ANSI X.12 is a standard developed by a. American National Standard Institute b. International Standard Institute c. European Common Market d. United Nations Economic Commission for Europe

ANSI X.12 is a standard developed by

a. American National Standard Institute

b. International Standard Institute

c. European Common Market

d. United Nations Economic Commission for Europe
by

1 Answer

Answer :

a. American National Standard Institute 
by

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Last Answer : b. i, ii, iii

A digital signature is a. a bit string giving identity of a correspondent b. a unique identification of a sender c. an authentication of an electronic record by tying it uniquely to a key only a sender knows d. an encrypted signature of a sender

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Last Answer : c. an authentication of an electronic record by tying it uniquely to a key only a sender knows

DES and public key algorithm are combined (i) to speed up encrypted message transmission (ii)to ensure higher security by using different key for each transmission (iii) as a combination is always better than individual system (iv) as it is required in e-Commerce a. i and ii b. ii and iii c. iii and iv d. i and iv

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Last Answer : a. i and ii

Message can be sent more securely using DES by a. encrypting plain text by a different randomly selected key for each transmission b. encrypting plain text by a different random key for each message transmission and sending the key to the receiver using a public key system c. using an algorithm to implement DES instead of using hardware d. designing DES with high security and not publicizing algorithm used by it

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Last Answer : b. encrypting plain text by a different random key for each message transmission and sending the key to the receiver using a public key system

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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Last Answer : a. if B knows it is from A he can decrypt it using A’s public key 

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 system is useful because a. it uses two keys. b. there is no key distribution problem as public key can be kept in a commonly accessible database. c. private key can be kept secret. d. it is a symmetric key system.

Description : Public key system is useful because a. it uses two keys. b. there is no key distribution problem as public key can be kept in a commonly accessible database. c. private key can be kept secret. d. it is a symmetric key system. 

Last Answer : b. there is no key distribution problem as public key can be kept in a commonly accessible database.  

Triple DES a. is a symmetric key encryption method b. guarantees excellent security c. is implementable as a hardware VLSI chip d. is public key encryption method with three keys.

Description : Triple DES a. is a symmetric key encryption method b. guarantees excellent security c. is implementable as a hardware VLSI chip d. is public key encryption method with three keys. 

Last Answer : b. guarantees excellent security  

ripple DES a. Cannot be broken in reasonable time using presently available computers. b. Can be broken only if the algorithm is known using even slow computer. c. Can be broken with presently available high performance computers. d. It is impossible to break ever.

Description : ripple DES a. Cannot be broken in reasonable time using presently available computers. b. Can be broken only if the algorithm is known using even slow computer. c. Can be broken with presently available high performance computers. d. It is impossible to break ever. 

Last Answer : a. Cannot be broken in reasonable time using presently available computers.  

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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Last Answer : b. Working on 64-bit blocks of plain text and 56 bit keys by applying DES algorithm for three rounds. 

DES using 56 bit keys a. Cannot be broken in reasonable time using presently available computers b. Can be broken only if the algorithm is known using even slow computers. c. Can be broken with presently available high performance computers. d. It is impossible to break ever.

Description : DES using 56 bit keys a. Cannot be broken in reasonable time using presently available computers b. Can be broken only if the algorithm is known using even slow computers. c. Can be broken with presently available high performance computers. d. It is impossible to break ever.

Last Answer : c. Can be broken with presently available high performance computers. 

DES (i) is a symmetric key encryption method (ii)guarantees absolute security (iii) is implementable as hardware VLSI chip (iv) is a public key encryption method a. i and ii b. ii and iii c. i and iii d. iii and iv

Description : DES (i) is a symmetric key encryption method (ii)guarantees absolute security (iii) is implementable as hardware VLSI chip (iv) is a public key encryption method a. i and ii b. ii and iii c. i and iii d. iii and iv

Last Answer : c. i and iii 

DES works by using a. permutation and substitution on 64 bit blocks of plain text b. only permutations on blocks of 128 bits c. exclusive ORing key bits with 64 bit blocks d. 4 rounds of substitution on 64 bit blocks with 56 bit keys

Description : DES works by using a. permutation and substitution on 64 bit blocks of plain text b. only permutations on blocks of 128 bits c. exclusive ORing key bits with 64 bit blocks d. 4 rounds of substitution on 64 bit blocks with 56 bit keys

Last Answer : a. permutation and substitution on 64 bit blocks of plain text 

By symmetric key encryption we mean a. one private key is used for both encryption and decryption b. private and public key used are symmetric c. only public keys are used for encryption d. only symmetric key is used for encryption

Description : By symmetric key encryption we mean a. one private key is used for both encryption and decryption b. private and public key used are symmetric c. only public keys are used for encryption d. only symmetric key is used for encryption

Last Answer : D

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 : c. on any bit string 

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Last Answer : d. i and iv 

By encryption of a text we mean a. compressing it b. expanding it c. scrambling it to preserve its security d. hashing it

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Last Answer : c. scrambling it to preserve its security 

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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Last Answer : b. a software which runs on a special reserved computer on the intranet 

A hardened firewall host on an intranet (i) has a proxy application gateway program running on it (ii)Allows specified internet users to access specified services in the intranet (iii) Initiates all internet activities requested by clients and monitors them (iv) prevents outsiders from accessing IP addresses within the intranet a. i, ii b. i, ii, iii c. i, ii, iii, iv d. ii, iii, iv

Description : A hardened firewall host on an intranet (i) has a proxy application gateway program running on it (ii)Allows specified internet users to access specified services in the intranet (iii) Initiates all internet activities requested by clients ... ii b. i, ii, iii c. i, ii, iii, iv d. ii, iii, iv

Last Answer : c. i, ii, iii, iv 

Proxy application gateway (i) acts on behalf of all intranet users wanting to access interne securely (ii)monitors all accesses to internet and allows access to only specified IP addresses (iii) disallows use of certain protocols with security problems (iv) disallows all internet users from accessing intranet a. i, ii b. i, ii, iii c. i, ii, iii, iv d. ii, iii, iv

Description : Proxy application gateway (i) acts on behalf of all intranet users wanting to access interne securely (ii)monitors all accesses to internet and allows access to only specified IP addresses (iii) disallows use of certain protocols with ... ii b. i, ii, iii c. i, ii, iii, iv d. ii, iii, iv

Last Answer : b. i, ii, iii 

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Last Answer : b. to allow intranet users to securely use specified internet services