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Order-preserving encryption (OPE) allows encrypting without losing information about the order relation between the encrypted data items. Thus, the execution of compare, order and grouping operations can be done likeonplaintext data. In particular it allows databases to do range queries overencrypted data, which is auseful feature especially for cloud(More)
Spaltenfamiliendatenbanken (engl.: „column family databases“ oder „wide column stores“) sind wegen ihres flexiblen Datenmodells beliebt, das eine weitgehend schemalose Datenverwaltung ermöglicht. Diese Datenbanken (insbesondere HBase und Cassandra als quelloffene Produkte) werden auch von einigen großen Cloud-Dienstanbietern als Database-as-a-Service(More)
Provision of internet access in infrastructure deficient areas is expected to bring profound economic and humanitarian benefit to developing countries. Notwithstanding, achieving this goal poses an economic and technical challenge. Due to technological and economical reasons cellular networks are regarded to be unable to deliver affordable distribution in(More)
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