Abstract
End-to-end encryption is becoming common in messaging applications. E-mail can be said as one of messaging application, and its encryption has several standards and systems. However, it is hard to say that has spread enough. It has been pointed out that there are usability problems in message encryption. Even though various studies on message encryption and usability have been made, there is no paper discussing about utility function such as searching and sorting. In this paper, search function is focused. We aim to investigate the usability problems on encrypted search. Therefore, a method that applies encrypted search transparently, is proposed at first. Then implementation of proposed method is achieved using Google Chrome Extension for Gmail, and evaluation both performance and usability is conducted. We found that participants do not mind whether the search function is encrypted or not if both has almost identical UI and encrypted search operates at high speed.
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