English to Chinese Tech/Engineering Computers: Software mobile security

Trend 5: More and more sophisticated security threats are appearing as new devices provide {richer targets}.

Although, so far, infestation of wireless handsets by Internet-based security threats has been relatively low, new threats to mobile devices, including malicious programs (viruses, worms and Trojan horses) continue to appear. In just the last few months, two new Trojan horse viruses, one targeting Symbian SMS messages and another targeting specific Windows Mobile programs; two new worms, one targeting particular Symbian phones and one targeting multimedia cards; and a new spy-ware application have shown up in the market. Thankfully, none of these malicious bits of code have caused widespread damage. However, despite the fact that the current threat is not particularly high, most industry experts are saying that the iPhone, Android, and mobile devices with WiFi and other broadband capabilities will undoubtedly be {rich targets} for malware and viruses in the coming years.
这个rich指“诱人的”还是“数量众多的”意思？还是其他？