| 摘要 |
An encryption method and stored value system comprising a host computer, a reader/writer that communicates with the host computer, and an RF transponder that communicates with the reader/writer. The transponder comprises a transponder chip having a memory with a plurality of memory sections, which encryption method protects data stored in the memory. The method provides a secure way to increase and decrease the value stored the transponder and to selectively write and data to and from the transponder. <IMAGE>
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