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In this paper, we suggest the rolls scheme using dynamic identity-based broadcast encryption. Using this scheme, it is possible to parted a message to many parts, and allow to some users to read special different parts in a message. General Terms Social network service (SNS) market is stretch over worldwide, and then there are many security threats by attackers. In addition because sensitive data is concentrated on the central server, privacy can be exposed to SNS provider as well as malicious users. To overcome this problem, many previous researches suggest decentralized system for SNS. In these systems sensitive data may not be stored in central server. When a user transmits a message, then server does not interfere with the process. Thus, the user who transmits a message needs way to message the key that are used to message the key that are used for message encryption scheme.

P2P Social Network with Dynamic Identity-based Broadcast Encryption using Rolls