In my personal opinion, having ORCHIDs that are considered secure
now and could be estimated to be secure for the next 20 years or
so might be about the right size.
but in that case, you need to make ORCHIDs to support multiple hash
functions, since i guess it is not that clear that we will stick to
sha-1 for the next 20 years right?
ORCHIDs do support multiple hash functions, through different
prefixes. What comes to SHA-1, it is not clear whether it would last
for 20 years for the ORCHID purpose or not, but the same applies
pretty much to any other hash function.
--Pekka
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