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Dynamic encryption keys for use with XTS encryption systems employing reduced-round ciphers

A key and round technology, applied in the field of encryption using XTS block ciphering mode, can solve problems such as key insecurity

Inactive Publication Date: 2016-11-09
QUALCOMM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, reduced round encryption can make at least some keys less secure

Method used

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  • Dynamic encryption keys for use with XTS encryption systems employing reduced-round ciphers
  • Dynamic encryption keys for use with XTS encryption systems employing reduced-round ciphers
  • Dynamic encryption keys for use with XTS encryption systems employing reduced-round ciphers

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Embodiment Construction

[0027] In the following description, specific details are given to provide a thorough understanding of various aspects of the invention. However, it will be understood by those skilled in the art that the described aspects may be practiced without these specific details. For example, circuits may be shown in block diagrams in order to avoid obscuring aspects in unnecessary detail. In other instances, well-known circuits, structures and techniques may not have been shown in detail in order not to obscure aspects of the invention.

[0028] The word "exemplary" is used herein to mean "serving as an example, instance, or illustration." Any implementation or aspect described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other aspects of the invention. Likewise, the term "aspects" does not require that all aspects of the invention include the discussed feature, advantage or mode of operation.

[0029] overview

[0030] Several novel f...

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PUM

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Abstract

One feature pertains to encrypting data to improve data confidentiality. In one aspect, a modified form of XTS encryption is provided for use with reduced-round block ciphers. A data unit index of data to be applied to the reduced-round cipher is encrypted under a secret key to generate or otherwise obtain a modified secret key for applying to the reduced-round cipher. That is, data to be encrypted by the reduced-round cipher is not encrypted under a static key but is instead encrypted under a dynamic key that varies according to the index of the data. If an attacker were to derive the value of the key applied to the reduced-round cipher by analyzing data encrypted by the cipher, the attacker would only obtain the dynamic key corresponding to one particular data unit index, rather than a global static key applied to an entire address space. Decryption procedures are also described.

Description

[0001] Cross References to Related Applications [0002] This application claims priority and benefit to US Nonprovisional Patent Application Serial No. 14 / 205,230, filed March 11, 2014, in the US Patent and Trademark Office, which is hereby incorporated by reference in its entirety. technical field [0003] Various features relate to encryption and, in particular, to encryption utilizing XTS block cipher mode for use with mobile computing devices. Background technique [0004] Block encryption is used in cryptography to improve the confidentiality of data stored within a memory system or other storage system, in particular, a memory system that can be accessed by an attacker or other malicious entity. In general, block encryption uses a deterministic procedure or algorithm that operates on fixed-length groups of bits (ie, blocks). Block encryption may be used to implement encryption of large amounts of data, such as data stored on an off-chip memory device used with a sys...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L9/06H04L9/08H04L9/16G06F21/60G09C1/00
CPCG06F21/602G09C1/00H04L9/0637H04L9/0816H04L9/16H04L2209/12H04L2209/805H04L2209/24
Inventor B·B·布伦利V·K·代瓦西加马尼S·N·阿南德
Owner QUALCOMM INC
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