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RetroShare lets you communicate and share files securely. It is a cross-platform private p2p sharing program. It lets you share securely your friends, using a web-of-trust to authenticate peers and OpenSSL to encrypt all communication. It provides filesharing, chat, messages and channels
它的目标是要做一个安全的IM以及文件共享的P2P服务.但对于这个领域来说,它不太靠谱,并且它并没能支持三大IM服务
