`cosign` is my new program for cooperatively signing documents with RSA (PKCS#1 v1.5 + SHA256) in a way that requires all the parties to produce partial signatures on the document without any of them having access to the private key. github.com/osresearch/cosign

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@zwol OAEP includes a random bit string to avoid determinism, which makes it unsuitable for distributed signatures unless the parties agree on the randomness.

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