https://brynrefill.com/ In-depth and hype-free notes on cybersecurity and computer engineering, including CTF write-ups. en-US Sun, 26 Jul 2026 10:42:43 GMT https://brynrefill.com/posts/red/ https://brynrefill.com/posts/red/ Sun, 03 Aug 2025 00:00:00 GMT Writeup for RED, an easy forensics challenge from picoCTF 2025 involving LSB steganography in a PNG image. ctf writeup forensics https://brynrefill.com/posts/pietime/ https://brynrefill.com/posts/pietime/ Thu, 31 Jul 2025 00:00:00 GMT Writeup for PIE TIME, an easy pwn challenge from picoCTF 2025 involving a PIE-enabled binary. ctf writeup pwn https://brynrefill.com/posts/helloworld/ https://brynrefill.com/posts/helloworld/ Fri, 13 Jun 2025 00:00:00 GMT Kicking off this blog: what to expect here, mostly in-depth and hype-free notes on cybersecurity, computer engineering, and CTF write-ups. talks