https://dimitrisper.xyz/series/picoctf/ Recent content in PicoCTF on Dimitris Pergelidis Hugo -- gohugo.io en dim.pergel@gmail.com (Dimitris Pergelidis) dim.pergel@gmail.com (Dimitris Pergelidis) © 2026 | Dimitris Pergelidis Tue, 10 Dec 2024 00:00:00 +0000 https://dimitrisper.xyz/posts/writeups/endianness-v2/ Tue, 10 Dec 2024 00:00:00 +0000 dim.pergel@gmail.com (Dimitris Pergelidis) https://dimitrisper.xyz/posts/writeups/endianness-v2/ Spotting a 4-byte-reversed JPEG header with exiftool and ghex, then swapping every 4-byte group in Python to rebuild the image and read the flag. https://dimitrisper.xyz/posts/writeups/hideme/ Mon, 09 Dec 2024 00:00:00 +0000 dim.pergel@gmail.com (Dimitris Pergelidis) https://dimitrisper.xyz/posts/writeups/hideme/ Finding a ZIP archive appended to flag.png with strings and binwalk, then carving out the secret folder that holds the picoCTF flag. https://dimitrisper.xyz/posts/writeups/blast-from-the-past/ Sat, 07 Dec 2024 00:00:00 +0000 dim.pergel@gmail.com (Dimitris Pergelidis) https://dimitrisper.xyz/posts/writeups/blast-from-the-past/ Rewriting SubSec EXIF timestamps with exiftool and patching the embedded Samsung epoch value in ImHex to hit 1970:01:01 00:00:00.001.