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poly
A polyalphabetic cipher is any cipher based on substitution, using multiple substitution alphabets. The Vigenère cipher is probably the best-known example of a polyalphabetic cipher, though it is a simplified special case.Polyalphabetic substitution ciphers are useful because the are less easily broken by frequency analysis, however if an attacker knows for instance that the message has a period n, then he simply can individually frequency analyze each cipher alphabet.
The number of letters encrypted before a polyalphabetic substitution cipher returns to its first cipher alphabet is called its period. The larger the period, the stronger the cipher. Of course, this method of encryption is certainly not secure by any definition and should not be applied to any real-life scenarios.
- 2015-02-27 14:52:28下载
- 积分:1
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chirp_sig
线性调频信号,包括产生和脉冲压缩,国科大资料(Chirp signal, the National Science and Technology Institute of China)
- 2013-09-28 22:07:59下载
- 积分:1
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GRAPPA_SENSE
两种算法GRAPPA和SENSE,可以通过matlab仿真。(Two algorithms GRAPPA and SENSE, matlab simulation.)
- 2013-04-05 13:39:33下载
- 积分:1
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QPSK_System_BER_Simulation
QPSK系统的误码率仿真,运用MATLAB编程(QPSK BER simulation, using MATLAB programming)
- 2010-07-15 18:37:53下载
- 积分:1
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quantisation
Quantisation at different levels.
- 2010-12-13 05:14:39下载
- 积分:1
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mseFea
multi-view spectral learning
- 2010-11-12 20:48:28下载
- 积分:1
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LorenzeSynchroPredict
利用SIMULINK建立Lorenze系统的仿真模型,并实现同步预测(Simulink for lorenze system and synchro predict)
- 2013-09-05 10:12:51下载
- 积分:1
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course
说明: 4096阶QAM调制解调 matlab仿真(matlab 4096 QAM modulation)
- 2020-09-08 23:58:06下载
- 积分:1
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coherent-optical-receiver
相干接收机博士论文 数字信号处理部分详解(PhD thesis coherent receiver digital signal processing section Comments)
- 2014-12-28 07:54:12下载
- 积分:1
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099999998
这是一个说话人识别的程序,其中有十个说话人,识别率可达到90 。执行时,执行“laststep.m”(This is a speech recognition program, including dozens of speaker recognition rate can reach 90 . Implementation, implementation " laststep.m" )
- 2010-11-07 19:44:21下载
- 积分:1