I need to add '0' to the end of plaintext, then I can use it within cipher to deduct it equally to 64-bit, the error in below code (append)

2 次查看（过去 30 天）

Hussain 2023-8-14

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2008237-i-need-to-add-0-to-the-end-of-plaintext-then-i-can-use-it-within-cipher-to-deduct-it-equally-to-6

回答： Walter Roberson 2023-8-19

plaintext = 'In literature, cryptosystems based on digital chaos were mostly designed for a broad range ' 
plainlen = length(plaintext);
y = mod(plainlen,8);
if y ~= 0 
    x = 8-y;
    for j=1:x
        plaintext=append(plaintext,'0');     % 
    end    
end

3 个评论
显示 1更早的评论隐藏 1更早的评论

Hussain 2023-8-19

The problem was that the in (append) It's wroks normally when I use it in Matlab ver. 2021a, but it doesn't work and give error in Matlab ver. 2013b.

but I solved it,

Thanks and appreciate your response.

Walter Roberson 2023-8-19

append came into existence at the same time as string objects came into existence, which was a few years after R2013b.

请先登录，再进行评论。

请先登录，再回答此问题。

回答（1 个）

Walter Roberson 2023-8-19

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2008237-i-need-to-add-0-to-the-end-of-plaintext-then-i-can-use-it-within-cipher-to-deduct-it-equally-to-6#answer_1289872

在 MATLAB Online 中打开

plaintext = 'In literature, cryptosystems based on digital chaos were mostly designed for a broad range ' 
plainlen = length(plaintext);
y = mod(plainlen,8);
if y ~= 0 
    plaintext = [plaintext, repmat('0', 1, 8-y)];
end