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Every post filed under “security”, newest first.
9 posts.
Pushkar Kumar 8 min read
The chown command in Linux explained: user:group syntax, chown -R and symlinks, --reference, chgrp, chmod vs chown, and fixing Docker volume permission errors with numeric IDs.
Pushkar Kumar 10 min read
The chmod command in Linux explained: octal and symbolic modes, chmod +x, chmod -R and its traps, setuid, setgid and sticky bits, umask, and how to fix Permission denied.
Pushkar Kumar 12 min read
Why curl, git, npm and pip print unable to get local issuer certificate, which trust store each one reads, and the fixes that add a CA instead of replacing it.
Pushkar Kumar 8 min read
The three RFC 1918 private IP ranges, why 172.16.0.0/12 catches people out, the addresses that look private but aren't, and how to pick a range that won't collide.
Pushkar Kumar 9 min read
Looking for a jwt.io alternative? What a browser-based JWT decoder can and can't prove about your data, how to check it yourself, and an offline option.
Pushkar Kumar 8 min read
Is Base64 encryption? No. What Base64 actually does, where encoded secrets leak, what really protects an API key, and when Base64 is the right tool.
Pushkar Kumar 9 min read
What the error actually means, the four causes ranked by how often they bite, and the one-line openssl check that shows whether an intermediate is missing.
Pushkar Kumar 6 min read
YAML validators catch syntax, not exposure. Five high-impact GitHub Actions misconfigurations — pull_request_target, script injection and more — with fixes.
Pushkar Kumar 5 min read
One triaged suppression, re-encoded in .trivyignore, .grype.yaml, .snyk and osv-scanner.toml — what maps cleanly between them, and what is lossy.