original: Secondly, it should be computationally infeasible to generate a valid signature for a party who does not possess the private key.
simplifications: It should be computationally infeasible to generate a valid signature for a party who does not possess the private key. Also, it should not be possible to make a usable signature for a group that does not have a private key. It also should be almost impossible to generate a working signature for anyone without the private key. It should be impossible to generate a valid signature for a party without the private key. Secondly, it should be computationally infeasible to create a valid signature for someone who does not have the private key. Secondly, it should be impossible to make a good signature for a person who does not have the private key. It would be impossible for a computer that does not have the security code to create a valid key. It should be impossible to create a valid signature for a party who does not have the private key. Secondly, it should be hard to generate a valid signature for someone who does not possess the private key. Second, it should be algorithms impossible to generate a valid signature for a party that does not have a private key.