A Joint Encryption and Error Correction Method Used in Satellite Communications
This work proposes a novel scheme for AES based data hiding in encrypted texts. In the first work, a content owner encrypts the original uncompressed text using an encryption key. Then, a LDPC may compress the least significant bits of the encrypted text using a data-hiding key to create a sparse space to accommodate some additional data. With an encrypted text containing additional data, if a receiver has the data-hiding key, he can extract the additional data though he does not know the text content. If the receiver has the encryption key, he can decrypt the received data to obtain an text similar to the original one, but cannot extract the additional data. If the receiver has both the data-hiding key and the encryption key, he can extract the additional data and recover the original content without any error by exploiting the spatial correlation in natural text when the amount of additional data is not too large. In our project we give additional password to decrypt our text.
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