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Cellphones Technology

Smaller SIM Format Standardized 83

New submitter mk1004 writes "ETSI members have approved a new, smaller SIM format. 'The fourth form factor (4FF) card will be 40% smaller than the current smallest SIM card design, at 12.3mm wide by 8.8mm high, and 0.67mm thick. It can be packaged and distributed in a way that is backwards compatible with existing SIM card designs. The new design will offer the same functionality as all current SIM cards.' Nokia is not happy about the decision, as they believe their version was superior, but they say they're prepared to license the patents essential to the standard."
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Smaller SIM Format Standardized

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  • by Nkwe ( 604125 ) on Friday June 01, 2012 @05:06PM (#40186119)

    Is there any reason the SIM card would have to be physical?

    Yes. The SIM is a physical container that protects the computer and data inside it. Note that the SIM is actually a complete computer, not just a hunk of flash memory. When you access the SIM, the security sensitive stuff never actually leaves the SIM card. You don't have any actual access to the security sensitive stuff - the little computer inside the SIM accesses it on your behalf. If it were a software solution (virtual), you would have direct access (via a debugger or similar) to the security sensitive stuff (private keys). Since it is a very physically small hardware solution, you would have to physically disassemble it and hook up microscopic probes to the computer inside, which is very difficult.

"Well, it don't make the sun shine, but at least it don't deepen the shit." -- Straiter Empy, in _Riddley_Walker_ by Russell Hoban