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Generalized Format-preserving Encryption for Character Data
Ma Haoyu #,Liu Zheli,Jia Chunfu *,Yuan Ke
College of Information Technical Science, NanKai University, TianJin 300071
*Correspondence author
#Submitted by
Subject:
Funding: The Specialized Research Fund for the Doctoral Program of Higher Education of China （No.20100031110030）, The National Key Basic Research Program of China （No.2013CB834204）, The National Natural Science Foundation of China（No.60973141,61272423）
Opened online:10 May 2013
Accepted by: none
Citation: Ma Haoyu,Liu Zheli,Jia Chunfu.Generalized Format-preserving Encryption for Character Data[OL]. [10 May 2013] http://en.paper.edu.cn/en_releasepaper/content/4540303
 
 
We studied format-preserving encryption (FPE) for character data, for solutions that encipher character strings while preserving both their lengths and memory consumptions. By clustering characters into multiple sets according to the number of bytes they are encoded, we managed to establish mixed-radix numeral systems for character data. Under such systems, we proposed a basic method for character data that exploits existing FPEs, as well as a generalized character FPE scheme using Feistel-based construction, where a customized ``dynamic modular addition'' is used to ensure the feasibility the scheme. Our work showed a new way of designing encryption methods for arbitrary message spaces, which involves no tradeoff between efficacy and efficiency.
Keywords:Computer security; block ciphers; format-preserving encryption; feistel networks; mixed-radix numeral systems
 
 
 

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