Method and apparatus for storing information in a browser storage area of a client device

1. A system, comprising:

a set of one or more interfaces configured to receive, from a client device, a request for content;

a set of one or more processors configured to:

determine, during a first network session, a first set of network resource requests for data that encode information usable to identify the client device; and

cause the client device to initiate the first set of network resource requests for data, wherein data associated with at least some of the first set of network resource requests for data is stored at the client device;

wherein, during a second network session, a server is configured to transmit a sequence of messages to the client device , wherein the sequence of messages causes the client device to initiate a second set of network resource requests for data, and wherein the server is configured to identify the client device at least in part by determining, from the second set of network resource requests for data caused to be initiated by the sequence of messages, whether the client device requests a network resource in the one or more network resources or retrieves a local copy of the network resource, and wherein data associated with at least some of the second set of network resource requests for data is withheld from the client device; and

a memory coupled to the set of one or more processors and configured to provide the set of one or more processors with instructions.

2. The system of claim 1 wherein at least some of the first set of network resource requests for data are expressed as Uniform Resource Locators (URLs).

3. The system of claim 1 wherein at least some of the first set of network resource requests for data are associated with Temporary Internet Files.

4. The system of claim 1 wherein the one or more network data associated with the first set of network resource requests for data are stored in a storage associated with a browser of the client device.

5. The system of claim 1 wherein the one or more network resources associated with the first set of network resource requests for data stored at the client device includes one or more elements associated with a graph structure.

6. The system of claim 5 wherein the set of one or more processors is further configured to cause at least one element associated with the graph structure to encode representations of subsets of users.

7. The system of claim 5 wherein the one or more network resources associated with the first set of network resource requests for data comprise includes nodes associated with a tree structure.

8. The system of claim 7 wherein the set of one or more processors is further configured to traverse the tree structure.

9. The system of claim 7 wherein resource identifiers are stored at secret addresses.

10. The system of claim 9 wherein determining the first set of network resources requests for data that encode information usable to identify the client device further comprises determining a first portion of the encoded information if a first secret address in the secret addresses is known.

11. A system, comprising:

a set of one or more interfaces configured to transmit, during a network session, a sequence of messages, wherein the sequence of messages causes the client device to initiate a set of network resources requests for data, and wherein, during a previous network session, one or more network resources were caused to be stored at the client device;

a set of one or more processors configured to:

identify the client device based at least in part by determining, from the set of network resource requests for data caused to be initiated by the sequence of messages, whether the client device requests a network resource in the one or more network resources or retrieves a local copy of the network resource; and

withhold data associated with at least some of the set of network resource requests or data from the client device; and

a memory coupled to the set of one or more processors and configured to provide the set of one or more processors with instructions.

12. The system of claim 11 wherein the client device is configured to reveal a first portion of an identity of the client device, wherein the identity comprises the first portion and a second portion.

13. The system of claim 12 wherein the set of one or more processors is configured to cause the client device to initiate the set of network resource requests to reveal the second portion of the identity of the client device..

14. A method, comprising:

transmitting, during a network session and via a set of one or more interfaces, a sequence of messages, wherein the sequence of messages causes a client device to initiate a set of network resource requests for data, and wherein, during a previous network session, one or more network resources were caused to be stored at the client device;

identifying, using a set of one or more processors, the client device at least in part by determining, from the set of network resource requests for data caused to be initiated by the sequence of messages, whether the client device requested a network resource in the one or more network resources or retreived a local copy of the network resource; and

withholding data associated with at least some of the set of network resource requests for data from the client device.