There are many situations in which it is desirable to take
measurements of data which people consider sensitive. In these
cases, the entity taking the measurement is usually not interested in
people's individual responses but rather in aggregated data.
Conventional methods require collecting individual responses and then
aggregating them on some server, thus representing a threat to user
privacy and rendering many such measurements difficult and
impractical. This document describes a multi-party Distributed
Aggregation Protocol (DAP) for privacy preserving measurement which
can be used to collect aggregate data without revealing any
individual contributor's data.
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