Is it possible to convert an ECG/EEG signal to numerical data form?

I have to encrypt some data. Which includes patient details, pressure , temperature etc and also ECG/EEG signal. I am using RSA method for the encryption. I have the code to send all data as message (patient details & other numerical entries). But how can I encrypt ECG signal. Is there any method to convert signal to numerical data, so that I can encrypt with the same method.

Suggestions please

Answer 1

[Walter Roberson]

If you have pure numeric data then typecast uint8 and encrypt that .

If you have a struct then you can break it into pieces and do those . Or you can look in the File Exchange for the "fast serialization" contribution .

[A.Mariya Jomet]

Sir,

Thank you for your response.

I am able to send all the details like, patient name, and some numerical data such as BP,temperature etc. All these are counted as a message and encrypting. But I need to upload some other informations, say ECG. which is a signal not a number. So what I am thinking is, if this ECG signal is converted into integer, then I cand encrypt using the same code along with the other data. Is this possile to convert so?

If not any suggestion to complete my work?

[Walter Roberson]

Do you mean that it is a Simulink signal ?

[A.Mariya Jomet]

Sorry for the late replay

I need to send patient's ECG data. Is it possible to make it as numerical values so that I can use the normal RSA encryption method.

I didn't fix what kind of data is the input. For the instant, I have the knowledge of ECG as 2D signals. Is their any other formats availiable?

or else is it possible to extract very important informations form ECG so that doctors can valuate that data for patient, even in the absant of ECG signal as such;

[Walter Roberson]

Is this a Simulink or Simscape question, when you refer to the ECG being a "signal" ? "signal" has special meaning for Simulink and Simscape.

If you are not using Simulink or Simscape, then for your existing ECG data that has been read in from a file, what is class() of the variable that is storing the ECG data?

[A.Mariya Jomet]

Sir, finally I get ECG signal from Massachusetts Institute of Technology-Beth Israel Hospital (MIT-BIH) database. And the .dat file of signal is opened in matlab,by using;

[filename, pathname] = uigetfile('*.dat', '100 .dat');% only image Bitmap
if filename<1, error([msg ' File: ' filename]), end
fid=fopen(filename,'r');
time=10;
f=fread(fid,2*360*time,'ubit12');
Orig_Sig=f(1:2:length(f));
plot(Orig_Sig)

Now I have ECG plot. Also the values are stored (3600*1 double) in the workspace. which i can seen in while opening the variable.

But now how can I encrypt this data?

I have RSA code for 16 bit data encryption. Is it possible to do the encryption of this signal with the mentioned format? If there is anything need to do before this, please let me know what are the steps

[Walter Roberson]

I posted above,

If you have pure numeric data then typecast uint8 and encrypt that .

Well, you have pure numeric data, so typecast it to uint8 and encrypt the typecast data.

[A.Mariya Jomet]

Thankyou sir,

I did that.

Y = typecast(Orig_Sig, 'uint8');

But even after it shows "Index exceeds matrix dimensions."

attaching the code

p=5861;
q=8387;
[Pk,Phi,d,e] = intialize(p,q);
%M = input('\nEnter the message: ','s');
M=Y;
x=length(M);
c=0;
for j= 1:x
    for i=0:122
   %for i=0:5760
        if strcmp(M(j),char(i))
            c(j)=i;
        end
    end
end
disp('ASCII Code of the entered Message:');
disp(c); 
% % %Encryption
for j= 1:x
   cipher(j)= crypt(c(j),Pk,e); 
end
disp('Cipher Text of the entered Message:');
disp(cipher);
% % %Decryption
for j= 1:x
   message(j)= crypt(cipher(j),Pk,d); 
end

how to solve this?

[A.Mariya Jomet]

Solved the problem.

First extract imprortant data from ECG signal, such as heart rate, QRS complex etc. And then encrypted it along with the other data.