Secure Cryptographic Workflow in the Standard Model

M.  Barbosa; P.  Farshim

Paper 2006/450

Secure Cryptographic Workflow in the Standard Model

M. Barbosa and P. Farshim

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.

Note: This is the full version of the paper.

Metadata

Available format(s): PDF PS
Category: Public-key cryptography
Publication info: Published elsewhere. Indocrypt 2006
Keywords: Cryptographic Workflow Key Encapsulation Secret Sharing Identity-Based Encryption.
Contact author(s): farshim @ cs bris ac uk
History: 2006-12-04: received
Short URL: https://ia.cr/2006/450
License: CC BY

BibTeX

@misc{cryptoeprint:2006/450,
      author = {M.  Barbosa and P.  Farshim},
      title = {Secure Cryptographic Workflow in the Standard Model},
      howpublished = {Cryptology {ePrint} Archive, Paper 2006/450},
      year = {2006},
      url = {https://eprint.iacr.org/2006/450}
}