Abstract. Social network sites (SNS) allow users to share information with friends, family, and other contacts. However, current SNS sites such as Facebook or Twitter assume that users trust SNS providers with the access control of their data. In this paper we propose Scramble, the implementation of a SNS-independent Firefox extension that allows users to enforce access control over their data. Scramble lets users define access control lists (ACL) of authorised users for each piece of data, based on their preferences. The definition of ACL is facilitated through the possibility of dynamically defining contact groups. In turn, the confidentiality and integrity of one data item is enforced using cryptographic techniques. When accessing a SNS that contains data encrypted using Scramble, the plugin transparently decrypts and checks integrity of the encrypted content.

Traditional criteria used in biometric performance evaluation do not cover all the performance aspects of biometric template protection (BTP) and the lack of well-defined metrics inhibits the proper evaluation of such methods. Previous work in the literature focuses, in general, on a limited set of criteria and methods. This paper provides the first holistic approach to the evaluation of biometric template protection that is able to cover a whole range of methods. We present a selection of well-defined criteria and some metrics that are compliant with the reference architecture for template protection as defined in the recently adopted standard ISO/IEC 24745 (2011), which is applicable to nearly all known BTP methods. The criteria have been grouped in three categories of performance: technical, protection, and operational.

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