Digital signature which leads to
Public-key cryptography says on the right side -
In a signature scheme the private key is needed to sign a message; but anyone can check the signature using the public key. Validity depends on private key security.
It means that for Qb 2 & 3 are correct.
However, I'm not sure why above it, it says -
In an encryption scheme anyone can encrypt using the public key, but only the holder of the private key can decrypt. Security depends on the secrecy of the private key.
Any thoughts?
Regards,
Dan