Trend Micro chairman Steve Chang warned in an interview published today that Android was significantly more open to attack than iOS. Google's decision to allow some open-sourcing and to have only a light approval touch let malicious coders get more information about how to stage viruses and other malware. Apple's decision to close off much of the iPhone OS, sandbox code and to vet apps more closely may have antagonized some, Chang told Bloomberg, but has also led to a more secure platform.