Sophos use ROT13 over DNS.
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I think Kevin and I were talking about doing such lookups through DNS, which is extremely common.
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Right, I don't care about hostnames too much, but if it's more than that - common or not - that's not cool.
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It’s not plaintext, it’s ROT13

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In ancient Rome this was considered military grade encryption.
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I know Avast used to do it with a chrome extension, but we told them they need to stop that or they're out of the webstore... I think they agreed to start sending them over https.