<s>Human: 给定一篇英文文章，提取其中的关键词并列出前五个。
以下是文章的一部分： 
"The prevalence of smartphones and its increasing usage for online transactions have brought mobile security threats to the fore. Mobile devices are widely used for accessing corporate networks and information, and this has made them a prime target for cybercriminals. This article explores the most common types of mobile security threats and provides tips to stay protected."
</s><s>Assistant: 1. Mobile security 
2. Smartphones 
3. Online transactions 
4. Cybercriminals 
5. Corporate networks.
</s>