MATLAB - LSB 信息隐藏工具
2018-8-24 20:29:45 【原创】
1. 运行环境
最近用到 LSB 的信息隐藏技术将数据隐藏到图片文件中，遂写了一个隐藏工具，使用 MATLAB 实现起来也很容易。
另外说一下，如果 MATLAB-2010a 版本在安装破解之后还是不能用时候，修改一下电脑的时间就好了，原理是序列号有过期时间，和本地电脑做校验。
2. 实现的功能
- 支持读取用户要隐藏的数据
- 支持将数据写入图像文件
- 支持将图像文件进行保存
- 支持提取图片中隐藏的数据，并且写入一个txt文档在当前目下
3.代码
为了方便查看，我将代码中的注释删掉了，只留了一些汉语的文字注释。
另外，还贴了一个完整版的。
在 MATLAB 如果不会用图形化开发框架的话，可以搜索一下。其实就是在 matlab 的命令行写入命令“guide”，即可调用打开图形化框架
1. 删除注释后的
function varargout = chenyun(varargin)
gui_Singleton = 1;
gui_State = struct('gui_Name', mfilename, ...
'gui_Singleton', gui_Singleton, ...
'gui_OpeningFcn', @chenyun_OpeningFcn, ...
'gui_OutputFcn', @chenyun_OutputFcn, ...
'gui_LayoutFcn', [] , ...
'gui_Callback', []);
if nargin && ischar(varargin{1})
gui_State.gui_Callback = str2func(varargin{1});
end
if nargout
[varargout{1:nargout}] = gui_mainfcn(gui_State, varargin{:});
else
gui_mainfcn(gui_State, varargin{:});
end
function chenyun_OpeningFcn(hObject, eventdata, handles, varargin)
handles.output = hObject;
guidata(hObject, handles);
function varargout = chenyun_OutputFcn(hObject, eventdata, handles)
set(handles.edit1,'enable','off');
varargout{1} = handles.output;
function pushbutton1_Callback(hObject, eventdata, handles)
[filename, pathname] = uigetfile(...
{'*.bmp;*.png','Image Files(*.bmp,*.png)';...
'*.*', 'All Files (*.*)'},...
'选择一个载体图像:');
%读入图像矩阵
global C;
global fpath;
axes(handles.axes1);
fpath=[pathname filename];
C=imread(fpath);%读取图像并存放到C中
imshow(C);
function pushbutton2_Callback(hObject, eventdata, handles)
global C;
global L;
C_M=C;
[filename, pathname] = uigetfile({'*.txt','*.mat'},'请选择待隐藏的信息文件名...');
msgpath=[pathname filename];
fileID=fopen(msgpath,'r');%打开文件
[M,L]=fread(fileID,'ubit1');
%将二进制的秘密消息M嵌入到载密图像的LSB面
[m,n]=size(C);
p=1;%嵌入计数器
for i=1:m
for j=1:n
C_M(i,j)=C(i,j)-mod(C(i,j),2)+M(p,1);%嵌入方法是先将LSB置零，然后加上秘密消息中的对应的0或1
if L==p %嵌入终止条件：当嵌入的个数为秘密消息的长度时，跳出循环，不再嵌入
break;
end
p=p+1;
end
if L==p %嵌入终止条件：当嵌入的个数为秘密消息的长度时，跳出循环，不再嵌入
break;
end
end
[filename1, pathname1] = uiputfile({'*.bmp','*.bmp'},'将隐藏图像另存为...');
imagepath=[pathname1 filename1];
fileID=fopen(imagepath,'w');%打开文件
imwrite(C_M,imagepath','bmp');
% imwrite(C_M,'pic70.bmp','bmp');
%查看嵌入信息情况：将载密图像减去载体图像
for i=1:m
for j=1:n
C_C(i,j)=C_M(i,j)-C(i,j);
end
end
%输出第二个图像
%imshow(cover);
axes(handles.axes2);
%fpath=[pathname filename];
%cover=imread(fpath);
%ste_cover=double(cover);
%imshow(cover);
imshow(C_M);
function pushbutton3_Callback(hObject, eventdata, handles)
global L;
global fpath;
[filename, pathname] = uigetfile(...
{'*.bmp;*.png','Image Files(*.bmp,*.png)';...
'*.*', 'All Files (*.*)'},...
