Rotation Hygiene

Key rotation literacy — overlap windows, re-encryption, cert/key sync — defender operational hygiene on $CRYPTO_LAB policy docs.

Rotation Hygiene• Audio Walkthrough

00:00/03:03

Visual · t28_rotation_hygiene

Rotation = named operational hygiene. $CRYPTO_LAB. Original Cyberlium.

Static keys rot slowly until breach — name rotation overlap and re-encryption hygiene before any incident forces panic.

Key rotation hygiene: schedule (90-day API keys, annual TLS cert renewal tie-in Module 6), overlap window (old + new key both valid briefly), re-encryption of data at rest with new DEK, automated rotation via KMS, emergency revoke procedure, audit log of rotation events. Defenders document who rotates, how apps pick up new material, and break-glass revoke. Cyberlium on $CRYPTO_LAB policy template — NOT disabling rotation on prod to 'avoid downtime,' NOT sharing rotation secrets in chat, NOT attacking prod during overlap window. Lab row: rotation checklist (generate, deploy, overlap, revoke old, audit) with UTC milestone stub.

1. Rotation checklist

Generate new → deploy to consumers → overlap window → revoke old → audit log — five steps.

Cert renewal and key rotation linked — Module 6 lifecycle alignment.

Command guide

Try these commands — Rotation checklist

═══ TOOLS & WEBSITES ═══ Browse / read these (authorized learning only — stay in YOUR lab / program scope)

NIST SP 800-57 — https://csrc.nist.gov/publications/detail/sp/800-57-part-1/rev-5/final

Optional command

OpenSSL enc — https://www.openssl.org/docs/manmaster/man1/openssl-enc.html

CWE-326 — https://cwe.mitre.org/data/definitions/326.html

═══ INSTALL ═══

Linux (Debian/Ubuntu): Built-in (vim-common / xxd)

macOS: Built-in

Windows: Use WSL or Git Bash xxd

═══ LINUX / macOS ═══

Command — copy this

export CRYPTO_LAB=${CRYPTO_LAB:-$HOME/cyberlium-lab/t28-crypto}
KEY=$(cat "$CRYPTO_LAB/keys/lab-random-32.hex")
echo "Lab key fingerprint (SHA-256 of hex file):"
sha256sum "$CRYPTO_LAB/keys/lab-random-32.hex"
xxd -r -p "$CRYPTO_LAB/keys/lab-random-32.hex" | wc -c
grep -E 'rotate|never' "$CRYPTO_LAB/notes/key-storage-literacy.txt"

Primary tools to practice this lesson: sha256sum, xxd. Reference sites: NIST SP 800-57 (https://csrc.nist.gov/publications/detail/sp/800-57-part-1/rev-5/final); OpenSSL enc (https://www.openssl.org/docs/manmaster/man1/openssl-enc.html); CWE-326 (https://cwe.mitre.org/data/definitions/326.html). Run every command in the box — install first, then the usage lines — only on YOUR lab / program scope.

2. Operational risks

Missed rotation → expiry outage; no overlap → broken clients; stale revoked key still in cache.

Document honest N/A if brief skips live rotation demo.

3. Refused

No prod key harvest during overlap; no skipping audit to hide mistakes.

Rotation literacy supports ops — not unauthorized access.

4. What you ship: rotation hygiene checklist

Five rotation steps + overlap note + audit row + scope line.

5. What you record before the next lesson

Rotation hygiene checklist path.

6. Wrong vs right: prod crypto oracles vs CTF toys

Worked failure — same MSF word, opposite target. Right never needs a café Wi-Fi or classmate laptop.

Wrong: Disable API key rotation on employer prod 'to simplify lab notes.'
Right: Rotation hygiene checklist from $CRYPTO_LAB policy template. Next: Keys Lab.

Hands-on Exercise