Write-once-read-once batteryless authentication token
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United States of America Patent
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-
Jul 16, 1991
Grant Date -
N/A
app pub date -
Aug 10, 1989
filing date -
Aug 10, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A write-once-read-once batteryless token stores access data using fuses similar to those found in programmable fuse link devices. These fuses indicate the status of a particular bit in either of two memory arrays. An intact fuse indicates that a bit is a logical zero, and a blown fuse indicates that a bit is a logical one. The process of reading a particular bit in either array causes the destruction of the corresponding memory cells in both arrays before the data from the selected cell becomes available to the reading device. The memory bit cells are destroyed by blowing the bit fuse during the read cycle.
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