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Mediated encryption: analysis and design

Journal Article


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Abstract


  • Boneh, Ding and Tsudik presented identity-based mediated RSA encryption and signature systems in which the users are not allowed to decrypt/sign messages without the authorisation of a security mediator.We show that ID-MRSA is not secure and we present a secure modified version of it which is as efficient as the original system. We also propose a generic mediated encryption that translates any identity based encryption to a mediated version of this IBE. It envelops an IBE encrypted message using a user’s identity into an IBE envelope using the identity of the SEM. We present two security models based on the role of the adversary whether it is a revoked user or a hacked SEM. We prove that GME is as secure as the SEM’s IBE against a revoked user and as secure as the user’s IBE against a hacked SEM. We also present two implementations of GME based on Boneh-Franklin FullIBE system which is a pairing-based system and Boneh, Gentry and Hamburg (BGH) system which is pairing-free system.

UOW Authors


  •   Elashry, Ibrahim (external author)
  •   Mu, Yi (external author)
  •   Susilo, Willy

Publication Date


  • 2015

Citation


  • Elashry, I., Mu, Y. & Susilo, W. (2015). Mediated encryption: analysis and design. EAI Endorsed Transactions on Security and Safety, 15 (3), e2.

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=6416&context=eispapers

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers/5388

Start Page


  • e2

Volume


  • 15

Issue


  • 3

Abstract


  • Boneh, Ding and Tsudik presented identity-based mediated RSA encryption and signature systems in which the users are not allowed to decrypt/sign messages without the authorisation of a security mediator.We show that ID-MRSA is not secure and we present a secure modified version of it which is as efficient as the original system. We also propose a generic mediated encryption that translates any identity based encryption to a mediated version of this IBE. It envelops an IBE encrypted message using a user’s identity into an IBE envelope using the identity of the SEM. We present two security models based on the role of the adversary whether it is a revoked user or a hacked SEM. We prove that GME is as secure as the SEM’s IBE against a revoked user and as secure as the user’s IBE against a hacked SEM. We also present two implementations of GME based on Boneh-Franklin FullIBE system which is a pairing-based system and Boneh, Gentry and Hamburg (BGH) system which is pairing-free system.

UOW Authors


  •   Elashry, Ibrahim (external author)
  •   Mu, Yi (external author)
  •   Susilo, Willy

Publication Date


  • 2015

Citation


  • Elashry, I., Mu, Y. & Susilo, W. (2015). Mediated encryption: analysis and design. EAI Endorsed Transactions on Security and Safety, 15 (3), e2.

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=6416&context=eispapers

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers/5388

Start Page


  • e2

Volume


  • 15

Issue


  • 3