DNA profiles can reveal a number of details about individuals, and even about their family members. There are laws in place that regulate the trade of gene data, which has become much simpler and cheaper to analyze today. However, these laws do not apply to an equally relevant type of genetic data, so-called microRNAs, even though these can also point to serious diseases. This means that anonymity needs to be strictly maintained in microRNA studies as well. Researchers from the Research Center for IT Security, CISPA, have now been able to show that a few microRNA molecules are sufficient to draw conclusions about study participants. The computer scientists will be presenting their means of attack, and appropriate countermeasures, at the Cebit computer fair in Hannover (Hall 6, Stand C47).