Apparatus and method for protecting message data

Patent metadata

Field	Value
Publication number	US-9673983-B2
Application number	US-201313764524-A
Country	US
Kind code	B2
Filing date	Feb 11, 2013
Priority date	Sep 14, 2012
Publication date	Jun 6, 2017
Grant date	Jun 6, 2017

Abstract

Disclosed is a method for protecting message data. In the method, the message data is padded with padding bits generated based on a deterministic function performed on the message data. The padded message data is compressed to generate compressed data. A length of the compressed data is dependent on the padding bits. The compressed data is encrypted to generate encrypted message data.

First claim

What is claimed is:

1. A method for protecting message data, comprising:
padding the message data with padding bits that depend on an output generated from a hash function performed directly on the message data;
compressing the padded message data to generate compressed data, wherein an variable length of the compressed data is dependent on the padding bits; and
encrypting the compressed data to generate encrypted message data.

2. The method of claim 1 , wherein the message data is an input to the hash function, and the padding bits are an output of the hash function generated based on the message data.

3. The method of claim 1 , wherein the padding bits are prefixed to the message data.

4. The method of claim 1 , wherein the padding bits are constrained to allow an end of the padding bits to be determined by a receiver.

5. A remote station, comprising:
means for padding message data with padding bits that depend on an output generated from a hash function performed directly on the message data;
means for compressing the padded message data to generate compressed data, wherein an entire variable length of the compressed data is dependent on the padding bits; and
means for encrypting the compressed data to generate encrypted message data.

6. The remote station of claim 5 , wherein the deterministic function includes a hash function, the message data is an input to the hash function, and the padding bits are an output of the hash function generated based on the message data.

7. The remote station of claim 5 , wherein the padding bits are prefixed to the message data.

8. The remote station of claim 5 , wherein the padding bits are constrained to allow an end of the padding bits to be determined by a receiver.

9. A remote station, comprising:
a processor, implemented as hardware, configured to:
pad message data with padding bits that depend on an output generated from a hash function performed directly on the message data;
compress the padded message data to generate compressed data, wherein an entire variable length of the compressed data is dependent on the padding bits; and
encrypt the compressed data to generate encrypted message data.

10. The remote station of claim 9 , wherein the message data is an input to the hash function, and the padding bits are an output of the hash function generated based on the message data.

11. The remote station of claim 9 , wherein the padding bits are prefixed to the message data.

12. The remote station of claim 9 , wherein the padding bits are constrained to allow an end of the padding bits to be determined by a receiver.

13. A non-transitory computer-readable medium, comprising:
code for causing a computer to pad message data with padding bits that depend on an output generated from a hash function performed directly on the message data;
code for causing a computer to compress the padded message data to generate compressed data, wherein an entire variable length of the compressed data is dependent on the padding bits; and
code for causing a computer to encrypt the compressed data to generate encrypted message data.

14. The non-transitory computer-readable medium of claim 13 , wherein the message data is an input the hash function, and the padding bits are an output of the hash function generated based on the message data.

15. The non-transitory computer-readable medium of claim 13 , wherein the padding bits are prefixed to the message data.

16. The non-transitory computer-readable medium of claim 13 , wherein the padding bits are constrained to allow an end of the padding bits to be determined by a receiver.

Assignees

• Qualcomm Inc

Inventors

• Jacobson David M
• Brumley Billy B

Classifications

• H04L63/123

  received data contents, e.g. message integrity · CPC title

• H04L63/1475

  Passive attacks, e.g. eavesdropping or listening without modification of the traffic monitored · CPC title

• H04L9/3242 Primary

  involving keyed hash functions, e.g. message authentication codes [MACs], CBC-MAC or HMAC · CPC title

• H04L9/3223

  Electricity · mapped topic

• H04L63/0428

  wherein the data content is protected, e.g. by encrypting or encapsulating the payload · CPC title