Identity Based Encryption (IBE) solutions overcome the key management problem as the public key of the user can be represented by any valid string, such as the email, unique id and username. Hence, it is important to protect user’s sharing information, such as text and media content, as well as the identity of the recipients as it can contain private and sensitive information. In light of recent events, such as Edward Snowden’s whistle-blowing on US surveillance programs, OSN providers have an interest to maintain their users and a privacy-friendly image. Arguably, current centralized OSNs are here to stay and will continue to be actively used by millions of people. Completely new architectures represent a difficult step for users as the trade-off of moving away from the commonly used social ecosystem compared with the risk of losing interactions is high. formalize cryptographic models for private profile management achieving confidentiality and unlinkability, however their sharing information protocols similar complex key management do not protect privacy of the recipients. ![]() In general, those solutions suffer from user adoption and key management issues as users are required to register and then share, certify and store public keys. Several solutions have been proposed advocating the use of cryptographic mechanisms to address the privacy issues, either by an add-on atop of existing OSNs, ,, , or by complete new privacy-friendly architectures, mainly decentralized. Īll these worrisome issues motivate the need for effective techniques to properly protect user’s privacy in OSNs. As proved by recent events like the PRISM project and the iCloud breach. ![]() In addition, these preferences do not exclude providers along with the dangers of data beaches and leaks nor government. Although users are allowed to configure “privacy preferences” to limit access and select which users or groups can access the shared content, these preferences are generally too coarse-grained and difficult to configure. ![]() At the same time, OSNs store large amounts of data which prompts several privacy concerns, in particular as it is possible to infer a considerable amount of sensitive information from the shared and stored content. OSNs offer users an efficient and reliable channel to distribute and share information. Online Social Networks (OSNs), such as Facebook, Google+, and Twitter present a significant growth and have become a prominent communication channel for many millions of users.
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