hi! i have a problem with my choice. I want to use 10Mbit etherned devic CS8900a. And i cant decide for cpu and system. Comunication will be security PC -> CS8900A maybe SSL or..? Which good conjunction i can use(microcontroller&system)?
btw.sorry for my english ;)
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hi!
Depends if you have a open or closed system. If you gan get the remote devices through your hands, before they are deployed (closed system) use a symmetric algorithm like AES or RC4. If anybody can buy the devices and add them willy-nilly to the system (open system) a form of PKI may be necessary. SSL is a nightmare on embedded devices and only usefull if you have to connect to an existing infrastrucure.
Wim
I think that if you need SSL, a Linux based SBC might be a good choice, but you will need a significant amounts of RAM, FLASH and processing power to run it.
On the other hand, if you want a simple low cost device you might consider using CS8900 and a processor with a bus interface. Maybe an ARM7 from atmel or Phillips. If you don't mind using single supplier solution, you can look at modules based on Netsilicon processors that include LAN and a RTOS, I think some of them might even do SSL.
regards, Johnny.
It depends on what you mean by "significant amounts of RAM, FLASH and processing power ". A few years ago I got SSL going on a board with a 25MHz Intel 386EX, 8MB Flash and 4MB RAM and the performance was acceptable for the application. Bringing up a connection took a few seconds because the public key encryption wasn't that fast, but once the SSL handshake was out of the way the overhead was a lot less.
I agree, these days I'd look seriously at an ARM with on-chip Ethernet.
regards Charles
I think 4MB RAM is quite a lot. I suspect you needed this mostly becuase you were running Linux, and a many embedded RTOS implementations woud use a small fraction of that.
Agree with which part? That an ARM7 is a good choice in general, or specifically the Netsilicon silicon / development tool package?
Any experience with Netsilicon tools and OS? (I have not).
regards, Johnny.
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