Soreat_u’s Blog

[Mirror] Writeup for Redhat CTF 2019 by X1cT34m

2019-11-15 2024-01-29 Writeup

Writeup for 2019红帽杯 by X1cT34m

Read More »

Case Study: Cryptanalysis of Vigenere Ciper

2019-10-28 2024-01-29 Cryptography

Cryptanalysis of Vigenere Cipher: From theory to practice.

Read More »

How to Start to Learn Cryptography （密码学入门指北）

2019-10-08 2024-01-29 Cryptography

Why learn Cryptography, what is Cryptography, and, most importantly, how to learn Cryptography?

Read More »

How to Solve Quadratic Congruences With Prime Moduli?

2019-10-08 2024-01-29 Cryptography

Summary of two cases to extract square root modulo primes.

Read More »

Using Python to Modify Pictures Path in Markdown Files

2019-10-07 2024-01-29 Language

Download all the pictures from imgur and update the path in Markdown files by Python.

Read More »

How to Setup for Interactive Crypto Problems? (出挂载在服务端的密码题指北)

2019-09-23 2024-01-29 Cryptography

How to setup the environment of CTF crypto problems that run on the server? This post describes two methods: socat & docker

Read More »

Case Study: Pseudorandom Number Generator

2019-09-22 2024-01-29 Cryptography

A brief study of two PRNGs: LCG and MT19937

Read More »

Writeup for Many Problems in CNSS Recruit 2019

2019-09-01 2024-01-29 Writeup

Writeup for pwn, web, crypto, misc problems in CNSS Recruit 2019

Read More »

Writeup for Share in CNSS Summer Camp 2019

2019-08-25 2024-01-29 Writeup

CNSS暑假招新赛的一道Crypto题目的writeup

Read More »

Writeup for Crypto Problems in SUCTF 2019

2019-08-20 2024-01-29 Writeup

Writeup for 4 crypto challenges in SUCTF 2019 (2019-08-17 09:00 +36h).
- (easy) DSA: exploit the reused ephemeral key k to break DSA
- (easy) Prime: factor n into 4 primes
- (easy) MT: reverse a modified MT algorithm
- (easy) RSA: crack a RSA parity oracle

Read More »