公开(公告)号：US20070226562A1

公开(公告)日：2007-09-27

申请号：US11627229

申请日：2007-01-25

Applicant: Thomas Tkacik ,  John Spittal ,  Jonathan Lutz ,  Lawrence Case ,  Douglas Hardy ,  Mark Redman ,  Gregory Schmidt ,  Steven Tugeberg ,  Michael Fitzsimmons ,  Darrell Carder

Inventor： Thomas Tkacik ,  John Spittal ,  Jonathan Lutz ,  Lawrence Case ,  Douglas Hardy ,  Mark Redman ,  Gregory Schmidt ,  Steven Tugeberg ,  Michael Fitzsimmons ,  Darrell Carder

IPC: G01R31/28

CPC classification number: G06F21/75 ,  G01R31/31719 ,  G01R31/318516 ,  G01R31/318533 ,  G01R31/318544

Abstract: A processor, scan controller, and method for protecting sensitive information from electronic hacking is disclosed. To maintain the security of the sensitive data present in a processor, the scan controller denies access to the scan chain until data is cleared from scan-observable portions of the processor, then clears the scan chain again prior to exiting test mode and resuming normal operation. Clearing or otherwise modifying data stored in the scan-observable portions of a processor when transitioning to and/or from a test mode will prevent unauthorized personnel from simply shifting secure data out of the scan chain, and from pre-loading data into the scan chain prior to normal operation in an attempt to set sensitive state information.

Abstract translation: 公开了一种用于保护敏感信息免受电子黑客攻击的处理器，扫描控制器和方法。 为了保持处理器中存在的敏感数据的安全性，扫描控制器拒绝对扫描链的访问，直到从处理器的可扫描可见部分清除数据，然后在退出测试模式并恢复正常操作之前再次清除扫描链 。 在转换到和/或来自测试模式时，清除或以其他方式修改存储在处理器的可扫描部分中的数据将防止未经授权的人员将安全数据简单地移出扫描链，并从预加载数据到扫描链中 在正常操作之前尝试设置敏感状态信息。