Find the false statement: (A) In Modern Cryptography, symmetric key algorithms use same key both for Encryption and Decryption. (B) The Symmetric cipher DES (Data Encryption Standard) was widely used in the industry for security product. (C) The AES (Advanced Encryption Standard) cryptosystem allows variable key lengths of size 56 bits and 124 bits. (D) Public key algorithms use two different keys for Encryption and Decryption.

Find the false statement: (A) In Modern Cryptography, symmetric key algorithms use same key both for Encryption and Decryption. (B) The Symmetric cipher DES (Data Encryption Standard) was widely used in the industry for security product. (C) The AES (Advanced Encryption Standard) cryptosystem allows variable key lengths of size 56 bits and 124 bits. (D) Public key algorithms use two different keys for Encryption and Decryption.
by

1 Answer

Answer :

(C) The AES (Advanced Encryption Standard) cryptosystem allows variable key lengths of size 56 bits and 124 bits.
by

Related questions

Symmetric - key cryptography refers to ______methods in which both the sender and receiver share the same key ( or , less commonly, in which their keys are different but related in an easily computable way): a) Encryption b) Decryption c) Both of above d) None of These

Description : Symmetric - key cryptography refers to ______methods in which both the sender and receiver share the same key ( or , less commonly, in which their keys are different but related in an easily computable way): a) Encryption b) Decryption c) Both of above d) None of These

Last Answer : a) Encryption

Symmetric - key cryptography refers to ______methods in which both the sender and receiver share the same key ( or , less commonly, in which their keys are different but related in an easily computable way): a) Encryption b) Decryption c) Both of above d) None of These

Description : Symmetric - key cryptography refers to ______methods in which both the sender and receiver share the same key ( or , less commonly, in which their keys are different but related in an easily computable way): a) Encryption b) Decryption c) Both of above d) None of These

Last Answer : a) Encryption

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  

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

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 

If there are N people in the world and are using secret key encryption/decryption for privacy purpose, then number of secret keys required will be: (A) N (B) (N-1) (C) N(N-1)/2 (D) N(N+1)/2

Description : If there are N people in the world and are using secret key encryption/decryption for privacy purpose, then number of secret keys required will be: (A) N (B) (N-1) (C) N(N-1)/2 (D) N(N+1)/2

Last Answer : (C) N(N-1)/2 

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

Description : 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 ... the _____ key. a. encryption, decryption b. private, public c. encryption, public d. public, private

Last Answer : d. public, private

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 

On the upper layer of SSL, a protocol for initial authentication and transfer of encryption keys, called the ………………… A) SSL handshake protocol B) SSL authentication protocol C) SSL record protocol D) SSL cipher protocol

Description : On the upper layer of SSL, a protocol for initial authentication and transfer of encryption keys, called the ………………… A) SSL handshake protocol B) SSL authentication protocol C) SSL record protocol D) SSL cipher protocol

Last Answer : A) SSL handshake protocol

Symmetric key cryptography was the only kind of encryption publicly known until: a) July 195 b) June, 1976c) June 1988d) None of These

Description : Symmetric key cryptography was the only kind of encryption publicly known until: a) July 195 b) June, 1976 c) June 1988 d) None of These

Last Answer : b) June, 1976

Symmetric key cryptography was the only kind of encryption publicly known until: a) July 195 b) June, 1976 c) June 1988 d) None of These

Description : Symmetric key cryptography was the only kind of encryption publicly known until: a) July 195 b) June, 1976 c) June 1988 d) None of These

Last Answer : b) June, 1976

Which one is an encryption technique? a. RSA b. DES c. AES d. All of the above

Description : Which one is an encryption technique? a. RSA b. DES c. AES d. All of the above

Last Answer : d. All of the above

Which one is not an encryption technique? a. RSA b. DES c. AES d. FTP

Description : Which one is not an encryption technique? a. RSA b. DES c. AES d. FTP

