ethernet RS-232 security communication

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!
> i have a problem with my choice. I want to use 10Mbit etherned device
> 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)?

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

On Tue, 12 Apr 2005 14:57:53 -0500, "koutas" <matesmk1@seznam.cz>
wrote:

>hi!
>i have a problem with my choice. I want to use 10Mbit etherned device
>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 ;)
>


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.

"Johnny" <john_wr@NOSPAM.hotmail.com.> wrote in message
news:8rmp51p2hf5kkt47lsob92v6t90u1mb3qs@4ax.com...
> On Tue, 12 Apr 2005 14:57:53 -0500, "koutas" <matesmk1@seznam.cz>
> wrote:
>
> >hi!
> >i have a problem with my choice. I want to use 10Mbit etherned device
> >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 ;)
> >
>
>
> 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.

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.

>
> 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.

I agree, these days I'd look seriously at an ARM with on-chip Ethernet.

regards
Charles

On Thu, 21 Apr 2005 13:15:04 +1200, "Charles Oram" <charles at
pwrshield dot com> wrote:

>"Johnny" <john_wr@NOSPAM.hotmail.com.> wrote in message
>news:8rmp51p2hf5kkt47lsob92v6t90u1mb3qs@4ax.com...
>> On Tue, 12 Apr 2005 14:57:53 -0500, "koutas" <matesmk1@seznam.cz>
>> wrote:
>>
>> >hi!
>> >i have a problem with my choice. I want to use 10Mbit etherned device
>> >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 ;)
>> >
>>
>>
>> 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.
>
>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 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.

>> 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.
>
>I agree, these days I'd look seriously at an ARM with on-chip Ethernet.
>
>regards
>Charles

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.