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A comment on You might not need to store plaintext email addresses. Parent comment

Re:You might not need to store plaintext email addresses by benlivengood on Monday November 02, 2020 @11:50AM (#24970118)
It's pretty scalable. 10 billion email addresses times 16+32+4 bytes of salt, SHA512/256, and ID is 520GB of RAM; available in a single (big) machine and searchable in under a second with a few cores.

Shard it into multiple machines for higher QPS.

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