Digital signature is commonly used in areas where data authentication and integrity are required. It is extremely important to have signature while transferring sensitive data from one peer to other peers through network since there might be malicious applications or man-in-the-middle attacks which may alter the data along the way.Java provides some APIs to generate and verify digital signature. One important class is Signature. When generating the signature, a private key needs to be passed to initSign()When verifying the signature, a public key needs to be passed to initVerify()Java use...