公开(公告)号：US5586186A

公开(公告)日：1996-12-17

申请号：US275500

申请日：1994-07-15

申请人： Gideon A. Yuval ,  Michael Ernst

发明人： Gideon A. Yuval ,  Michael Ernst

IPC分类号： G06F1/00 ,  G06F21/00 ,  H04L9/30

CPC分类号： G06F21/10 ,  H04L9/302 ,  G06F2211/007 ,  G06F2221/2107 ,  H04L2209/08 ,  H04L2209/34 ,  H04L2209/56

摘要： A system for controlling unauthorized access to information distributed to users and, more particularly, for controlling unauthorized access to software distributed to users is provided. One method utilizing the system of the present invention enables the software to be encrypted using a single encryption key and to be decrypted using a multiplicity of "decryption" keys, each of which is unique to a particular user. The "decryption" keys are the products of numeric representations of identifying information relating to users and unique user keys generated using the numeric representations and a "true" decryption key. Since each user receives a unique user key and both the numeric representation and the user key are generated using the identifying information, if the user reveals the numeric representation and the user key (or the product of the numeric representation and the user key), the numeric representation and the user key can be traced to the user who revealed them. Another method utilizing the system of the present invention introduces randomness or pseudo-randomness into the decryption scheme to provide an additional level of security to the scheme.

摘要翻译： 提供了一种用于控制未经授权地访问分发给用户的信息的系统，更具体地，用于控制未经授权的访问分发给用户的软件。 利用本发明的系统的一种方法使得能够使用单个加密密钥对软件进行加密，并且使用多个“特定用户”唯一的“解密”密钥进行解密。 “解密”密钥是与用户相关的识别信息和使用数字表示生成的唯一用户密钥和“真实”解密密钥的数字表示的产物。 由于每个用户接收到唯一的用户密钥，并且使用识别信息生成数字表示和用户密钥，所以如果用户显示数字表示和用户密钥（或数字表示和用户密钥的乘积），则 数字表示和用户密钥可以追溯到显示他们的用户。 利用本发明的系统的另一种方法将随机性或伪随机性引入到解密方案中，以为该方案提供额外的安全级别。