发明公开
EP1022684A2 Method of limiting key usage in a postage metering system that produces cryptographically secured indicium 有权
一种用于限制键的使用方法,该方法产生密码保护的邮票在盖印

  • 专利标题: Method of limiting key usage in a postage metering system that produces cryptographically secured indicium
  • 专利标题(中): 一种用于限制键的使用方法,该方法产生密码保护的邮票在盖印
  • 申请号: EP99125917.7
    申请日: 1999-12-23
  • 公开(公告)号: EP1022684A2
    公开(公告)日: 2000-07-26
  • 发明人: Ryan, Frederick W., Jr.Cordery, Robert A.
  • 申请人: PITNEY BOWES INC.
  • 申请人地址: World Headquarter, One Elmcroft Road Stamford, Connecticut 06926-0700 US
  • 专利权人: PITNEY BOWES INC.
  • 当前专利权人: PITNEY BOWES INC.
  • 当前专利权人地址: World Headquarter, One Elmcroft Road Stamford, Connecticut 06926-0700 US
  • 代理机构: HOFFMANN - EITLE
  • 优先权: US220657 19981224
  • 主分类号: G07B17/00
  • IPC分类号: G07B17/00
Method of limiting key usage in a postage metering system that produces cryptographically secured indicium
摘要:
A method for requiring that a key used in a cryptographic apparatus be changed includes the steps of: storing a constraint value for a non-time parameter of the cryptographic apparatus, the non-time parameter being related to the operation of the cryptographic apparatus; and requiring the key to be changed when an actual value of the non-time parameter is not within a range defined by the constraint value.
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