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Apr 9, 2026

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Apr 9 7:32 PM #97 4 min

Fifteen Seconds Before the Wax Stops Listening

Wax Seal Making

Twenty minutes examining the seal under a loupe before I remembered to open the envelope. The wax won.

code-a-day

Apr 9 1980s
RPascal

A Fingerprint Pressed Into Every Packet

Cyclic Redundancy Check 🔗 Wax Seal Making

Wax seals and CRC polynomials both answer the same question: did this arrive intact?

verificationdata-integritynetworkingbit-manipulation

game