Recently, there are various cases to collect life logs for business applications. Service providers have been storing purchase records on POS (Point Of Sales), electronic money usages, route records for public transportations, sensing data from home devices and so on into cloud environment. Service providers have been analyzing such logs on the cloud to make important business decisions. On the other hand there is a critical issue of ensuring privacy. An example is shopping point 1 2 service. A Shopping center collects purchase history and calculates the total amount of purchase for a customer to provide shopping point service. While it is also useful for a customer to provide his purchase history as an account book, individual records may contain privacy information. Another example is connected home devices such as wireless scale 3 4. Customers are able to review weight history along with the suggestions for exercise program or supplements in the service. The weight itself is privacy information, of course. There are several cases where collecting data contain privacy information in many business scenes.
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