bit-stream encryption using AES

I am trying to encrypt binary vector using AES encryption in matlab, the problem is that I want the output to be binary vector aswell, and the same size as the original binary vector, is that possible ? and if yes, how can I do that ?

Answer 1

[Walter Roberson]

Note that due to US laws, we are not able to discuss the implementation of AES in this forum. However, your question does not depend upon the implementation of AES, so it can be discussed.

You will need to pack your bits together into 8 bit bytes and encrypt the sequence of bytes; then unpack the sequence of encrypted bytes to form a sequence of bits.

ByteVector = bin2dec( char(reshape(BitVector, 8, []).' + '0') );

But first you have to pad BitVector out to a multiple of 8 bits.

Then you can encrypt ByteVector. Then afterwards

EncryptedBitVector = reshape( dec2bin( EncryptedByteVector, 8) .' - '0', 1, [])

This will almost certainly be longer than the original vector due to the way that AES works.

[Mohab Mostafa]

Thank you, it works :)

[roja chigiti]

my plaintext is of size 32X1 I applied aes to it and i wanted to check decrypted value matches to the plain text or not but they are not equal

i am not getting where I am doing wrong. kindly guide me through it. below is my code

[CODE REMOVED]

[Walter Roberson]

roja chigiti,

Note that due to US laws, we are not able to discuss the implementation of AES in this forum. I removed your code, which contained an implementation of AES.

[roja chigiti]

thank you, i will keep in mind.