This document provides guidance for the permissible uses for GCHQ registered trade and certification marks. It is intended for use by professionals and organisations who have been licensed to use the marks under the legal terms of GCHQ led external schemes. The marks must not be used by anyone who has not agreed and is abiding by the terms and conditions of the relevant scheme.
In this paper Clifford Cocks shows how it is possible for two parties to co-operate in generating the parameters for an RSA encryption system in such a way that neither individually has the ability to decrypt enciphered data.
In this paper Clifford Cocks shows how it is possible for any number of parties to co-operate in generating the parameters for an RSA encryption system in such a way that all must co-operate in order to decrypt enciphered data.
Surviving veterans of Bletchley Park and its outstations can claim a commemorative badge which will be presented to them by GCHQ on behalf of Her Majesty’s Government, in recognition of the contribution they made during World War II.