发明名称 |
Firmware encryption for microprocessor/microcomputer |
摘要 |
A mask value generator is used to produce a mask value for deencrypting encrypted instructions from a memory. This encryption mask generator can produce a encryption mask value from a seed value and a program counter value. The seed value can stored in a memory outside the core microprocessor. The encryption mask value can be used to deencrypt instructions in an "exclusive or" logic section.
|
申请公布号 |
US5386469(A) |
申请公布日期 |
1995.01.31 |
申请号 |
US19930102416 |
申请日期 |
1993.08.05 |
申请人 |
ZILOG, INC. |
发明人 |
YEARSLEY, GYLE;RICHARDS, GRANT |
分类号 |
G06F1/00;G06F21/00;(IPC1-7):G11B23/28;H04L9/00 |
主分类号 |
G06F1/00 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|