Ethereum has three trees: the state tree, the transaction tree, and the receipt tree. Why do we need three trees? Can we discard one of them? In this post, we explore the principles of the construction of the three trees.
Writeup for 3 crypto challenges in 虎符CTF 2020 (2020-04-19 09:00 +8h). - (easy) GM: recover every bit of RSA message by using legendre symbol - (medium) mceliece: break a Mceliece cryptosystem with small parameters - (easy) pell: solve specified pell equations.
In this post, we give a concise study of several attaks against DSS, including, reused $k$, $k$ generated via LCG, and lattice attack against short $k$.