Last Answer : d. FTP

Which one is not a encryption technique a. RSA b. DES c. AES d. NONE OF THE ABOVE

Description : Which one is not a encryption technique a. RSA b. DES c. AES d. NONE OF THE ABOVE

Last Answer : d. NONE OF THE ABOVE

The study of encryption is called‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ a. Decryption b. Cryptography c. Firewall d. All the above

Description : The study of encryption is called‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ a. Decryption b. Cryptography c. Firewall d. All the above

Last Answer : b. Cryptography

Public key cryptography is also known as ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐cryptography. a. Private key b. Symmetric c. Asymmetric d. None

Description : Public key cryptography is also known as ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐cryptography. a. Private key b. Symmetric c. Asymmetric d. None

Last Answer : c. Asymmetric

Private Key cryptography is also known as ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐cryptography. a. Public key b. Symmetric c. Asymmetric d. None

Description : Private Key cryptography is also known as ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐cryptography. a. Public key b. Symmetric c. Asymmetric d. None

Last Answer : b. Symmetric

What scrambles the contents of a file so you can't read it without having the right decryption key? a. Encryption b. Intrusion‐detection software c. Security‐auditing software d. All of the above

Description : What scrambles the contents of a file so you can't read it without having the right decryption key? a. Encryption b. Intrusion‐detection software c. Security‐auditing software d. All of the above

Last Answer : a. Encryption

How many distinct stages are there in DES algorithm, which is parameterized by a 56-bit key ? (A) 16 (B) 17 (C) 18 (D) 19

Description : How many distinct stages are there in DES algorithm, which is parameterized by a 56-bit key ? (A) 16 (B) 17 (C) 18 (D) 19

Last Answer : (D) 19

What is an encryption system that uses two keys: a public key that everyone can have and a private key for only the recipient? a. Encryption b. Public key encryption c. Intrusion‐detection software d. Security‐auditing software

Description : What is an encryption system that uses two keys: a public key that everyone can have and a private key for only the recipient? a. Encryption b. Public key encryption c. Intrusion‐detection software d. Security‐auditing software

Last Answer : b. Public key encryption

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.

Description : 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 ... him. c. which uses the RSA coding system. d. which is a standard for use in e-Commerce.  

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

Description : 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 d. sends both message and hashed message using public key encryption

Last Answer : a. sends message key using public key encryption using DES and hashed message using public key encryption  

Encryption and Decryption is the responsibility of ............... Layer. (A) Physical (B) Network (C) Application (D) Datalink

Description : Encryption and Decryption is the responsibility of ............... Layer. (A) Physical (B) Network (C) Application (D) Datalink

Last Answer : (C) Application

Consider a disk queue with request for input/output to block on cylinders 98, 183, 37, 122, 14, 124, 65, 67 in that order. Assume that disk head is initially positioned at cylinder 53 and moving towards cylinder number 0. The total number of head movements using Shortest Seek Time First (SSTF) and SCAN algorithms are respectively (A) 236 and 252 cylinders (B) 640 and 236 cylinders (C) 235 and 640 cylinders (D) 235 and 252 cylinders

Description : Consider a disk queue with request for input/output to block on cylinders  98, 183, 37, 122, 14, 124, 65, 67  in that order. Assume that disk head is initially positioned at cylinder 53 and moving ... and 252 cylinders (B) 640 and 236 cylinders (C) 235 and 640 cylinders (D) 235 and 252 cylinders

Last Answer : Answer: 236 and 208 cylinders Explanation: SSTF Initial head position =53 The closest queue to initial head position=65 head moves from 53 to 65=12 head moves from 65 to 67=2 head moves from 67 ... 122=24 head moves from 122 to 124=2 head moves from 124 to 183=59 Total head movement=208 

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.  