'请选择待提取信息的隐藏图像：');
%读入图像矩阵
fpath=[pathname filename];
axes(handles.axes1);
C=imread(fpath);%读取图像并存放到C中
imshow(C);
axes(handles.axes2);
C=imread(fpath);%读取图像并存放到C中
imshow(C);
lsbsget(fpath,L);
fid = fopen('secret.txt','r');
i = 1;
while feof(fid) ==0
b(i,:) = fgetl(fid);
i = i+1;
end
set( handles.edit1,'string',b);
fclose(fid);
ra=fix(mean(double(get(handles.edit4,'string'))));
code_disp=get(handles.edit1,'String');
code=str2num(b);
text=char((code-ra)/ra);
set( handles.edit2,'string',text);
function edit1_Callback(hObject, eventdata, handles)
function edit1_CreateFcn(hObject, eventdata, handles)
function edit2_Callback(hObject, eventdata, handles)
function edit2_CreateFcn(hObject, eventdata, handles)
if ispc && isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))
set(hObject,'BackgroundColor','white');
end
function axes1_CreateFcn(hObject, eventdata, handles)
function axes2_CreateFcn(hObject, eventdata, handles)
function pushbutton_readmsg_Callback(hObject, eventdata, handles)
global code_disp;%密文
ra=fix(mean(double(get(handles.edit4,'string'))));%取整避免舍入误差
% ra为加密算子，是由用户输入且仅有用户本人知道的字符串转换而来，这里的转换算法是将字符串中的字符求
%其ASCII码的平均值，作为加密算子ra的值。
text=get(handles.edit2,'String'); %得到要转换的文本内容
code=double(text); %取得文本内容的ASCII码数组
encode=code*ra+ra;%转换成要显示的编码
code_disp=num2str(encode); %将编码转换成字符串，便于显示
set(handles.edit1,'String',code_disp)%显示转换后的结果
function pushbutton_savesecret_Callback(hObject, eventdata, handles)
global code_disp;%密文
[filename, pathname] = uiputfile(...
{'*.txt','txt files(*.txt)';...
'*.*', 'All Files (*.*)'},...
'将密文另存为...');
msgpath=[pathname filename];
fileID=fopen(msgpath,'w');
fwrite(fileID,code_disp,'char');
function edit4_Callback(hObject, eventdata, handles)
function edit4_CreateFcn(hObject, eventdata, handles)
if ispc && isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))
set(hObject,'BackgroundColor','white');
end
function S=lsbsget(C_M,L)
%读取载密图像矩阵
C_M1=imread(C_M);
[m,n]=size(C_M1);
S=zeros(1,L);
%读出LSB平面中0、1存入S中
for i=1:m
for j=1:n
if (i-1)*m+j>L%判断嵌入长度是否大于L，若大于L，则终止循环
break;
end
S(1,(i-1)*m+j)=mod(C_M1(i,j),2);
end
if (i-1)*m+j>L%判断嵌入长度是否大于L，若大于L，则终止循环
break;
end
end
%将二进制向量S转化为ASCII码并存放到文本文件secret中
fileID=fopen('secret.txt','w');
a=L/8;%计算字符个数
SC=zeros(1,a);
for i=1:a
b=0;
for j=1:8
b=b+S(1,(i-1)*8+j)*power(2,j-1);
end
SC(1,i)=b;
fwrite(fileID,SC(1,i),'char');
end
fclose(fileID);
2. 删除注释前的
function varargout = chenyun(varargin)
% CHENYUN M-file for chenyun.fig
% CHENYUN, by itself, creates a new CHENYUN or raises the existing
% singleton*.
%
% H = CHENYUN returns the handle to a new CHENYUN or the handle to
% the existing singleton*.
%
% CHENYUN('CALLBACK',hObject,eventData,handles,...) calls the local
% function named CALLBACK in CHENYUN.M with the given input arguments.
%
% CHENYUN('Property','Value',...) creates a new CHENYUN or raises the
% existing singleton*. Starting from the left, property value pairs are
% applied to the GUI before chenyun_OpeningFcn gets called. An
% unrecognized property name or invalid value makes property application
% stop. All inputs are passed to chenyun_OpeningFcn via varargin.
%
% *See GUI Options on GUIDE's Tools menu. Choose "GUI allows only one
% instance to run (singleton)".
%
% See also: GUIDE, GUIDATA, GUIHANDLES
% Edit the above text to modify the response to help chenyun
% Last Modified by GUIDE v2.5 09-May-2015 09:22:36
% Begin initialization code - DO NOT EDIT
gui_Singleton = 1;
gui_State = struct('gui_Name', mfilename, ...
'gui_Singleton', gui_Singleton, ...
'gui_OpeningFcn', @chenyun_OpeningFcn, ...
'gui_OutputFcn', @chenyun_OutputFcn, ...
