This paper discusses the use of secret sharing cryptographic protocols for top secret and high security codes which may be used in the context of military and information warfare and Cyber-Security for Cloud Computing and e-Health. In particular a framework for secret sharing using threshold cryptographic methods in order to distribute and share high security and top secret access and authorization tokens on Java Cards is presented. An implementation of this framework, a proof of concept, is described that uses as a base an existing European Electronic Identity Smart-Card, more commonly known as e-ID card or Citizen Card, that makes use of the associated national Public Key Infrastructure (PKI) and time stamping infrastructure. Details of the cryptographic sharing algorithm based on an existing well known secret sharing scheme that uses polynomial interpolation over a finite field are given and also the secret distribution and secret recovery protocols are specified. Since Smart-Cards often have only a relatively small writable memory we shall discuss key sizes and the impact this has on the amount and size of secret shares that can be stored. A secret sharing scheme is a collaborative system and this paper shows how this may be implemented using the concept of a Chat Room whose members are able to collaborate in the process of secret sharing and recovery.
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