My writeups about stuff:
Earning infinite Quantum Money by (almost) cloning qubits and breaking a truncated MT19937.
Solving SIDH given extra information, by solving DLog in E[2^e].
Factoring low entropy RSA modulus bit-by-bit.
Forging post-quantum SPHINCS+ signatures when using small parameters.
Breaking flawed quantum OTP using qiskit.
Key-recovery for SIDH when the secret key is reused, against 3^n-isogenies.
Attacking ECDH with supersingular curves implementing MOV.
(Volga CTF Quals 20)
Forging plain Schnorr multisignatures using a rogue-key attack.
(Real World CTF Quals 19)
Bad instance of RSA with Gaussian integers: Euler theorem and Square and Multiply for complex numbers.
Solving Rivest Time Capsule Crypto-Puzzle when n is factorizable.
Breaking 3-round Feistel cipher (provably secure pseudorandom permutation) using a non-secure PRF.
Unmasking the commit of a ZK protocol to recover the secret, using polynomial interpolation.
(MidnightSun CTF Quals 19)
CRIME-like attack against misused GPG: side-channel to get information compressed before encryption.
(InsomniHack Teaser CTF 19)
Known-plaintext attack to code-based cryptosystem, decoding the error by exploiting its structure.
"Learning a Parallelepiped" attack on the GGH signature scheme to recover the secret key.
(CPS 2018 coursework, IST)