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    • 3. 发明授权
    • Cryptographic labeling of electronically stored data
    • 电子存储数据的加密标签
    • US4864616A
    • 1989-09-05
    • US108769
    • 1987-10-15
    • Eugene W. PondJeffrey R. RushJohn D. WatsonBruce A. WoodallWalter M. GoodeGeorge E. Goode
    • Eugene W. PondJeffrey R. RushJohn D. WatsonBruce A. WoodallWalter M. GoodeGeorge E. Goode
    • G06F1/00G06F21/00
    • G06F21/64G06F21/6209G06F2221/2153
    • A method of cryptographically labeling electronically stored data is provided as part of a security system for personal computers. In protecting sensitive files of data, the labeling method utilizes a plurality of key streams, which are long, relatively prime-length sequences of random-like bytes. The key streams are related in some way to individual user and machine identifiers. Protected files of data are encrypted and decrypted by combining the key streams with the data using a reversible function, such as Exclusive OR. Each protected file has a label prefixed to it as part of the file. The label contains information necessary for encrypting and decrypting the file, controlling access to the file, and verifying integrity of the label and file. The label is permanently prefixed to the protected file but is encrypted and decrypted separately from encryption and decryption of the file.
    • 作为个人计算机的安全系统的一部分提供了一种密码地标记电子存储数据的方法。 在保护数据的敏感文件时,标签方法利用多个密钥流,这些密钥流是随机类似字节的长的,相对原始的序列。 密钥流以某种方式与个人用户和机器标识符相关。 通过使用可逆函数(如“异或”)将密钥流与数据组合在一起,对受保护的数据文件进行加密和解密。 每个受保护的文件都有一个标签作为文件的一部分。 标签包含加密和解密文件所需的信息,控制对文件的访问以及验证标签和文件的完整性。 标签永久保留在受保护文件的前缀,但是与文件的加密和解密分开加密和解密。