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Stick with Keccak-256/SHA3 for now 

See https://github.com/ethereum/eth2.0-specs/issues/218
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Justin 2018-12-04 15:50:44 +00:00 committed by GitHub
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specs/core/0_beacon-chain.md
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@ -1560,7 +1560,7 @@ while len(state.persistent_committee_reassignments) > 0 and state.persistent_com
# Appendix
## Appendix A - Hash function
We aim to have a STARK-friendly hash function `hash(x)` for the production launch of the beacon chain. While the standardisation process for a STARK-friendly hash function takes place—led by STARKware, who will produce a detailed report with recommendations—we use `BLAKE2b-512` as a placeholder. Specifically, we set `hash(x) := BLAKE2b-512(x)[0:32]` where the `BLAKE2b-512` algorithm is defined in [RFC 7693](https://tools.ietf.org/html/rfc7693) and the input `x` is of type `bytes`.
In Phase 0 the beacon chain is deployed with the same hash function as Ethereum 1.0, i.e. Keccak-256 (also incorrectly known as SHA3). We aim to migrate to a S[T/N]ARK-friendly hash function in a future Ethereum 2.0 deployment phase.
# References