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    • 1. 发明授权
    • Encrypting data for access by multiple users
    • 加密数据以供多个用户访问
    • US07596222B2
    • 2009-09-29
    • US11766192
    • 2007-06-21
    • Per Erwin JonasAllen Leonid RoginskyNevenko Zunic
    • Per Erwin JonasAllen Leonid RoginskyNevenko Zunic
    • H04L9/32
    • H04L9/0822H04L9/0863
    • A method for protecting data for access by a plurality of users. A server encrypts data using a master key and a symmetric encryption algorithm. For each authorized user, a key encryption key (KEK) is derived from a passphrase, and the master key is encrypted using the KEK. The server posts the encrypted data and an ancillary file that includes, for each user, a user identifier and the master key encrypted according to the user's KEK. To access the data, a user enters the passphrase into a client, which re-derives the user's KEK, and finds, in the ancillary file, the master key encrypted using the user's KEK. The client decrypts the master key and then decrypts the data. A KEK may be derived from a natural language passphrase by hashing the passphrase, concatenating the result and a predetermined text, hashing the concatenation, and truncating.
    • 一种用于保护数据以供多个用户访问的方法。 服务器使用主密钥和对称加密算法对数据进行加密。 对于每个授权用户,密钥加密密钥(KEK)是从密码短语导出的,并且使用KEK对主密钥进行加密。 服务器发布加密数据以及辅助文件,其中包括针对每个用户的根据用户的KEK加密的用户标识符和主密钥。 为了访问数据,用户将密码短语输入客户端,重新导出用户的KEK,并在辅助文件中找到使用用户的KEK加密的主密钥。 客户端解密主密钥,然后解密数据。 KEK可以从自然语言密码短语中衍生,通过散列密码,连接结果和预定文本,散列连接和截断。
    • 2. 发明授权
    • Encrypting data for access by multiple users
    • 加密数据以供多个用户访问
    • US07272231B2
    • 2007-09-18
    • US10351759
    • 2003-01-27
    • Per Erwin JonasAllen Leonid RoginskyNevenko Zunic
    • Per Erwin JonasAllen Leonid RoginskyNevenko Zunic
    • H04L9/00
    • H04L9/0822H04L9/0863
    • A method for protecting data for access by a plurality of users. A server encrypts data using a master key and a symmetric encryption algorithm. For each authorized user, a key encryption key (KEK) is derived from a passphrase, and the master key is encrypted using the KEK. The server posts the encrypted data and an ancillary file that includes, for each user, a user identifier and the master key encrypted according to the user's KEK. To access the data, a user enters the passphrase into a client, which re-derives the user's KEK, and finds, in the ancillary file, the master key encrypted using the user's KEK. The client decrypts the master key and then decrypts the data. A KEK may be derived from a natural language passphrase by hashing the passphrase, concatenating the result and a predetermined text, hashing the concatenation, and truncating.
    • 一种用于保护数据以供多个用户访问的方法。 服务器使用主密钥和对称加密算法对数据进行加密。 对于每个授权用户,密钥加密密钥(KEK)是从密码短语导出的,并且使用KEK对主密钥进行加密。 服务器发布加密数据以及辅助文件,其中包括针对每个用户的根据用户的KEK加密的用户标识符和主密钥。 为了访问数据,用户将密码短语输入客户端,重新导出用户的KEK,并在辅助文件中找到使用用户的KEK加密的主密钥。 客户端解密主密钥,然后解密数据。 KEK可以从自然语言密码短语中衍生,通过散列密码,连接结果和预定文本,散列连接和截断。