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Secure Cryptographic Workflow in the Standard Model

Research output: Chapter in Book/Report/Conference proceedingConference contribution

  • Manuel Barbosa
  • Pooya Farshim
Original languageEnglish
Title of host publicationProgress in Cryptology - INDOCRYPT 2006
Publisher or commissioning bodySpringer Berlin Heidelberg
DatePublished - 2006


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.

Additional information

ISBN: 9783540497677 Publisher: Springer Verlag Name and Venue of Conference: Progress in Cryptology - INDOCRYPT 2006 Other identifier: 2000624

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