A decoding device that includes a decoding engine implemented by a processor connected to a memory. The decoding engine is configured to receive an encoded signal. The encoding engine is further configured to determine an encoded signal byte value at an encoded signal byte location in the encoded signal. The encoded signal byte location is mapped to a key map byte location in a key map. The decoding engine is further configured to determine a key map byte value at the key map byte location in the key map. The decoding engine is further configured to set a decoded signal byte value with the encoded signal byte value at the decoded signal byte location in a decoded signal. The decoding engine is further configured to output the decoded signal.