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Unfortunately the previous answers given to this question, are not only wrong, but also quite dangerous. While it is certainly true that digital signatures usually involve hash functions, which by its nature are inherently deterministic, you should note that digital signatures are more than just a simple hash. They involve public key cryptography, which is ...


Signing with RSA in OpenPGP is deterministic and thus does not require a source for randomness as you described correctly. Hashing the data to be signed is deterministic as long not padded with a random seed (see @Karol Babioch's answer for details why one might want to do so), signing the hash also is. Detailed discussion of the parts involved: RSA ...

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