title: Proximity assurances based on natural and artificial ambient environments

authors: Gurulian, Iakovos

subjects: computer science

abstract: Relay attacks are passive man-in-the-middle attacks that aim to extend the physical distance of devices involved in a transaction beyond their operating environment. In the field of smart cards, distance bounding protocols have been proposed in order to counter relay attacks. For smartphones, meanwhile, the natural ambient environment surrounding the devices has been proposed as a potential Proximity and Relay-Attack Detection (PRAD) mechanism. These proposals, however, are not compliant with industry-imposed constraints that stipulate maximum transaction completion times, e.g. 500 ms for EMV contactless transactions. We evaluated the effectiveness of 17 ambient sensors that are widely-available in modern smartphones as a PRAD method for time-restricted contactless transactions. In our work, both similarity- and machine learning-based analyses demonstrated limited effectiveness of natural ambient sensing as a PRAD mechanism under the operating requirements for proximity and transaction duration specified by EMV and ITSO. To address this, we propose the generation of an Artificial Ambient Environment (AAE) as a robust alternative for an effective PRAD. The use of infrared light as a potential PRAD mechanism is evaluated, and our results indicate a high success rate while remaining compliant with industry requirements.

text: Proximity assurances based on natural and artificial ambient environments Relay attacks are passive man-in-the-middle attacks that aim to extend the physical distance of devices involved in a transaction beyond their operating environment. In the field of smart cards, distance bounding protocols have been proposed in order to counter relay attacks. For smartphones, meanwhile, the natural ambient environment surrounding the devices has been proposed as a potential Proximity and Relay-Attack Detection (PRAD) mechanism. These proposals, however, are not compliant with industry-imposed constraints that stipulate maximum transaction completion times, e.g. 500 ms for EMV contactless transactions. We evaluated the effectiveness of 17 ambient sensors that are widely-available in modern smartphones as a PRAD method for time-restricted contactless transactions. In our work, both similarity- and machine learning-based analyses demonstrated limited effectiveness of natural ambient sensing as a PRAD mechanism under the operating requirements for proximity and transaction duration specified by EMV and ITSO. To address this, we propose the generation of an Artificial Ambient Environment (AAE) as a robust alternative for an effective PRAD. The use of infrared light as a potential PRAD mechanism is evaluated, and our results indicate a high success rate while remaining compliant with industry requirements.

year: 2017

title: Exploring children's perspectives: Multiple ways of seeing and knowing the child.

authors: Peters, Sally

subjects: young children

abstract: This article focuses on human development in the early years, and the challenges for teachers and researchers in seeking to explore young children's perspectives. The current interest in listening to children's voices sits within competing developmental discourses about infants, toddlers and young children, which emphasise both their capability and confidence as well as their immaturity, especially with regard to oral language. Their "voice" can be heard and seen differently by teachers, researchers and families, who filter it according to their own perspectives and their image of the child. Drawing on a range of contemporary New Zealand studies, we discuss some key issues such as whether children need speech to have a voice? And in what ways can we gather children's perspectives in research and education? To explore children's perspectives and hear their voices requires skilled and flexible researchers and teachers, who watch and listen carefully whilst being mindful of their filtering/interpretive gazes. This takes time and patience and requires multiple ways of gathering data in order that the child is heard authentically.

text: Exploring children's perspectives: Multiple ways of seeing and knowing the child. This article focuses on human development in the early years, and the challenges for teachers and researchers in seeking to explore young children's perspectives. The current interest in listening to children's voices sits within competing developmental discourses about infants, toddlers and young children, which emphasise both their capability and confidence as well as their immaturity, especially with regard to oral language. Their "voice" can be heard and seen differently by teachers, researchers and families, who filter it according to their own perspectives and their image of the child. Drawing on a range of contemporary New Zealand studies, we discuss some key issues such as whether children need speech to have a voice? And in what ways can we gather children's perspectives in research and education? To explore children's perspectives and hear their voices requires skilled and flexible researchers and teachers, who watch and listen carefully whilst being mindful of their filtering/interpretive gazes. This takes time and patience and requires multiple ways of gathering data in order that the child is heard authentically.

year: 2011

title: A literary and linguistic critique of a Māori lullaby

authors: August, Tipene

subjects: waiata Māori

abstract: Māori song poems surviving from pre-colonial times can provide a valuable source of information about the artistic and cultural heritage of Māoridom. However, they present a number of challenges for the contemporary analyst. On the basis of a stylistic analysis of a Māori lullaby, a number of hypotheses about Māori song poems in general, and the lullaby in particular, are put forward and it is suggested that these hypotheses could be tested in relation to a corpus of song poems. It is hoped that the approach to stylistic analysis adopted here will be of use to scholars of Māori song poems and, perhaps, also to others who are interested in indigenous art forms more generally.

text: A literary and linguistic critique of a Māori lullaby Māori song poems surviving from pre-colonial times can provide a valuable source of information about the artistic and cultural heritage of Māoridom. However, they present a number of challenges for the contemporary analyst. On the basis of a stylistic analysis of a Māori lullaby, a number of hypotheses about Māori song poems in general, and the lullaby in particular, are put forward and it is suggested that these hypotheses could be tested in relation to a corpus of song poems. It is hoped that the approach to stylistic analysis adopted here will be of use to scholars of Māori song poems and, perhaps, also to others who are interested in indigenous art forms more generally.

year: 2001-02