- Vivi Padova
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SEMINARI DI INFORMATICA
Giovedì 25 Luglio 2013 alle ore 15:00 in aula 1BC50 della Torre Archimede, Yogachandran Rahulamathavan (City University London, UK) terrà un seminario dal titolo "Low Complexity Attribute Based Encryption for Mobile Devices".
In multi-authority attribute based encryption (MA-ABE) schemes, multiple authorities monitor different set of attributes and the corresponding shared-decryption-keys. In such schemes the encryptor can encrypt a message and upload to the cloud, whereas only users who satisfy a set of attributes from each authority can decrypt that message. In this talk I will discuss how to extend the MA-ABE scheme for mobile users by introducing a cloud based semi-trusted-authority (STA) between the mobile user and attribute authorities. Hence, substantial amount of communications and computations are outsourced to the STA without compromising the security and privacy of the MA-ABE scheme. The STA interacts with the attribute-authorities on behalf of the user and obtains the masked shared-decryption-keys. Later the STA combines all the keys and gets one masked-key which can only be unmasked by a user to decrypt the message. In particular, STA cannot decrypt the message nor determine the attributes of the mobile user, hence, the security and privacy of the proposed MA-ABE scheme is preserved.