1. A cipher processing system, comprising: a key store for storing a first secret key; a first data store for receiving and storing at least a portion of first stream of data and a portion of at least a second stream of data; and a cipher processor for ciphering the first stream of data and the second stream of data in accordance with a first cipher process and the first secret key to provide output data, during ciphering of the first data interleaving processing of rounds for the first data within the cipher processor with processing of rounds for at least the second stream of data for ciphering in accordance with at least a portion of the first cipher process, at least the second stream of data for being ciphered within a sequence of the first cipher processor operations and scheduled for obfuscating the output data.