If you do the padding and signaling of last nodes correctly, which as far as we know BLAKE2 does, a break in the parallel mode translates to a break in the sequ

If you do the padding and signaling of last nodes correctly, which as far as we know BLAKE2 does, a break in the parallel mode translates to a break in the sequential hash function. This was proven by the Keccak people a while ago [1]. [1] http://eprint.iacr.org/2009/210 http://eprint.iacr.org/2009/210