The responsibility of a certification authority for digital signature is to authenticate the a. hash function used b. private keys of subscribers c. public keys of subscribers d. key used in DES

Description : The responsibility of a certification authority for digital signature is to authenticate the a. hash function used b. private keys of subscribers c. public keys of subscribers d. key used in DES 

Last Answer : c. public keys of subscribers  

Which of the following statements is FALSE about weak entity set ? (A) Weak entities can be deleted automatically when their strong entity is deleted. (B) Weak entity set avoids the data duplication and consequent possible inconsistencies caused by duplicating the key of the strong entity. (C) A weak entity set has no primary keys unless attributes of the strong entity set on which it depends are included. (D) Tuples in a weak entity set are not partitioned according to their relationship with tuples in a strong entity set.

Description : Which of the following statements is FALSE about weak entity set ? (A) Weak entities can be deleted automatically when their strong entity is deleted. (B) Weak entity set avoids the data ... weak entity set are not partitioned according to their relationship with tuples in a strong entity set.

Last Answer : (D) Tuples in a weak entity set are not partitioned according to their relationship with tuples in a strong entity set.

Which of the following is a useful security mechanism when considering business strategy and IT? a. Encryption b. Decryption c. firewall d. all the above

Description : Which of the following is a useful security mechanism when considering business strategy and IT? a. Encryption b. Decryption c. firewall d. all the above

Last Answer : d. all the above

Which of the following is not related to security mechanism a. encryption b. decryption c. e‐cash d. all the above

Description : Which of the following is not related to security mechanism a. encryption b. decryption c. e‐cash d. all the above

Last Answer : c. e‐cash

Which of the following is a useful security mechanism when considering business strategy and IT? a. encryption b. decryption c. firewall d. all the above

Description : Which of the following is a useful security mechanism when considering business strategy and IT? a. encryption b. decryption c. firewall d. all the above

Last Answer : d. all the above

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.

Description : 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 ... algorithm once. d. Uses 128 bit blocks of plain text and 112 bit keys and apply DES algorithm thrice. 

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. 

Which one is not used as a security mechanism? a. Encryption b. Cryptography c. Wallets d. Digital signature

Description : Which one is not used as a security mechanism? a. Encryption b. Cryptography c. Wallets d. Digital signature

Last Answer : c. Wallets

When the information is reverted back into a useful form it is called: a) Standard encryption b) Plain text encryption c) Decryption d) None of These

Description : When the information is reverted back into a useful form it is called: a) Standard encryption b) Plain text encryption c) Decryption d) None of These

Last Answer : c) Decryption

When the information is reverted back into a useful form it is called: a) Standard encryption b) Plain text encryption c) Decryption d) None of These

Description : When the information is reverted back into a useful form it is called: a) Standard encryption b) Plain text encryption c) Decryption d) None of These

Last Answer : c) Decryption

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

Description : 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 ... e-Commerce a. i and ii b. ii and iii c. iii and iv d. i and iv  

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

Description : 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 ... instead of using hardware d. designing DES with high security and not publicizing algorithm used by it  

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

A message “COMPUTERNETWORK” encrypted(ignore quotes)using columnar transposition cipher with a key “LAYER”. The encrypted message is: (A) CTTOEWMROPNRUEK (B) MROUEKCTTPNROEW (C) OEWPNRCTTUEKMRO (D) UEKPNRMROOEWCTT

Description : A message “COMPUTERNETWORK” encrypted(ignore quotes)using columnar transposition cipher with a key “LAYER”. The encrypted message is: (A) CTTOEWMROPNRUEK (B) MROUEKCTTPNROEW (C) OEWPNRCTTUEKMRO (D) UEKPNRMROOEWCTT

Last Answer : (C) OEWPNRCTTUEKMRO

Encrypt the plain text Message “EXTRANET” using Transposition cipher technique with the following key: Image Using ‘Z’ as bogus character. (A) TAXERTZENZ (B) EXTRANETZZ (C) EZXZTRZANZET (D) EXTZRANZETZ

Description : Encrypt the plain text Message “EXTRANET” using Transposition cipher technique with the following key: Using ‘Z’ as bogus character. (A) TAXERTZENZ (B) EXTRANETZZ (C) EZXZTRZANZET (D) EXTZRANZETZ

