RSA代码在matlab中 [英] RSA code in matlab

问题描述

我想加密一个消息，如'HELO1234 ，然后解密以获得原始的。我在matlab中编写了无法正常工作的RSA代码。

I want to encrypt a message such as 'HELO1234 and then decrypt to get the original one.I have written RSA code in matlab which is not working correctly.

PARAMETER CALCULATION

PARAMETER CALCULATION

temp=1;
range=1:10;
k=isprime(range)
prime_mat=range(find(k))
p=randsample(prime_mat,1);
q=randsample(prime_mat,1);
if(p~=q)
n=p*q;
phi_n=(p-1)*(q-1);
u=1:phi_n -1;
end
while temp
 enckey=randsample(u,1);
  deckey=randsample(u,1);
  if(enckey~=deckey)
  if(gcd(enckey,phi_n)~=1 ...
     && gcd(deckey,phi_n)~=1 ...
   &&gcd(enckey*deckey,phi_n)~=1)
    temp=1;
 else 
 temp=0;
  end
  end
end

ENCRYPTION PROCESS

ENCRYPTION PROCESS

 char t= 'hello123';
      t=uint8(t);
        len=length(t)
         pow=[];
         cipher_text=[];
           for i=1:len                                   
               pow=[pow;t(i).^(enckey)];  %each element of the pt matrix(plain text) is raised    to the power of encryption key(enc_key) and stored in pow matrix(power matrix)

    cipher_text=[cipher_text;mod(pow(i),n)];% cipher text is calculate

d

加密过程的输出

OUTPUT OF encryption process

k =

 0     1     1     0     1     0     1     0     0     0

prime_mat =

prime_mat =

 2     3     5     7

p =

 7

q =

 2

n =

14

enckey =

 5

deckey =

 1

phi_n =

 6

len =

28

cipher_text =

cipher_text =

3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3

DECRYPTION PROCESS

DECRYPTION PROCESS

plain_text=[];
pow1=[];
len1=length(cipher_text);
for i=1:len
    pow1=[pow1;cipher_text(i).^(deckey)]
    plain_text=[plain_text;mod(pow1(i),n)]

uint8（plain_text）;

uint8(plain_text);

推荐答案

不要打扰自己实现。写密码很难，bug有安全性后果。使用来自值得信赖的供应商的知名库。

Don't bother implementing it yourself. Writing crypto is hard and bugs have security consequences. Use a well-known library from a trusted vendor.

在Matlab中，您可以调用与Matlab绑定的JVM附带的标准Java加密类。 Matlab代码看起来像这样。

In Matlab, you can call down to the standard Java cryptography classes included with the JVM bundled with Matlab. The Matlab code will look something like this.

import javax.crypto.Cipher;

plaintext = 'foobar';

cipher = Cipher.getInstance('RSA');
keygen = java.security.KeyPairGenerator.getInstance('RSA');
keyPair = keygen.genKeyPair();
cipher.init(Cipher.ENCRYPT_MODE, keyPair.getPrivate());

plaintextUnicodeVals = uint16(plaintext);
plaintextBytes = typecast(plaintextUnicodeVals, 'int8');
ciphertext = cipher.doFinal(plaintextBytes)'  %'

% And back out
cipher.init(Cipher.DECRYPT_MODE, keyPair.getPublic());
decryptedBytes = cipher.doFinal(ciphertext);
decryptedText = char(typecast(decryptedBytes, 'uint16'))'

这篇关于RSA代码在matlab中的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！