本文为加沙伊斯兰大学（作者：Mahmoud A. eltatar）的硕士论文，共57页。

如何保证数据的安全性不被未经授权的用户访问是一个非常重要的问题，尤其是对于公司和终端用户来说，在传输或存储这些数据时更是如此。有多种方法可以完成这项工作；其中最著名的就是使用加密技术。密码学用于以预期接收者之外的任何人都无法理解的形式传输数据。高级标准加密算法（AES）是最安全的加密算法之一，但AES在达到满足安全级别所需的复杂度时会消耗不必要的时间，特别是对于实时应用。在本研究中，藉由修改MixColumns阶段，提出了一种改进的加密/解密方案。新方案的目的是提高加/解密过程的速度，同时保持设计的复杂性，这种方案是基于真随机数发生器的IV向量，该方案将尽可能地保持安全级别。结果表明，改进后的加解密方案比标准加密算法（AES）快两倍。改进后的加解密算法（MAES）方案复杂度高，经测试验证，其安全性达到了AES算法的安全水平。

Ensuring the security of the senetive datafrom being accessed by unauthorized user is very important issue, especiallywhile being transmitted or stored for the companies and end users. Multipleways are used to do this job; one of the most famous is to use cryptography.Cryptography is used to transfer the data in a form that is not understood byanyone apart from the intended recipient. The advance standard encryptionalgorithm (AES) is one of the most secure encryption algorithms, but AESsuffers from consumption of unnecessary time to achieve the necessarycomplexity needed to meet the security level, especially for real timeapplication. In this research, a modified scheme is developed for theencryption/decryption algorithm by modifying the MixColumns stage. The aim ofnew scheme is to increase the speed of the encryption/ decryption process whilemaintaining the complexity of the design by using IV vectors depends on truerandom number generator. Such a schem will keep the security level for theproposed scheme as complex as possible . The result verifies that the modifiedscheme of encryption and decryption (MAES) is twice faster than the advancestandard encryption algorithm (AES). The complexity of the modified scheme ofencryption and decryption algorithm (MAES) is high achive the security level asthe advance standard encryption algorithm AES algorithm as verified by tests.

1. 引言

2. 密码学理论

3. 改进的AES算法设计

4. 评估

5. 结论与展望

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