'gui_LayoutFcn', [] , ...
'gui_Callback', []);
if nargin && ischar(varargin{1})
gui_State.gui_Callback = str2func(varargin{1});
end
if nargout
[varargout{1:nargout}] = gui_mainfcn(gui_State, varargin{:});
else
gui_mainfcn(gui_State, varargin{:});
end
% End initialization code - DO NOT EDIT
% --- Executes just before chenyun is made visible.
function chenyun_OpeningFcn(hObject, eventdata, handles, varargin)
% This function has no output args, see OutputFcn.
% hObject handle to figure
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
% varargin command line arguments to chenyun (see VARARGIN)
% Choose default command line output for chenyun
handles.output = hObject;
% Update handles structure
guidata(hObject, handles);
% UIWAIT makes chenyun wait for user response (see UIRESUME)
% uiwait(handles.figure1);
% --- Outputs from this function are returned to the command line.
function varargout = chenyun_OutputFcn(hObject, eventdata, handles)
% varargout cell array for returning output args (see VARARGOUT);
% hObject handle to figure
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
set(handles.edit1,'enable','off');
% Get default command line output from handles structure
varargout{1} = handles.output;
% --- Executes on button press in pushbutton1.
function pushbutton1_Callback(hObject, eventdata, handles)
% hObject handle to pushbutton1 (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
[filename, pathname] = uigetfile(...
{'*.bmp;*.png','Image Files(*.bmp,*.png)';...
'*.*', 'All Files (*.*)'},...
'选择一个载体图像:');
%读入图像矩阵
global C;
global fpath;
axes(handles.axes1);
fpath=[pathname filename];
C=imread(fpath);%读取图像并存放到C中
imshow(C);
% --- Executes on button press in pushbutton2.
function pushbutton2_Callback(hObject, eventdata, handles)
% hObject handle to pushbutton2 (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
global C;
global L;
C_M=C;
%imwrite(ste_cover,output);
[filename, pathname] = uigetfile({'*.txt','*.mat'},'请选择待隐藏的信息文件名...');
msgpath=[pathname filename];
fileID=fopen(msgpath,'r');%打开文件
[M,L]=fread(fileID,'ubit1');
%将二进制的秘密消息M嵌入到载密图像的LSB面
[m,n]=size(C);
p=1;%嵌入计数器
for i=1:m
for j=1:n
C_M(i,j)=C(i,j)-mod(C(i,j),2)+M(p,1);%嵌入方法是先将LSB置零，然后加上秘密消息中的对应的0或1
if L==p %嵌入终止条件：当嵌入的个数为秘密消息的长度时，跳出循环，不再嵌入
break;
end
p=p+1;
end
if L==p %嵌入终止条件：当嵌入的个数为秘密消息的长度时，跳出循环，不再嵌入
break;
end
end
[filename1, pathname1] = uiputfile({'*.bmp','*.bmp'},'将隐藏图像另存为...');
imagepath=[pathname1 filename1];
fileID=fopen(imagepath,'w');%打开文件
imwrite(C_M,imagepath','bmp');
% imwrite(C_M,'pic70.bmp','bmp');
%查看嵌入信息情况：将载密图像减去载体图像
for i=1:m
for j=1:n
C_C(i,j)=C_M(i,j)-C(i,j);
end
end
%输出第二个图像
%imshow(cover);
axes(handles.axes2);
%fpath=[pathname filename];
%cover=imread(fpath);
%ste_cover=double(cover);
%imshow(cover);
imshow(C_M);
% --- Executes on button press in pushbutton3.
function pushbutton3_Callback(hObject, eventdata, handles)
% hObject handle to pushbutton3 (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
global L;
global fpath;
[filename, pathname] = uigetfile(...
{'*.bmp;*.png','Image Files(*.bmp,*.png)';...
'*.*', 'All Files (*.*)'},...
'请选择待提取信息的隐藏图像：');
%读入图像矩阵
fpath=[pathname filename];
axes(handles.axes1);
C=imread(fpath);%读取图像并存放到C中
imshow(C);
axes(handles.axes2);
C=imread(fpath);%读取图像并存放到C中
imshow(C);
lsbsget(fpath,L);
fid = fopen('secret.txt','r');
i = 1;
while feof(fid) ==0
b(i,:) = fgetl(fid);
i = i+1;
end
set( handles.edit1,'string',b);
fclose(fid);
ra=fix(mean(double(get(handles.edit4,'string'))));
code_disp=get(handles.edit1,'String');
code=str2num(b);
text=char((code-ra)/ra);
set( handles.edit2,'string',text);
function edit1_Callback(hObject, eventdata, handles)
% hObject handle to edit1 (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
% Hints: get(hObject,'String') returns contents of edit1 as text
% str2double(get(hObject,'String')) returns contents of edit1 as a double
%a1 = str2double(get(handles.edit1,'String'));
% --- Executes during object creation, after setting all properties.
function edit1_CreateFcn(hObject, eventdata, handles)
% hObject handle to edit1 (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles empty - handles not created until after all CreateFcns called
% Hint: edit controls usually have a white background on Windows.
