The US National Institute of Standards and Technology has published draft guidelines that address the security risks associated with mobile phones and portable computing devices.
Nist is seeking comments on the draft, which proposes a best practice framework for the use of mobiles and PDAs.
"The security issues for cellphones and PDAs range beyond those of other computer equipment," said the authors.
"Moreover, many common safeguards available for desktop and networked computers are generally not as readily available across a broad spectrum of handheld device types."
The document notes that some security enhancements better known in the personal computer world are becoming available for PDAs and smartphones.
These include stronger user authentication systems based on biometrics, firewalls, antivirus and intrusion detection software.
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