Answer (A) is correct . RSA is a potential encryption standard licensed to hardware and software vendors. Public-key encryption requires management of fewer keys for a given client-server environment than does private-key encryption. However, compared with DES, RSA entails more complex computations and therefore has a higher processing overhead. RSA requires two keys:? The public key for encrypting messages is widely known, but the private key for decrypting messages is kept secret by the recipient.
Answer (B) is incorrect because DES is a shared private-key method developed by the U.S. government. It encrypts data into 64-bit blocks using a 56-bit key. DES requires only a single key for each pair of parties that want to send each other encrypted messages.
Answer (C) is incorrect because A modem is used for telecommunications.
Answer (D) is incorrect because A cypher lock is a physical device.
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