A cipher or mode of operation is said to be malleable if it is feasible to modify ciphertext to produce meaningful changes in the corresponding plaintext without knowing the encryption key.

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Is there a malleable pubkey digital signature scheme?

I'm trying to find a special kind of Digital Signature Scheme. The scheme should allow me to transform a signature $s=\text{sign}(sk,m)$ (for a private key $sk$ and a message $m$) into a signature ...