How OPAQUE works

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Last updated 10:59 PM on 4/30/26
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7 Terms

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Step 1

Alice converts her input to a group element x

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Step 2

Alice generates a random blinding factor r.

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Step 3

Alice blinds her input by computing blinded_input = xr

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Step 4

Alice sends the blinded_input to server.

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Step 5

Server computes blinded_output = (xr)k, where k is the secret key.

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Step 6

Server sends the result back to Alice.

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Step 7

Alice can then unblind the produced result by computing output = blinded_output(1/r) = xk, where 1/r is the inverse of r.