دانلود رایگان مقاله اشتراک گذاری خصوصی مبتنی بر هویت عملی برای شبکه اجتماعی آنلاین

Abstract

Online Social Networks (OSNs) constitute vital communication and information sharing channels. Unfortunately, existing coarse-grained privacy preferences insufficiently protect the shared information. Although cryptographic techniques provide interesting mechanisms to protect privacy, several issues remain problematic, such as, OSN provider acceptance, user adoption, key management and usability. To mitigate these problems, we propose a practical solution that uses Identity-Based Encryption to simplify key management and enforce data confidentiality. Moreover, we devise an Identity-Based outsider anonymous private sharing scheme to disseminate information among multiple users. Furthermore, we demonstrate the viability and tolerable overhead of our solution via an open-source prototype.

8 7. Conclusion

Identity Based Encryption (IBE) solutions provide desirable prop- erties to construct mechanisms to deliver privacy in OSNs. The min- imal additional architectural support and the increased ease of key management represent a major motivation to implement IBE in OSNs. We developed an Identity-Based outsider anonymous private sharing (oANOPS) scheme that protects user shored content in OSNs. With such scheme, we show that using secret sharing and multi-PKGs there is no need to have a single trusted party, assuming that at least t − 1 of the PKGs are compromised, as well as users key exchange and ver- ification. Furthermore, assuming the competing business models of OSNs, the multiple PKG infrastructure can be maintained by several OSN providers. This can be motivated by an additional and attrac- tive privacy-friendly label, thus creating more incentives towards pri- vacy concerned users. In addition, users are provided with the option to use multiple identities, that they can use interchangeably among OSNs, e.g., use Twitter id as a public key in Facebook. In contrast to previous solutions, it is possible to share content with users not hold- ing private keys to their identity as the valid public key is directly rep- 636 resented by their id in the OSN. This forces curious users to register if they wish to view the protected content shared with them. Lastly, we have extended Scramble and demonstraated that such extension presents a tolerable overhead to end-users.