A possible realization in the future could be a quantum cryptographical
method that helps in instant detection of any change inflicted on data.
The beginning shipment of the high-end boxes as well as support for advanced cryptographical
software for the boxes, which started shipping in August, should significantly boost IBM's Systems Group's prospects for increased sales and profits in the fourth quarter.
Up until 1975, cryptographical
methods consisted mainly of transposition ciphers -- codes for replacing one character with another in some random fashion, in varying numbers of layers and complexity.
Indeed it is still a matter of debate whether Freyberg himself was aware of the cryptographical
provenance of the information he was receiving, though MacDonald does produce evidence that he was.