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    • 1. 发明授权
    • Data processor with flexible data encryption
    • 数据处理器采用灵活的数据加密
    • US5892826A
    • 1999-04-06
    • US593987
    • 1996-01-30
    • David L. BrownRaul A. PomboPaul J. Polansky
    • David L. BrownRaul A. PomboPaul J. Polansky
    • G06F12/14G06F21/00H04L9/00
    • H04L63/0428G06F12/1408G06F21/72H04L9/00G06F12/1441G06F2211/1097
    • A data processor (20) which flexibly encrypts data within different address ranges includes an encryption determination circuit (50) to monitor an address conducted on an internal address bus (22) and when the address is within certain predefined ranges, perform encryption or decryption of address and/or data. For example the encryption determination circuit (50) may be used to selectively enable a data encryption-decryption circuit (60). When the data encryption-decryption circuit (60) is disabled, data conducted on an internal data bus (23) becomes "cleartext", i.e., non-encrypted. In one embodiment, the data encryption-decryption is performed in partial dependence on the address itself, and the address conducted to the external address bus is itself selectively encrypted as well.
    • 对不同地址范围内的数据进行灵活加密的数据处理器(20)包括:加密确定电路(50),用于监视在内部地址总线(22)上传输的地址,并且当地址在某个预定范围内时,执行加密或解密 地址和/或数据。 例如,加密确定电路(50)可以用于选择性地启用数据加密 - 解密电路(60)。 当数据加密 - 解密电路(60)被禁用时,在内部数据总线(23)上传送的数据变成“明文”,即未加密。 在一个实施例中,数据加密解密部分地依赖于地址本身执行,并且传送到外部地址总线的地址本身也被选择性地加密。