Since the turn of the millenium, Working Groups of the W3C have been concentrating on the development of XML based security stan- dards, which are paraphrased as XML Security. XML Security consists of three recommendations: XML (Digital) Signature, XML Encryp- tion and XML Key Management Speci cation (XKMS), all of them published by the W3C. By means of a review of the available literature the authors draw several conclusions about the status quo of XML Security. Further- more the current state and focuses of research as well as the existing challenges are derived. Trends to di erent application areas - e.g. use of XML Security for Mobile Computing - are also outlined. Based on this information the analyzed results are discussed and a future outlook is predicted.