Hack The Box Challenges (Crypto)
Personal writeups from Hack The Box challenges with nice explanations, techniques and scripts
<- HTB CHALLENGESCrypto - Total:
86
CTFECDSA. Partially-known nonces. LLL lattice reduction CTFJWT. ECDSA. Python random state CTFJWT. ECDSA. Java psychic signatures CTFE2E encryption. Diffie-Hellman. AES CTFModular arithmetic. RSA signature. Malleability CTFSolution to a non-linear system of equations CTFMultiprime RSA. Find private key CTFMD5 hash collision with constraints CTFQuantum Cryptography. Frame-based Quantum Key Distribution CTFHash function. XOR. Oracle CTFHash length extension attack. Custom hash function CTFAES. Shamir Secret Sharing CTFInteger linear relations. LLL lattice reduction. ECDLP. CRT CTFBLS12-381. BLS signatures. Rogue key attack. Zero-knowledge proof. EC-LCG. LLL lattice reduction CTFLearning With Errors. Probabilistic oracle CTFClose primes. RSA and ECC. Finding curve parameters. Elliptic curve over composite modulus CTFECDSA. Nonces with known bits. Hidden Number Problem. LLL lattice reduction CTFMerkle Tree. Second preimage attack CTFQuadratic residues. Legendre Symbol CTFTEA. Equivalent keys. CBC mode CTFECC. Finding curve parameters. Modular arithmetic. ECDLP CTFRSA. Partially-known private information. Modular arithmetic CTFTEA. Reverse encryption function CTFRSA. Modular square root. Smooth primes. Discrete logarithm CTFDSA. Modular arithmetic. LLL lattice reduction CTFRSA. GCD. Coppersmith method. Euler’s Theorem CTFFractions. Diophantine equation solution with elliptic curve. RSA signature. LLL lattice reduction. Groebner basis CTFRSA-CRT. Modular arithmetic. Coppersmith method CTFMignotte Secret Sharing. Modular arithmetic. Chinese Remainder Theorem CTFAES CTR. Stream cipher. XOR CTFAES CBC. Bit Flipping Attack. XOR CTFRecurrence relation. Telescoping series. LCG CTFPRNG. Custom Mersenne Twister. System of equations with binary variables CTFAES cipher. Frequency analysis. Depth-first search CTFAES cipher. Frequency analysis CTFHexadecimal and Base64 encodings CTFPadding Oracle Attack. Custom cipher and padding CTFDES. Padding Oracle Attack CTFHomomorphic encryption. XOR cipher. AES cipher. Brute force CTFDSA. Nonce reuse. Modular arithmetic CTFRelated messages attack. Modular arithmetic CTFECC. Binary search. Finding curve parameters. Smart’s attack. PRNG CTFSchnorr signature. Hidden Number Problem. LLL lattice reduction CTFECC. Finding curve parameters. Coppersmith method on a bivariate polynomial CTFSchnorr signature. MD5 collision CTFMatrix operations. Chinese Remainder Theorem CTFAES cipher. XOR properties CTFRSA. Common modulus attack CTFBinary operations. Simplify and reverse encryption algorithm CTFElliptic Curve Cryptography. Invalid Curve Attack CTFRSA. Euler’s totient function. AES decryption CTFPCAP analysis. XOR cipher CTFRSA. Greatest Common Divisor CTFTruncated LCG. AES. Knapsack. LLL lattice reduction CTFDNA encoding. Substitution cipher. Frequency analysis CTFTraffic analysis. ElGamal. Modular arithmetic CTFKnapsack. Brute force. Modular arithmetic. Shuffling. LLL lattice reduction CTFCustom encryption using AES and XOR CTFRSA. Known bits. Coppersmith method. LLL lattice reduction CTFCustom hash function. Bit operations CTFAES cipher modes. Stream cipher. Known plaintext attack CTFRSA. Greatest Common Divisor CTFMiller-Rabin primality test CTFAES CTR. Inverse function of the Python built-in hash function CTFRSA. Forge signature. Regular Expression bypass CTFBrainfuck. RSA with CRT CTFShamir Secret Sharing. PRNG seed CTFRSA. Close primes. PRNG CTFFranklin-Reiter related-message attack CTFBlock cipher. Known plaintext attack. Induction. SHA256 CTFGreatest Common Divisor. Modular arithmetic. PKCS7 padding CTFReverse encryption algorithm