密钥：密钥是一种在明文与密文之间相互转换的方式。
Key: Key is a means of converting a plain-text into cipher-text and vice versa.
以明文方式传输消息、传输加密的但以明文方式存储的消息、或者由于密钥被窃取或通过密码分析获取后对消息进行解密，在以上几种情况下都可能发生这种攻击。
This can happen to messages being transmitted in the clear, transmitted encrypted but stored in the clear, or decryption of messages due to stolen key or cryptoanalysis.
如果有完整的明文和对应的密文可是实现破译功能，即得出加密密钥。
If there is an express integrity and the corresponding ciphertext But achieving deciphering function, which is derived encryption keys.
智慧城市的整个数据生命周期过程中，可能存在以下的数据安全挑战：明文泄露、密钥破解、交易抵赖。
The entire data life cycle process of the wisdom of the city, there may be data security challenges following: clear disclosure key crack, transaction repudiation.
下面是有关明文、密文和密钥关系的表示法。
The following is a notation for relating plaintext, ciphertext, and keys.
其主要原理是在数据通信前，用DES方法对消息明文进行加密，同时用RSA方法对DES密钥进行加密和实现数字签名。
The main principle is that before data communication, encrypts the message plaintext by using DES mode and encrypts DES key by using RSA mode and realizes the digital signature.
在64位的精度下，即使初始密钥中的一个变量有10 - 15的微小差异，密码分析者也根本无法得到原始明文的任何有关信息。
At the precision of 64 bits, even if a variable in the initial key has a minute difference about 10-15, any information about the original plaintext can't be obtained.
用约瑟夫变换来扰乱明文、增大密钥空间，提高了加密的安全性。
With Joseph transformation, this thesis disrupts the plain text, increasing the key space and improving the security of encryption.
结果表明，该方法在穷举量约为241时，能恢复出输入输出变换的子密钥信息以及密文对应的明文信息。
Result shows that this method can obtain the sub-keys and the corresponding plaintexts when the computing complexity of the improving attack is about 241.
提出一种高级加密标准(aes)算法的优化方案，适合在ARM处理器上运行长度均为128位的明文和密钥。
This paper introduces an optimization of Advanced Encryption Standard (AES) with 128-bit block length and key length. It can speed up execution on ARM microprocessor.
对于密钥管理采用了实时计算密钥的技术，密钥滚动可以有效防止恶意人员对明文进行统计分析。
As for key management, it USES the technology of real time computing key to prevent hostility people analyzing proclaimed in writing.
对于密钥管理采用了实时计算密钥的技术，密钥滚动可以有效防止恶意人员对明文进行统计分析。
As for key management, it USES the technology of real time computing key to prevent hostility people analyzing proclaimed in writing.
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