Post Mortem: A single whitespace character

Re:Post Mortem: A single whitespace character by ctz on Monday October 27, 2014 @12:55PM (#8516626)

You cannot physically fit a whole SSL datagram (max size 16KB) into 8KB of RAM. SSL requires multiple passes over the data to (eg) decrypt and verify a datagram. At this point, you cannot use standard SSL at either the server side or client side.

On the subject of reliablity: a 8 bit uC running at 16MHz needs a long time to do the public key crypto required to set up the connection. This means you need a GSM data link to be continuously available for a longer period.

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Re:Post Mortem: A single whitespace character by pjc50 on Monday October 27, 2014 @01:10PM (#8516720)

This is true, but if you're using GSM you have a much beefier processor handling the GSM side and there's no need to use a tiny microcontroller. Some of the GSM modules will offload the whole HTTP(S) request for you.

Edit: or you could get a Cortex-M0 with 32K RAM for $2.

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Re:Post Mortem: A single whitespace character by MichaelGG on Monday October 27, 2014 @07:00PM (#8518673)

SSL supports a null cipher, so why not use that? The handshake alone may be enough to prevent packet inspection.

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