Efficient Format-Preserving Encryption Mode for Integer
Shuang Liang, Yanan Zhang, Jiansheng Guo, Changqing Dong, Zheli Liu, Chunfu Jia · 2017
To protect the confidentiality of information system, encryption techniques are essential and widely used. However, the encryption with a traditional block cipher may cause a damage to the application or database due to the format changing. Format-preserving encryption (FPE) plays an important role in practice, especially for the integer. We studied the problems on applying FPE for integer, specifically the low performance caused by cycle-walking. In this paper, we suggest a construction for integer which is based on the unbalanced Feistel network. It improves the performance by reducing the probability of cycle-walking. Besides, we analyze the security and performance. The result shows that it's practical and secure.