% See ISPC and COMPUTER.
%if ispc && isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))
% set(hObject,'BackgroundColor','white');
%end
function edit2_Callback(hObject, eventdata, handles)
% hObject handle to edit2 (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
% Hints: get(hObject,'String') returns contents of edit2 as text
% str2double(get(hObject,'String')) returns contents of edit2 as a double
% --- Executes during object creation, after setting all properties.
function edit2_CreateFcn(hObject, eventdata, handles)
% hObject handle to edit2 (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles empty - handles not created until after all CreateFcns called
% Hint: edit controls usually have a white background on Windows.
% See ISPC and COMPUTER.
if ispc && isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))
set(hObject,'BackgroundColor','white');
end
% --- Executes during object creation, after setting all properties.
function axes1_CreateFcn(hObject, eventdata, handles)
% hObject handle to axes1 (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles empty - handles not created until after all CreateFcns called
% Hint: place code in OpeningFcn to populate axes1
% --- Executes during object creation, after setting all properties.
function axes2_CreateFcn(hObject, eventdata, handles)
% hObject handle to axes2 (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles empty - handles not created until after all CreateFcns called
% Hint: place code in OpeningFcn to populate axes2
% --- Executes on button press in pushbutton_readmsg.
function pushbutton_readmsg_Callback(hObject, eventdata, handles)
% hObject handle to pushbutton_readmsg (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
global code_disp;%密文
ra=fix(mean(double(get(handles.edit4,'string'))));%取整避免舍入误差
% ra为加密算子，是由用户输入且仅有用户本人知道的字符串转换而来，这里的转换算法是将字符串中的字符求
%其ASCII码的平均值，作为加密算子ra的值。
text=get(handles.edit2,'String'); %得到要转换的文本内容
code=double(text); %取得文本内容的ASCII码数组
encode=code*ra+ra;%转换成要显示的编码
code_disp=num2str(encode); %将编码转换成字符串，便于显示
set(handles.edit1,'String',code_disp)%显示转换后的结果
% --- Executes on button press in pushbutton_savesecret.
function pushbutton_savesecret_Callback(hObject, eventdata, handles)
% hObject handle to pushbutton_savesecret (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
global code_disp;%密文
[filename, pathname] = uiputfile(...
{'*.txt','txt files(*.txt)';...
'*.*', 'All Files (*.*)'},...
'将密文另存为...');
msgpath=[pathname filename];
fileID=fopen(msgpath,'w');
fwrite(fileID,code_disp,'char');
function edit4_Callback(hObject, eventdata, handles)
% hObject handle to edit4 (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
% Hints: get(hObject,'String') returns contents of edit4 as text
% str2double(get(hObject,'String')) returns contents of edit4 as a double
% --- Executes during object creation, after setting all properties.
function edit4_CreateFcn(hObject, eventdata, handles)
% hObject handle to edit4 (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles empty - handles not created until after all CreateFcns called
% Hint: edit controls usually have a white background on Windows.
% See ISPC and COMPUTER.
if ispc && isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))
set(hObject,'BackgroundColor','white');
end
function S=lsbsget(C_M,L)
%读取载密图像矩阵
C_M1=imread(C_M);
[m,n]=size(C_M1);
S=zeros(1,L);
%读出LSB平面中0、1存入S中
for i=1:m
for j=1:n
if (i-1)*m+j>L%判断嵌入长度是否大于L，若大于L，则终止循环
break;
end
S(1,(i-1)*m+j)=mod(C_M1(i,j),2);
end
if (i-1)*m+j>L%判断嵌入长度是否大于L，若大于L，则终止循环
break;
end
end
%将二进制向量S转化为ASCII码并存放到文本文件secret中
fileID=fopen('secret.txt','w');
a=L/8;%计算字符个数
SC=zeros(1,a);
for i=1:a
b=0;
for j=1:8
b=b+S(1,(i-1)*8+j)*power(2,j-1);
end
SC(1,i)=b;
fwrite(fileID,SC(1,i),'char');
end
fclose(fileID);
