Sealing Wax Was The Original Tamper Proof Seal

Long before digital security, sealing wax acted as a physical hack to detect snooping. Melting the wax onto a letter created a brittle seal that would noticeably shatter if anyone tried to read your private mail.

This simple method was the medieval world's primary way to guarantee that a document had not been opened during transit. If the unique wax impression was broken or missing, the recipient knew immediately that the privacy of their correspondence had been compromised. While we now use digital encryption, this technique served the same core purpose for centuries. Even the ancient Romans pioneered this concept by using bitumen to protect their most sensitive communications.