HC Deb 22 July 1977 vol 935 cc734-5W
Sir B. Rhys Williams

asked the Secretary of State for Defence what is the cost of his current programme of research into systems to protect the confidentiality of official microwave telephone transmissions in urban areas; and if he proposes to make available the results of his research for protection of private and commercial transmissions.

Dr. Gilbert

Encryption facilities are available to protect official telephone conversations which contain classified information, whether or not these telephone conversations are carried on microwave circuits; and there is continuing research into ways of improving and extending this protection. It would not be in the public interest to give any details of the protection provided or of the resources which are allocated to the research effort. The protection of other than official conversations is a matter for the individual subscriber.

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