"I was absolutely stunned that this is happening and I think there is a very clear privacy breach going on here," one emailed.
"The IRD seem to be saying: we have a secure method (hashed data) to communicate with data-hungry multinational tech organisations... that's a bad argument," another said.
"Using hashing or other data aggregation in this context is, sadly, just a technological sleight-of-hand trick to bamboozle," he said.
"Hashing is a type of cryptographic security method... and cannot be reversed so identities are protected," it said.
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