Method and apparatus for encoding and storing session data

• US 7,010,605 B1
• Filed: 08/29/2000
• Issued: 03/07/2006
• Est. Priority Date: 08/29/2000
• Status: Expired due to Fees

• Current Assignee: Microsoft Technology Licensing LLC (Microsoft Corporation)
• Original Assignee: Microsoft Corporation
• Inventors: Dharmarajan, Baskaran
• Primary Examiner(s): Sheikh, Ayaz
• Assistant Examiner(s): HOFFMAN, BRANDON S
• Application Number:
  US09/650,104
• Time in Patent Office: 2,016 Days
• Field of Search: 713/162, 345/745, 709/227
• US Class Current: 709/227
• CPC Class Codes: H04L 63/0428 wherein the data content is protected, e.g. by encrypting or encapsulating the payload
• CPC Class Codes: H04L 9/0822 using key encryption key

Abstract

Session data is encoded in a tag-length-value format and encrypted using a modified encryption key. A session cookie is then formed by concatenating the length of the length of the secret, the length of the secret, the secret itself, and the encoded and encrypted configuration data. The session cookie is transmitted from a server computer to a client computer, where it is stored.

Claims

1. A method for storing session data on a client computer, comprising:

encoding said session data in a tag-length-value format to create encoded configuration data, said encoded configuration data including a time stamp;

encrypting said encoded configuration data using a modified encryption key to create encrypted encoded configuration data;

concatenating a secret, a value that represents the length of the secret, and a value that represents the length of the length of the secret with said encrypted encoded configuration data to form a session cookie;

transmitting said session cookie to said client computer;

requesting said session cookie from said client computer;

receiving said session cookie from said client computer;

extracting said secret from said session cookie;

creating said modified encryption key by inserting said secret extracted from said session cookie into a standard encryption key at a predefined location; and

decrypting said session data from said cookie using said modified encryption key.

2. The method of claim 1, wherein said modified encryption key comprises a standard encryption key with said secret inserted at a predefined location.

3. The method of claim 2, further comprising:

decoding a tag from said session data;

determining whether said tag comprises a valid tag; and

in response to determining that said tag comprises a valid tag, configuring said server using data contained in said tag.

4. The method of claim 3, further comprising:

in response to determining that said tag does not comprise a valid tag, determining whether additional tags remain to be decoded from said encoded configuration data; and

in response to determining that additional tags remain to be decoded, decoding a next tag and determining whether said next tag comprises a valid tag.

5. The method of claim 4, further comprising:

in response to determining that said next tag comprises a valid tag, configuring said server using data contained in said next tag.

6. The method of claim 5, further comprising:

in response to determining that additional tags do not remain to be decoded, periodically authenticating said session cookie.

7. The method of claim 6, wherein periodically authenticating said session cookie comprises:

starting a session timer;

determining whether said session timer has elapsed; and

in response to determining that said session timer has elapsed,

(i) requesting said session cookie from said client computer,

(ii) decrypting and decoding a tag contained in said session cookie, and

(iii) determining whether said tag comprises a valid tag.

8. The method of claim 7, further comprising:

in response to determining that said tag comprises a valid tag,

(i) generating a new session cookie,

(ii) transmitting said new session cookie to said client computer, and

(iii) resetting said session timer.

9. The method of claim 7, further comprising:

in response to determining that said tag does not comprises a valid tag, ending a communications session between said server computer and said client computer.

10. A computer-readable medium containing computer-readable instructions which, when executed by a computer, perform the method of claim 1.

11. A computer-readable medium containing computer-readable instructions which, when executed by a computer, perform the method of claim 2.

12. A computer-controlled apparatus for performing the method of claim 1.

13. A computer-controlled apparatus for performing the method of claim 2.