Concise, standards-based engineering notes covering IP prefix arithmetic, cryptographic artifact verification, and safe data serialization.
Master bitwise prefix calculation, subnet masks, wildcard masks, why /31 and /127 prefixes are essential for modern point-to-point router links, and RFC 5952 canonical IPv6 representation.
Understand collision resistance, the Merkle–Damgård structure of SHA-256, verifying SHA256SUMS across operating systems, and why integrity checksums differ from cryptographic authenticity signatures.
Prevent subtle production bugs: IEEE-754 53-bit integer truncation in JSON parsers, handling multi-byte UTF-8 sequences in Base64, and choosing between Base64URL and URI percent-encoding.
