| 摘要 |
<p>The present invention is a weight verification device (WVD) that stamps a weight transaction record with a digital signature so that transaction data may be verified at a later time. The WVD is an application specific integrated circuit (ASIC) device that is installed in a sealed digital weight indicator. When a vehicle is weighed using this digital weight indicator (12), a weight transaction record is stamped with a digital signature and stored in a computer. The WVD may be used to confirm that the inbound and outbound weights and the date and time are accurate, that the transaction as a whole has not been modified in any way since the time the transaction record was created. The digital signature stored with the transaction data is based on a secure hash of the transaction data and a private key belonging to an inspector from the Weights and Measures Department or a designated representative. The private key is entered (18) into the WVD as an encrypted message that the WVD decrypts before using it to sign transactions. The private key is erased automatically whenever the digital weight indicator's seal (20) is breached.</p> |
