发明名称 |
Data encryption control system |
摘要 |
The data encryption system includes a first stage and a second stage data encryption engine in combination with a micro control system. The data encryption system is responsive to control signals from the micro control system. The first stage is comprised of an 8-bit bus input and output from the first stage to the second stage data encryption engine of 64-bits. The input bus of the first stage is gated to a plurality of 8-bit registers through a plurality of AND gates having a respective one of the AND gate inputs in communication with the 8-bit bus and output from the respective AND gate directed to a respective input of the respective 8-bit registers for selectively gating data from the 8-bit bus to respective ones of the 8-bit registers. A demultiplexer includes a plurality of inputs and a plurality of outputs, a respective output of the demultiplexer being in communication with the input of a respective one of the AND gates for selectively enabling a respective one of the AND gate in response to the state of the control signals.
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申请公布号 |
US5652796(A) |
申请公布日期 |
1997.07.29 |
申请号 |
US19940264082 |
申请日期 |
1994.06.21 |
申请人 |
PITNEY BOWES INC. |
发明人 |
BARRAZA, THOMAS F.;LEE, YOUNG W.;MOH, SUNGWON;MULLER, ARNO |
分类号 |
H04L9/06;(IPC1-7):H04L9/06;H04L9/00 |
主分类号 |
H04L9/06 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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