Charles A. Clarke

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In this paper, we are concerned with techniques for establishing confidentiality of user-generated content (UGC), shared in centralised and untrusted online social networks (OSNs). We describe how the concepts of secret sharing and steganography can be combined to result in a technique for sending confidential messages, as part of a proposed architecture(More)
As businesses, governments and professional institutions progressively seek to engage with consumers via social media platforms (SMPs), the capacity of SMP users to validate the source of received content and its integrity, becomes increasingly significant. Historically, SMPs have an associated legacy of security concerns, many of which pertain to content(More)
Virtual Private Social Networks (VPSNs) are a concept that aims at improving the security attributes of untrusted, centralised Online Social Networks (OSNs). Originally conceived with the goal of establishing privacy of user profile data, we propose an extension to the scope of a VPSN to provide confidentiality of shared data in the form of user-generated(More)
In this paper, we describe and evaluate Hide-as-you-Type, a prototype steganographic system, designed to hide secret bits in the digest chains of natural language sentences. Through an interactive embedding process that incorporates keyed hash functions and human reviewed sentences, the system generates two innocuous natural language carriers that(More)
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