updating Readme

README.md

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 # openSSL-DICE
 Simulated implementation of DICE based on microsoft paper on dice n riot. initial implementation, later to be implemented on Jetson Xavior
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+Step 1 - skeletal setup
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+sketch roadmap of dataflow
+lable functions
+locate input and output DS
+find appropriate openssl fns
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+Step 2 - codify
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+use static value for ids, eg UDS, FW
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+Step 3 - replace static IDs with real values
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+use real values from device? use rng?