round up the blob size calculation
we should round up the record for the blob size, in order to minimize information leaking. we can start with a simplistic ceiling-padding and substitute in the future for a more sophisticated algorithm (note however that it might be good to increase the block size with the blob size)
https://www.freehaven.net/anonbib/cache/traffic-padding-pets12.pdf
Remember to:
-
update documentation