Asecret sharing scheme for multiple associating group key management in secure group communications

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Shared file is encrypted and stored in server then group member shares its decryption key as an implementation of secure group communication. User has the same number of group decryption key as multiple associating groups in the communication. This research proposes a group file sharing protocol and group management protocols using ElGamal threshold cryptosystem and secret sharing scheme, which can decrypt file decryption key shared in any associated groups by one group key.