While random eavesdropping is likely to capture random unusable fragments of data and the security features together with the encryption techniques of the contactless card render the data useless for fraudulent usage, it is possible for someone to skim a contactless card if a fraudster’s contactless-enabled terminal is within a 2cm to 10cm range. The risk of such fraud is heightened significantly if you are in a public place where a lot of people have gathered. It is therefore advisable to keep cards that you don’t intend to use for such gatherings at home in a safe place.