发明授权
US5878136A Encryption key control system for mail processing system having data center verification 失效
具有数据中心验证功能的邮件处理系统加密密钥控制系统

Encryption key control system for mail processing system having data
center verification
摘要:
A key control system comprises the generation of a first set of keys which are then used for a plurality of respective postage meters. The keys are then related to a respective meter in accordance with a map or algorithm. The keys may be changed by entering the second key via an encryption using the first key.
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