The BADGERS 2011 workshop, held in Salzburg, Austria, aimed to encourage the development of large-scale security-related data collection and analysis initiatives. The workshop provided an environment for describing existing real-world datasets and sharing experiences gained from analyzing such data. It also presented novel approaches to collecting and studying these datasets. The program committee accepted 15 papers out of 21 submissions, covering topics such as testbeds for studying current attacks, large-scale data collection systems, and legal issues associated with data collection and sharing. The accepted papers addressed a range of issues, including testbeds for studying current attacks, large-scale data collection systems, and legal issues related to data collection and sharing. The workshop was intended to promote better sharing of data and knowledge in the field of security research.The BADGERS 2011 workshop, held in Salzburg, Austria, aimed to encourage the development of large-scale security-related data collection and analysis initiatives. The workshop provided an environment for describing existing real-world datasets and sharing experiences gained from analyzing such data. It also presented novel approaches to collecting and studying these datasets. The program committee accepted 15 papers out of 21 submissions, covering topics such as testbeds for studying current attacks, large-scale data collection systems, and legal issues associated with data collection and sharing. The accepted papers addressed a range of issues, including testbeds for studying current attacks, large-scale data collection systems, and legal issues related to data collection and sharing. The workshop was intended to promote better sharing of data and knowledge in the field of security research.