To prevent theft, diversion, and counterfeiting, freight operators and port authorities layer multiple security measures: tamper-evident seals with sensor technology, RFID tags (for automated reading), GPS tracking (real-time location), digital signatures (cryptographic document integrity), and increasingly blockchain ledgers (immutable supply chain record).
Source: https://www.rfidjournal.com/articles/23456-multi-layer-cargo-authentication-systems
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