dr3dd@sec:~$ whoami

dr3dd

Security Engineer. Notes on security research, exploitation and CTFs.

• Mar 24, 2019 / 7 min read / Reversing

  Securinets-CTF-2019, Warmup

  Reversing the Securinets CTF 2019 "Warmup" challenge, a custom base64 routine plus per-byte checks.

• Mar 24, 2019 / 8 min read / Reversing

  Securinets-CTF-2019, Matrix of Hell

  Reversing the Securinets CTF 2019 "Matrix of Hell" crackme to recover its password and flag.

• Jan 10, 2019 / 8 min read / Cryptography

  AES-CBC bit flipping Attack

  A walkthrough of AES-CBC mode and a simple bit-flipping attack that tampers with plaintext without knowing the key.