交錯區塊DES及單向函數

Abstract

在本篇論文中,我們針對DES的加密區塊大小做變化. 傳統DES每次加 密的區塊大小均為64位元.在此,我們提出兩種變化,其加密區塊分別為128 及32*q(q>=2)位元.由於加密的區塊大小增加,使得其安全性大為提高.另 外,在我們設計這個方法時,發現有些區 塊的交錯方式不存在解密方法,這 些系統可用來作為單向函數. In this paper, we make some changes to the block size of DES. The originalDES encrypts 64 bits of plaintext. Here we propose two variants. The encryption block size are 128 and 32*q (q>=2) bits, respectively. The algorithm aremore secure as the size of encryption block increases. Besides,we also find out that there does not exist decryption algorithms for some variants of the cross-block, and we turn these algorith,ms into one-wayfunctions.