[cryptography] embbeded pw kdf?

stef s at ctrlc.hu
Fri Aug 5 06:07:50 EDT 2016

dear list,

with the spectre of IoT looming over us - making us all warm and fuzzy about
our memories of security in the 80ies - i was wondering, if you have an 32bit
(not considering 8bit systems for their very limited support for crypto)
embedded device with heavily constrained processing power and memory (<0.5MB)
but still enough to perform all basic crypto algos, how would it be the best
do derive a key from user input (assuming we have a keypad e.g.) argon2 seems
to be optimized for PCs. is the best one can do in such situations a naive:

H0 = password
H_n = hash(H_n-1, device unique salt), 1<=n<max_iterations

thanks for any insights,s

otr fp: https://www.ctrlc.hu/~stef/otr.txt

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