ATMs may soon be armed with a mechanism that would spray hot foam in the face of the attacker if he tries to force it open.  

Researchers at ETH University in Zurich have reportedly developed a special film that triggers an intense reaction when destroyed. The team has developed a self-defending surface composed of several sandwich-like layers of plastic. If the surface is damaged, hot foam is sprayed in the face of the attacker.

The researchers also added a dye along with DNA enveloped in nanoparticles. If the film is destroyed, both the foam and the dye are released, thereby rendering the cash useless.

Attacks on ATMS have grown in alarming numbers in the recent past. Such new techniques and methods could surely help deter the potential thieves.