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dr3dd

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

• Nov 23, 2018 / 13 min read / Binary-Exploitation

  Simple Shellcode Injection

  A pwn writeup for TUCTF-18 "shelleasy": overwrite a stack variable to 0xdeadbeef, then inject and jump to 32-bit shellcode on an executable stack.

• Oct 11, 2018 / 10 min read / Cryptography

  Simple Attack On AES-ECB Mode

  A byte-at-a-time attack that recovers a secret from an AES-ECB oracle, exploiting the fact that ECB encrypts identical blocks identically.