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How to decrypt the cipher-text generated by RC4 stream cipher?

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Abdul Gaffar
Abdul Gaffar 2020-4-7
关闭： Walter Roberson 2020-4-7
I am encrypting 'text' message using keystream generated by RC4 stream cipher. But while decrypting the ciphertext generated by RC4 cipher, I am not getting the exact plain-text. I have attached my code.
%% \***---*** Text Encryption & Decryption using 'RC4' stream cipher ***---***/ %%
plain_text = 'MatLab R2020a';
P = double(plain_text);
S = [123, 34, 255, 76, 89, 155, 53, 0, 3, 82, 19, 45, 76]; % Keystream generated by RC4
E = bitxor(S, P); % Encryption
cipher_text = char(E); % O/p in text form
disp(cipher_text);
%% ************* For Decryption; You need keystream S and cipher_text ***********
d_cipher_text = '6C 8ùR1b!-'; % cipher_text copied from 'Workspace'
dP = double(d_cipher_text);
dE = bitxor(S, dP); % Decryption
dec_text = char(dE); % O/p in text form
disp(dec_text);
%% Conclusion: plain_text and dec_text are not same!!

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