$ git -C ~/prog/stacker.news log --all --format='%B' | grep -aiE 'flag|s3Cur1tY'

$ for f in ~/Downloads/snz/*.pdf; do pdfinfo "$f" 2>/dev/null | grep -E '^(Title|Subject|Keywords)' | grep -aoE 's3Cur1tY_c7f{[A-Za-z0-9_-]+}'; done | sort -u

$ mkdir -p ~/pdfimgs && pdfimages -all ~/Downloads/snz/issue64web.pdf ~/pdfimgs/i && find ~/pdfimgs -type f -exec strings {} + | grep -aoE 's3Cur1tY_c7f{[A-Za-z0-9_-]+}' | sort -u

$ pdfdetach -list ~/Downloads/snz/issue64web.pdf

$ grep -RaoE '[A-Za-z0-9+/]{20,}={0,2}' ~ 2>/dev/null | while read x; do echo "$x" | base64 -d 2>/dev/null; done | grep -aE 's3Cur1tY_c7f{'

$ ls -laR ~/Documents/lost+found

$ grep -RohE 's3Cur1tY_c7f{[A-Za-z0-9_-]+}' ~ 2>/dev/null

$ cat .flag.txt