The ASVspoof initiative follows on from the first special session in Spoofing and Countermeasures for Automatic Speaker Verification (ASV) held during the 2013 edition of INTERSPEECH in Lyon, France. ASVspoof 2015, a special session held during the 2015 edition of INTERSPEECH in Dresden, Germany incorporates a standard challenge designed to support, for the first time, independent assessments of vulnerabilities to spoofing and of countermeasure performance. The initiative provides a level playing field to facilitate the comparison of different spoofing countermeasures on a common dataset, with standard protocols and metrics. While preventing as much as possible the inappropriate use of prior knowledge, the challenge also aims to stimulate the development of generalised countermeasures with potential to detect varying and unforeseen spoofing attacks. This talk will describe the challenge, data protocols and metrics and will also provide a brief summary of participation and challenge results.