Question 1

The procedure to add bits to the last block is termed as
A)decryption
B)hashing
C)tuning
D)padding

Accepted Answer

The procedure to add bits to the last block to ensure it is of a certain size or to enhance security during data transmission is known as padding. This is commonly used in cryptographic processes to align data to a specific block size required by the encryption algorithm.

Question 2

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

Accepted Answer

Cryptanalysis is the study of analyzing information systems to understand the hidden aspects of the systems. It is primarily used to find vulnerabilities or insecurities in cryptographic schemes, not to increase speed, encrypt data, or make new ciphers.

Question 3

Conventional cryptography is also known as or symmetric-key encryption.
A)secret-key
B)public key
C)protected key
D)primary key

Accepted Answer

Conventional cryptography is synonymous with symmetric-key encryption, where the same key is used for both encryption and decryption, hence the term "secret-key" is appropriate.

Question 4

__________________________________________is the art & science of cracking the cipher-text without knowing the key.
A)cracking
B)cryptanalysis
C)cryptography
D)crypto-hacking

Accepted Answer

Cryptanalysis is the discipline that deals with studying and finding methods to break ciphers and cryptographic algorithms, typically without access to the secret key.

Question 5

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

Accepted Answer

A cipher is an algorithm used for performing encryption and decryption.

Question 6

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

Accepted Answer

In asymmetric key cryptography, the private key is kept by the receiver to decrypt messages that have been encrypted with the corresponding public key.

Question 7

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

Accepted Answer

Transpositional ciphers work by rearranging the order of the letters in a message, unlike substitution ciphers, which replace each letter with another letter or symbol.

Question 8

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

Accepted Answer

Cryptanalysis is the study of analyzing information systems to understand the hidden aspects of the systems. It is primarily used to find vulnerabilities or insecurities in cryptographic schemes, not to encrypt data, increase speed, or make new ciphers.

Question 9

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

Accepted Answer

Transport Layer Security (TLS) is the cryptographic protocol designed to provide communications security over a computer network, including securing HTTP connections.

Question 10

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

Accepted Answer

The A5/2 cipher is one of the encryption algorithms used in GSM to provide voice privacy by encrypting voice channels.

Question 11

ElGamal encryption system is __________
A)symmetric key encryption algorithm
B)asymmetric key encryption algorithm
C)not an encryption algorithm
D)block cipher method

Accepted Answer

ElGamal encryption system is an asymmetric key encryption algorithm, meaning it uses different keys for encryption and decryption, typically a public key for encryption and a private key for decryption.

Question 12

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

Accepted Answer

Cryptographic hash functions are designed to take an input (or 'message') and produce a fixed-size string of bytes, typically a digest that is unique to each unique input.

Question 13

In terms of Web Security Threats, "Impersonation of another user" is a Passive Attack.

Accepted Answer

"Impersonation of another user" is considered an active attack because it involves an attacker actively attempting to masquerade as another user to gain unauthorized access to information or systems. Passive attacks, in contrast, involve monitoring or eavesdropping on communications without altering the content or interfering with the system.

Question 14

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

Accepted Answer

The SSL (Secure Sockets Layer) protocol suite includes various protocols for securing communications over a network. Among the listed options, the "alarm protocol" is not a part of the SSL protocol suite. The correct protocols are the alert protocol, handshake protocol, and change cipher spec protocol, which are used for signaling alerts, establishing session details, and signaling changes in encryption, respectively.

Question 15

In the SSL Protocol, each upper layer message if fragmented into a maximum of __________ bytes.
A)216
B)232
C)214
D)212

Accepted Answer

In the SSL Protocol, each upper layer message is fragmented into a maximum of 2^14 bytes, which is 16384 bytes.

Question 16

The full form of SSL is
A)serial session layer
B)secure socket layer
C)session secure layer
D)series socket layer

Accepted Answer

The full form of SSL is Secure Socket Layer, which is a standard security technology for establishing an encrypted link between a server and a client—typically a web server (website) and a browser, or a mail server and a mail client.

Question 17

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

Accepted Answer

The Alert Protocol is used in SSL/TLS to convey alerts to the peer entity. It is responsible for handling any errors or issues that arise during the SSL communication, including notification of warnings and fatal errors.

Question 18

Which protocol consists of only 1 bit?
A)alert protocol
B)handshake protocol
C)upper-layer protocol
D)change cipher spec protocol

Accepted Answer

The Change Cipher Spec protocol in SSL/TLS is designed to signal transitions in ciphering strategies, and it consists of a single message, which is just 1 byte (or bit in the context of the question) long, indicating that the sender will start using new ciphering strategies from that point forward.

Question 19

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

Accepted Answer

The Change Cipher Spec protocol is used in SSL/TLS to signal transitions in ciphering strategies, essentially marking the point at which the pending state is copied into the current state. This is part of the process to ensure that both parties have agreed upon the encryption parameters and are ready to begin secure communication.

Question 20

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

Accepted Answer

In the alert protocol, the first byte taking the value of 1 corresponds to a warning, while a value of 2 corresponds to a fatal alert. This is used to indicate the severity of the alert being issued.

Quiz 11: Cryptography and Cryptographic Protocols

The procedure to add bits to the last block is termed as

Cryptanalysis is used ______________

Conventional cryptography is also known as or symmetric-key encryption.

__________________________________________is the art & science of cracking the cipher-text without knowing the key.

In cryptography, what is cipher?

In asymmetric key cryptography, the private key is kept by __________

In cryptography, the order of the letters in a message is rearranged by __________

Cryptanalysis is used __________

Which one of the following is a cryptographic protocol used to secure HTTP connection?

Voice privacy in GSM cellular telephone protocol is provided by _______

ElGamal encryption system is __________

Cryptographic hash function takes an arbitrary block of data and returns _________

In terms of Web Security Threats, "Impersonation of another user" is a Passive Attack.

Which one of the following is not a higher -layer SSL protocol?

In the SSL Protocol, each upper layer message if fragmented into a maximum of __________ bytes.

The full form of SSL is

Which protocol is used to convey SSL related alerts to the peer entity?

Which protocol consists of only 1 bit?

Which protocol is used for the purpose of copying the pending state into the current state?

In the alert protocol the first byte takes the value 1 or 2 which corresponds to _ and _ respectively.