Abstract: A differentially private security system communicatively coupled to a database storing restricted data receives a database query from a client. The database query includes a relation specifying a set of data in the database upon which to perform the query and privacy parameters associated with the query. The differentially private security system determines a worst-case privacy spend for the query based on the privacy parameters and the relation. The differentially private security system performs the query upon the set of data specified by the relation and decrements the determined worst-case privacy spend from a privacy budget associated with the client. The differentially private security system records the worst-case privacy spend and the query at a log and determines a privacy budget refund based on queries recorded in the log. The differentially private security system applies the determined privacy budget refund to the privacy budget associated with the client.

Abstract: A differentially private security system communicatively coupled to a database storing restricted data receives a database query from a client. The database query includes a relation specifying a set of data in the database upon which to perform the query and privacy parameters associated with the query. The differentially private security system determines a worst-case privacy spend for the query based on the privacy parameters and the relation. The differentially private security system performs the query upon the set of data specified by the relation and decrements the determined worst-case privacy spend from a privacy budget associated with the client. The differentially private security system records the worst-case privacy spend and the query at a log and determines a privacy budget refund based on queries recorded in the log. The differentially private security system applies the determined privacy budget refund to the privacy budget associated with the client.

Abstract: A differentially private security system communicatively coupled to a database storing restricted data receives a database query from a client. The database query includes a relation specifying a set of data in the database upon which to perform the query and privacy parameters associated with the query. The differentially private security system determines a worst-case privacy spend for the query based on the privacy parameters and the relation. The differentially private security system performs the query upon the set of data specified by the relation and decrements the determined worst-case privacy spend from a privacy budget associated with the client. The differentially private security system records the worst-case privacy spend and the query at a log and determines a privacy budget refund based on queries recorded in the log. The differentially private security system applies the determined privacy budget refund to the privacy budget associated with the client.

Abstract: A differentially private system receives a request from a client to perform a query on data stored in a database. The differentially private system establishes a set of permissions of the client with respect to the data in the database. The differentially private system deconstructs the query into query components. The query components include at least one relation that identifies a dataset in the database and at least one expressions specifying an operation to be performed in the identified dataset. The differentially private system identifies permissions necessary to perform the specified operation on the identified dataset. The differentially private system determines whether the established permissions grants of the client include the identified permissions necessary to perform the specified operation on the identified dataset. The differentially private system selectively executes the query responsive to the determination.

Abstract: A differentially private security system communicatively coupled to a database storing restricted data receives a database query from a client. The database query includes a relation specifying a set of data in the database upon which to perform the query and privacy parameters associated with the query. The differentially private security system determines a worst-case privacy spend for the query based on the privacy parameters and the relation. The differentially private security system performs the query upon the set of data specified by the relation and decrements the determined worst-case privacy spend from a privacy budget associated with the client. The differentially private security system records the worst-case privacy spend and the query at a log and determines a privacy budget refund based on queries recorded in the log. The differentially private security system applies the determined privacy budget refund to the privacy budget associated with the client.

Abstract: A differentially private system receives a request from a client to perform a query on data stored in a database. The differentially private system establishes a set of permissions of the client with respect to the data in the database. The differentially private system deconstructs the query into query components. The query components include at least one relation that identifies a dataset in the database and at least one expressions specifying an operation to be performed in the identified dataset. The differentially private system identifies permissions necessary to perform the specified operation on the identified dataset. The differentially private system determines whether the established permissions grants of the client include the identified permissions necessary to perform the specified operation on the identified dataset. The differentially private system selectively executes the query responsive to the determination.

Abstract: A differentially private system receives a request from a client to perform a query on data stored in a database. The differentially private system establishes a set of permissions of the client with respect to the data in the database. The differentially private system deconstructs the query into query components. The query components include at least one relation that identifies a dataset in the database and at least one expressions specifying an operation to be performed in the identified dataset. The differentially private system identifies permissions necessary to perform the specified operation on the identified dataset. The differentially private system determines whether the established permissions grants of the client include the identified permissions necessary to perform the specified operation on the identified dataset. The differentially private system selectively executes the query responsive to the determination.

Abstract: A system for reducing fraudulent use of a mobile telephone number in a radio telecommunications network. The system automatically bars call originations from the mobile telephone if the mobile telephone does not register with the network for a predetermined time period, or if the mobile telephone does not originate a call for a second predetermined time period. The system determines when a mobile telephone originates a call, measures a predetermined time period with a timing mechanism, and starts the timing mechanism when the mobile telephone originates a first call. The system then determines whether a second call originated from the mobile telephone during the predetermined time period and restarts the timing mechanism at the time that the mobile telephone originates a second call upon determining that the second call originated from the mobile telephone during the predetermined time period.