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Military and government organisations have put in place elaborate methods of passing secret keys: they pass secrets more generally so using similar channels to pass an encryption key is not a great leap. However, as everyone has become more connected, and especially with the commercialisation of the Internet, encryption has become a requirement for the vast majority of networked users. Thus, the traditional methods of passing secret keys is impractical, if only because you might not actually know who you want to communicate with in an encrypted fashion. It was realised in the 1970’s that encryption needed to be more accessible, so a great deal of work was done on algorithms that could ensure that a key had been passed over relatively insecure channels was not compromised. Leaders in the field were Whifield Diffie and Martin Helman.
