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Abstract-Revealing sensitive data to unauthorised personal is a serious problem to many organizations that can lead to devastating consequences. Traditionally, prevention of data leak was achieved through firewalls, VPNs and IDS, but without any consideration to sensitive data. In recent years new technologies such as the data leakage prevention systems (DLPs) are developed, especially to either identify and protect sensitive data or monitor and detect sensitive data leakage. One of the most popular approaches used in DLPs is content analysis, where the content of exchanged documents, stored data or even network traffic is monitored for sensitive data. Content of documents are analysed using mainly text analysis and text clustering methods. Moreover, text analysis can be performed using methods such as pattern recognition, style variation and N-gram frequency. In this paper we investigate the use of N-grams for data classification purposes. Our method is based on using the N-grams frequency to classify documents in order to detect and prevent leakage of sensitive data. We have studied the effectiveness of N-grams to measure the similarity between regular documents and existing classified documents.

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