Protection of security key information
    10.
    发明申请
    Protection of security key information 审中-公开
    保护安全关键信息

    公开(公告)号:US20070247182A1

    公开(公告)日:2007-10-25

    申请号:US11395871

    申请日:2006-03-31

    IPC分类号: H03K19/00

    摘要: A protection circuit is disclosed, for preventing access to stored security key data after the security key is no longer used. The protection circuit performs operations on a programming circuit used to program a bit of the security key. The protection circuit prevents inspection of the security key bit, using several techniques. Subsequent inspection of the programming circuit does not reveal the value of the security key bit.

    摘要翻译: 公开了一种用于在不再使用安全密钥之后防止对存储的安全密钥数据的访问的保护电路。 保护电路对用于编程安全密钥位的编程电路进行操作。 保护电路使用几种技术来防止对安全密钥位的检查。 对编程电路的后续检查不会显示安全密钥位的值。