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11

The digital signature algorithm encrypts a hash using the senders private key and the receiver's public key. Huh? I see two problems with the above statement; "Encryption"; using the word encryption implies that there's a way somehow to decrypt it. However, there's no way to anyone, even with the private key, to "decrypt" a signature to generate the ...

1

There are some possible advantages to threshold signing. First, it enables a more flexible setting where the key can be divided into $n$ parts and any subset of $t$ can be used to sign. Second, you can go from holding a single key in one place to distributing it and back without making any changes. Third, you can achieve a type of proactive security by ...

1

The algorithm needs to be restarted because the private key $x$ can be obtained when $s=0$. From: $s=[k^{-1}( H(M) + xr)] \mod q$ We can solve for $x$ and get: $x=\frac{-H(M)}{r} \mod q$

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