Last Answer : (A) TAXERTZENZ 

The acronym DES stands for a. Digital Evaluation System b. Digital Encryption Standard c. Digital Encryption System d. Double Encryption Standard

Description : The acronym DES stands for a. Digital Evaluation System b. Digital Encryption Standard c. Digital Encryption System d. Double Encryption Standard

Last Answer : b. Digital Encryption Standard 

Encoding or scrambling data for transmission across a network is khown as a)Protection b) Detection c) Encryption d) Decryption

Description : Encoding or scrambling data for transmission across a network is khown as a)Protection b) Detection c) Encryption d) Decryption

Last Answer : c) Encryption

Encoding or scrambling data for transmission across a network is known as: (A) Decryption (B) Protection (C) Detection (D) Encryption

Description : Encoding or scrambling data for transmission across a network is known as: (A) Decryption (B) Protection (C) Detection (D) Encryption

Last Answer : (D) Encryption

Which of the following are a common means for losing encrypted data? a) lose the keys b) lose the encryption standard c) lose the account d) all of the mentioned

Description : Which of the following are a common means for losing encrypted data? a) lose the keys b) lose the encryption standard c) lose the account d) all of the mentioned

Last Answer : lose the keys

If h is chosen from a universal collection of hash functions and is used to hash n keys into a table of size m, where n ≤ m, the expected number of collisions involving a particular key K is (A) less than 1 (B) less than lg n (C) greater than 1 (D) greater than lg n

Description : If h is chosen from a universal collection of hash functions and is used to hash n keys into a table of size m, where n ≤ m, the expected number of collisions involving a particular key K is (A) less than 1 (B) less than lg n (C) greater than 1 (D) greater than lg n

Last Answer : (A) less than 1

If h is chosen from a universal collection of hash functions and is used to hash n keys into a table of size m, where n≤m, the expected number of collisions involving a particular key x is less than ................... (1) 1 (2) 1/n (3) 1/m (4) n/m

Description : If h is chosen from a universal collection of hash functions and is used to hash n keys into a table of size m, where n≤m, the expected number of collisions involving a particular key x is less than ................... (1) 1 (2) 1/n (3) 1/m (4) n/m

Last Answer : Answer: 1

At the lower layer of SSL, a protocol for transferring data using a variety of predefined cipher and authentication combinations called the ………………. A) SSL handshake protocol B) SSL authentication protocol C) SSL record protocol D) SSL cipher protocol

Description : At the lower layer of SSL, a protocol for transferring data using a variety of predefined cipher and authentication combinations called the ………………. A) SSL handshake protocol B) SSL authentication protocol C) SSL record protocol D) SSL cipher protocol

Last Answer : C) SSL record protocol

Using data p=3, q=11, n=pq, d=7 in RSA algorithm find the cipher text of the given plain text SUZANNE (A) BUTAEEZ (B) SUZANNE (C) XYZABCD (D) ABCDXYZ

Description : Using data p=3, q=11, n=pq, d=7 in RSA algorithm find the cipher text of the given plain text SUZANNE (A) BUTAEEZ (B) SUZANNE (C) XYZABCD (D) ABCDXYZ

Last Answer : (A) BUTAEEZ

When information is transformed from a useful form of understanding to an opaque form of understanding, this is called: a) Encryption b) Decryption c) Both of Above d) None of These

Description : When information is transformed from a useful form of understanding to an opaque form of understanding, this is called: a) Encryption b) Decryption c) Both of Above d) None of These

Last Answer : a) Encryption

When information is transformed from a useful form of understanding to an opaque form of understanding, this is called: a) Encryption b) Decryption c) Both of Above d) None of These

Description : When information is transformed from a useful form of understanding to an opaque form of understanding, this is called: a) Encryption b) Decryption c) Both of Above d) None of These

Last Answer : c) Both of Above