A threshold cryptosystem without a trusted party

  • Authors:
  • Torben Pryds Pedersen

  • Affiliations:
  • Aarhus University, Computer Science Department

  • Venue:
  • EUROCRYPT'91 Proceedings of the 10th annual international conference on Theory and application of cryptographic techniques
  • Year:
  • 1991

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Abstract

In a threshold cryptosystem n members share the secret key of an organization such that k members (1 ≤ k ≤ n) must cooperate in order to decipher a given ciphertext. In this note it is shown how to implement such a scheme without having a trusted party, which selects the secret key and distributes it to the members. In stead, the members choose the secret key and distributes it verifiably among themselves. Subsequently, this key can be used for authentication as well as secret communication.