Romanian programmers claim Skype leaves its local database unencrypted, that puts users’ sensitive information at risk. Users’ full name, birthday, phone numbers, country, city and even full chat conversations unencrypted on the systems’ hard drive in a known location without any encryption or password. Users advised to remove the main. content of main. Skype application and also provided a Linux based script to remove. the main main. database file, called main.db, created by the Skype software. Users just need to make it on every startup or make it encrypted in the encrypted container.
Source: https://thehackernews.com/2014/04/skype-leaves-sensitive-user-data.html