AES 15
Symmetric Ciphers Resisting Bruteforce 10
CTF Archive Authentification 1 (Breizh CTF) 0
Symmetric Ciphers Keyed Permutations 5
General Privacy-Enhanced Mail? 25
General Transparency 50
General SSH Keys 35
General CERTainly not 30
General Modular Arithmetic 2 20
General Lemur XOR 40
General Modular Inverting 25
General Modular Arithmetic 1 20
General Greatest Common Divisor 15
General You either know, XOR you don't 30
General Extended GCD 20
General XOR Starter 10
General Favourite byte 20
General XOR Properties 15
General Encoding Challenge 40
General Bytes and Big Integers 10
Introduction Network Attacks 5
Introduction Great Snakes 3
General Base64 10
General Hex 5
General ASCII 5
Introduction Finding Flags 2

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