In public key encryption system if A encrypts a message using his private key and sends it to B a. if B knows it is from A he can decrypt it using A’s public key b. Even if B knows who sent the message it cannot be decrypted c. It cannot be decrypted at all as no one knows A’s private key d. A should send his public key with the message

In public key encryption system if A encrypts a message using his private key and sends it to B a. if B knows it is from A he can decrypt it using A’s public key b. Even if B knows who sent the message it cannot be decrypted c. It cannot be decrypted at all as no one knows A’s private key d. A should send his public key with the message
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Answer :

a. if B knows it is from A he can decrypt it using A’s public key 
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In public key encryption if A wants to send an encrypted message a. A encrypts message using his private key b. A encrypts message using B’s private key c. A encrypts message using B’s public key d. A encrypts message using his public key

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Last Answer : c. A encrypts message using B’s public key 

Public key encryption method is a system a. which uses a set of public keys one for each participant in e-Commerce b. in which each person who wants to communicate has two keys; a private key known to him only and a public key which is publicized to enable others to send message to him. c. which uses the RSA coding system. d. which is a standard for use in e-Commerce.

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Last Answer : b. in which each person who wants to communicate has two keys; a private key known to him only and a public key which is publicized to enable others to send message to him.

While sending a signed message, a sender a. sends message key using public key encryption using DES and hashed message using public key encryption b. sends message using public key encryption and hashed message using DES c. sends both message and hashed message using DES d. sends both message and hashed message using public key encryption

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Hashed message is signed by a sender using a. his public key b. his private key c. receiver’s public key d. receiver’s private key

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Last Answer : b. guarantees excellent security  

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Public key encryption uses multiple keys. One key is used to encrypt data, while another is used to decrypt data. The key used to encrypt data is called the _____ key, while the key used to decrypt data is called the _____ key. a. encryption, decryption b. private, public c. encryption, public d. public, private

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Certification of Digital signature by an independent authority is needed because a. it is safe b. it gives confidence to a business c. the authority checks and assures customers that the public key indeed belongs to the business which claims its ownership d. private key claimed by a sender may not be actually his

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Encryption can be done a. only on textual data b. only on ASCII coded data c. on any bit string d. only on mnemonic data

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Last Answer : b. i, ii, iii 

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Last Answer : b. a customer buys several electronic coins which are digitally signed by coin issuing bank 

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Triple DES uses a. 168 bit keys on 64-bit blocks of plain text b. Working on 64-bit blocks of plain text and 56 bit keys by applying DES algorithm for three rounds. c. Works with 144 bit blocks of plain text and applies DES algorithm once. d. Uses 128 bit blocks of plain text and 112 bit keys and apply DES algorithm thrice.

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A hardened firewall host on an Intranet is a. a software which runs in any of the computers in the intranet b. a software which runs on a special reserved computer on the intranet c. a stripped down computer connected to the intranet d. a mainframe connected to the intranet to ensure security

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Firewall as part of a router program a. filters only packets coming from internet b. filters only packets going to internet c. filters packets travelling from and to the intranet from the internet d. ensures rapid traffic of packets for speedy e-Commerce

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Last Answer : c. filters packets travelling from and to the intranet from the internet