Soreat_u’s Blog

Intended Solution to Crypto Problems in WMCTF 2020

2020-08-11 2024-01-29 Writeup

Intended solution to Sum, babySum, and Game in WMCTF 2020.

Crypto Research: Solving Subset Sum Problem by Lattice Reduction

2020-07-01 2024-01-29 Cryptography

Our work for “天融信杯”第五届（2020年）全国高校密码数学挑战赛

Writeup for Crypto Problems in 5spaceCTF 2020

2020-06-25 2024-01-29 Writeup

Writeup for 3 crypto challenges in “第五空间” 智能安全大赛 2020 (2020-06-24 09:00 +12h).
- (easy) rosb: RSA common modulus attack
- (medium) UnSafeAES: AES-GCM nonce reuse && forbidden attack
- (interesting) tinysocks: redirect attack on Shadowsocks stream ciphers.

Some Thoughts About the Past, the Present, and the Future —— 2020.06.07

2020-06-07 2024-01-29 Just a Transient Thought

A plain record of the first half year of 2020, some feelings about the first internship, and a dazed plan.

Upgrade SageMath to Version9 on MacOS

2020-06-05 2024-01-29 Language

Upgrade SageMath and solve several problems occurred during upgrading.

Why Ethereum Has Three Trees

2020-05-06 2024-01-29 Blockchain

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 De1CTF2020 by X1cT34m

2020-05-05 2024-01-29 Writeup

Writeup for several problems in De1CTF 2020 by X1cT34m.

Ethereum Source Code Reading

2020-04-20 2024-01-29 Blockchain

从读以太坊源码来学习区块链技术

Writeup for Crypto Problems in HufuCTF 2020

2020-04-19 2024-01-29 Writeup

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.

Blockchain Resource Collections

2020-04-15 2024-01-29 Blockchain

区块链入门资料总结