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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 WorkflowKey EncapsulationSecret SharingIdentity-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