Error Detection/Correction technique for Encypted Data I will be very pleased if anyone can clarify me that, can we use the same error detection/correction techniques like (Convolutional code) for the error detection/correction of encrypted data.
Or do we need separate techniques for plain data &amp; encrypted data?

Thanks,
Not only is it easier to do error correction/detection after encryption, it is risky to do the error correction before encryption.

This is because the attacker would know parity check relations (in the typical case of a linear code being used) between the bits of the plaintext, which could get them started on an attack.