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Paper: Secure Cryptographic Workflow in the Standard Model

Authors:
M. Barbosa
P. Farshim
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URL: http://eprint.iacr.org/2006/450
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Abstract: Following the work of Al-Riyami et al. we define the notion of key encapsulation mechanism supporting cryptographic workflow (WF-KEM) and prove a KEM-DEM composition theorem which extends the notion of hybrid encryption to cryptographic workflow. We then generically construct a WF-KEM from an identity-based encryption (IBE) scheme and a secret sharing scheme. Chosen ciphertext security is achieved using one-time signatures. Adding a public-key encryption scheme we are able to modify the construction to obtain escrow-freeness. We prove all our constructions secure in the standard model.
BibTeX
@misc{eprint-2006-21941,
  title={Secure Cryptographic Workflow in the Standard Model},
  booktitle={IACR Eprint archive},
  keywords={public-key cryptography / Cryptographic Workflow. Key Encapsulation. Secret Sharing. Identity-Based Encryption.},
  url={http://eprint.iacr.org/2006/450},
  note={Indocrypt 2006 farshim@cs.bris.ac.uk 13480 received 28 Nov 2006},
  author={M. Barbosa and P. Farshim},
  year=2006
}