Soreat_u’s Blog

Writeup for Crypto Problems in 2019西湖论剑决赛（复现）

2019-05-31 2024-01-29 Writeup

Writeup for 2 crypto challenges in 2019西湖论剑决赛 (2019-05-30 09:00 +9h).
- (easy) RSA: find p+q given n, e, d
- (easy) VVVV: Vigenere Cipher

Writeup for Crypto Problems in 第三届强网杯

2019-05-29 2024-01-29 Writeup

Writeup for 2 crypto challenges in qwb 2019 (2019-05-25 09:00 +36h).
- (hard) copperstudy: tackle 6 RSA challenges concerning Coppersmith method
- (easy) 强网先锋-辅助: recover p from two different n1, n2 generated by the same p

Reproduction Report: CVE-2018-2844

2019-05-28 2024-01-29 Bin

A reproduction report on CVE-2018-2844 which enables virtualbox VM to escape from guest to host.

Writeup for Babyrsa in GUETCTF 2019

2019-05-25 2024-01-29 Writeup

Writeup for Babyrsa in GUETCTF 2019 (2019-05-22 09:00 +36h).
- (easy) baby_rsa: calculate n according to given relationship of p and q

Writeup for Crypto Problems in CISCN 2019

2019-04-25 2024-01-29 Writeup

Writeup for all the crypto challenges in CISCN Pre-qualification 2019 (2019-04-20 09:00 +36h).
- (easy) puzzles: solve easy math and physics problems
- (easy) part_des: decrypt DES with round n encoding result
- (easy) warmup: exploit the repeated AES-CRT counter to find the message
- (easy) Asymmetric: crack a modified RSA encryption by extracting n