Computer security, cybersecurity or information technology security is the protection of computer systems and networks from information disclosure, theft of or damage to their hardware, software, or electronic data, as well as from the disruption or misdirection of the services they provide
| 251. |
The procedure to add bits to the last block is termed as |
| A. | decryption |
| B. | hashing |
| C. | tuning |
| D. | padding |
| Answer» D. padding | |
| 252. |
Cryptanalysis is used |
| A. | to find some insecurity in a cryptographic scheme |
| B. | to increase the speed |
| C. | to encrypt the data |
| D. | to make new ciphers |
| Answer» A. to find some insecurity in a cryptographic scheme | |
| 253. |
Conventional cryptography is also known as or symmetric-key encryption. |
| A. | secret-key |
| B. | public key |
| C. | protected key |
| D. | primary key |
| Answer» A. secret-key | |
| 254. |
is the art & science of cracking the cipher-text without knowing the key. |
| A. | cracking |
| B. | cryptanalysis |
| C. | cryptography |
| D. | crypto-hacking |
| Answer» B. cryptanalysis | |
| 255. |
In cryptography, what is cipher? |
| A. | algorithm for performing encryption and decryption |
| B. | encrypted message |
| C. | both algorithm for performing encryption and decryption and encrypted message |
| D. | decrypted message |
| Answer» A. algorithm for performing encryption and decryption | |
| 256. |
In asymmetric key cryptography, the private key is kept by __________ |
| A. | sender |
| B. | receiver |
| C. | sender and receiver |
| D. | all the connected devices to the network |
| Answer» B. receiver | |
| 257. |
In cryptography, the order of the letters in a message is rearranged by __________ |
| A. | transpositional ciphers |
| B. | substitution ciphers |
| C. | both transpositional ciphers and substitution ciphers |
| D. | quadratic ciphers |
| Answer» A. transpositional ciphers | |
| 258. |
Cryptanalysis is used __________ |
| A. | to find some insecurity in a cryptographic scheme |
| B. | to increase the speed |
| C. | to encrypt the data |
| D. | to make new ciphers |
| Answer» A. to find some insecurity in a cryptographic scheme | |
| 259. |
Which one of the following is a cryptographic protocol used to secure HTTP connection? |
| A. | stream control transmission protocol (sctp) |
| B. | transport layer security (tls) |
| C. | explicit congestion notification (ecn) |
| D. | resource reservation protocol |
| Answer» B. transport layer security (tls) | |
| 260. |
Voice privacy in GSM cellular telephone protocol is provided by _______ |
| A. | a5/2 cipher |
| B. | b5/4 cipher |
| C. | b5/6 cipher |
| D. | b5/8 cipher |
| Answer» A. a5/2 cipher | |
| 261. |
ElGamal encryption system is __________ |
| A. | symmetric key encryption algorithm |
| B. | asymmetric key encryption algorithm |
| C. | not an encryption algorithm |
| D. | block cipher method |
| Answer» B. asymmetric key encryption algorithm | |
| 262. |
Cryptographic hash function takes an arbitrary block of data and returns _________ |
| A. | fixed size bit string |
| B. | variable size bit string |
| C. | both fixed size bit string and variable size bit string |
| D. | variable sized byte string |
| Answer» A. fixed size bit string | |
| 263. |
In the above figure from left to right, the correct order of the shaded levels are |
| A. | network level, application level, transport level |
| B. | application level, network level, transport level |
| C. | transport level, application level, network level |
| D. | network level, transport level, application level |
| Answer» D. network level, transport level, application level | |
| 264. |
In the above figure, which of the above shaded block is transparent to end users and applications? |
| A. | ip/ipsec |
| B. | ssl |
| C. | kerberos |
| D. | s/mime |
| Answer» A. ip/ipsec | |
| 265. |
In terms of Web Security Threats, “Impersonation of another user” is a Passive Attack. |
| A. | true |
| B. | false |
| Answer» B. false | |
| 266. |
Which one of the following is not a higher –layer SSL protocol? |
| A. | alert protocol |
| B. | handshake protocol |
| C. | alarm protocol |
| D. | change cipher spec protocol |
| Answer» C. alarm protocol | |
| 267. |
In the SSL Protocol, each upper layer message if fragmented into a maximum of __________ bytes. |
| A. | 216 |
| B. | 232 |
| C. | 214 |
| D. | 212 |
| Answer» C. 214 | |
| 268. |
The full form of SSL is |
| A. | serial session layer |
| B. | secure socket layer |
| C. | session secure layer |
| D. | series socket layer |
| Answer» B. secure socket layer | |
| 269. |
Which protocol is used to convey SSL related alerts to the peer entity? |
| A. | alert protocol |
| B. | handshake protocol |
| C. | upper-layer protocol |
| D. | change cipher spec protocol |
| Answer» A. alert protocol | |
| 270. |
Which protocol consists of only 1 bit? |
| A. | alert protocol |
| B. | handshake protocol |
| C. | upper-layer protocol |
| D. | change cipher spec protocol |
| Answer» D. change cipher spec protocol | |
| 271. |
Which protocol is used for the purpose of copying the pending state into the current state? |
| A. | alert protocol |
| B. | handshake protocol |
| C. | upper-layer protocol |
| D. | change cipher spec protocol |
| Answer» D. change cipher spec protocol | |
| 272. |
In the alert protocol the first byte takes the value 1 or 2 which corresponds to _________ and _________ respectively. |
| A. | select, alarm |
| B. | alert, alarm |
| C. | warning, alarm |
| D. | warning, fatal |
| Answer» D. warning, fatal | |
| 273. |
Pretty good privacy (PGP) security system uses |
| A. | public key cryptosystem |
| B. | private key cryptosystem |
| C. | public & private key cryptosystem |
| D. | none of the mentioned |
| Answer» C. public & private key cryptosystem | |
| 274. |
Data compression includes |
| A. | removal of redundant character |
| B. | uniform distribution of characters |
| C. | removal of redundant character & uniform distribution of characters |
| D. | none of the mentioned |
| Answer» C. removal of redundant character & uniform distribution of characters | |
| 275. |
PGP offers _____ block ciphers for message encryption. |
| A. | triple-des |
| B. | cast |
| C. | idea |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |