Bilinear groups are often used to create Attribute-Based Encryption (ABE) algorithms. In particular, they have been used to create an ABE system with multi authorities, but limited to the ciphertext-policy instance. Here, for the first time, we propose a multi-authority key-policy ABE system. In our proposal, the authorities may be set up in any moment and without any coordination. A party can simply act as an ABE authority by creating its own public parameters and issuing private keys to the users. A user can thus encrypt data choosing both a set of attributes and a set of trusted authorities, maintaining full control unless all his chosen authorities collude against him. We prove our system secure under the bilinear Diffie-Hellman assumption.

Key-Policy Multi-Authority Attribute-Based Encryption / Longo, Riccardo; Marcolla, Chiara; Sala, Massimiliano. - STAMPA. - 9270:(2015), pp. 152-164. ((Intervento presentato al convegno CAI 2015 tenutosi a Stuttgart nel 1st September-4th September 2015 [10.1007/978-3-319-23021-4_14].

Key-Policy Multi-Authority Attribute-Based Encryption

Longo, Riccardo;Marcolla, Chiara;Sala, Massimiliano
2015

Abstract

Bilinear groups are often used to create Attribute-Based Encryption (ABE) algorithms. In particular, they have been used to create an ABE system with multi authorities, but limited to the ciphertext-policy instance. Here, for the first time, we propose a multi-authority key-policy ABE system. In our proposal, the authorities may be set up in any moment and without any coordination. A party can simply act as an ABE authority by creating its own public parameters and issuing private keys to the users. A user can thus encrypt data choosing both a set of attributes and a set of trusted authorities, maintaining full control unless all his chosen authorities collude against him. We prove our system secure under the bilinear Diffie-Hellman assumption.
Algebraic Informatics
Heidelberg
Springer Verlag
978-3-319-23020-7
978-3-319-23021-4
Longo, Riccardo; Marcolla, Chiara; Sala, Massimiliano
Key-Policy Multi-Authority Attribute-Based Encryption / Longo, Riccardo; Marcolla, Chiara; Sala, Massimiliano. - STAMPA. - 9270:(2015), pp. 152-164. ((Intervento presentato al convegno CAI 2015 tenutosi a Stuttgart nel 1st September-4th September 2015 [10.1007/978-3-319-23021-4_14].
File in questo prodotto:
File Dimensione Formato  
CAI.pdf

accesso aperto

Descrizione: Articolo
Tipologia: Post-print referato (Refereed author’s manuscript)
Licenza: Tutti i diritti riservati (All rights reserved)
Dimensione 138.69 kB
Formato Adobe PDF
138.69 kB Adobe PDF Visualizza/Apri

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione

Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11572/117183
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 2
  • ???jsp.display-item.citation.isi??? 2
social impact