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NEW QUESTION 53 Which of the following is a protocol for exchanging keys?

• A. RSA
• B. DH
• C. EC
• D. AES

Answer: B Explanation: DH https://en.wikipedia.org/wiki/Diffie%E2%80%93Hellmankeyexchange Diffie-Hellman key exchange is a method of securely exchanging cryptographic keys over a public channel and was one of the first public-key protocols as conceived by Ralph Merkle and named after Whitfield Diffie and Martin Hellman. DH is one of the earliest practical examples of public key exchange implemented within the field of cryptography. Published in 1976 by Diffie and Hellman, this is the earliest publicly known work that proposed the idea of a private key and a corresponding public key. Incorrect answers: EC - Elliptic-curve cryptography (ECC) is an approach to public-key cryptography based on the algebraic structure of elliptic curves over finite fields. ECC allows smaller keys compared to non-EC cryptography (based on plain Galois fields) to provide equivalent security. RSA - (Rivest-Shamir-Adleman) is a public-key cryptosystem that is widely used for secure data transmission. It is also one of the oldest. The acronym RSA comes from the surnames of Ron Rivest, Adi Shamir, and Leonard Adleman, who publicly described the algorithm in 1977. An equivalent system was developed secretly, in 1973 at GCHQ (the British signals intelligence agency), by the English mathematician Clifford Cocks. That system was declassified in 1997. AES - also known by its original name Rijndael, is a specification for the encryption of electronic data established by the U.S. National Institute of Standards and Technology (NIST) in 2001. AES is a subset of the Rijndael block cipher developed by two Belgian cryptographers, Vincent Rijmen and Joan Daemen, who submitted a proposal[5] to NIST during the AES selection process. Rijndael is a family of ciphers with different key and block sizes. For AES, NIST selected three members of the Rijndael family, each with a block size of 128 bits, but three different key lengths: 128, 192 and 256 bits.   NEW QUESTION 54 John is going to use RSA to encrypt a message to Joan. What key should he use?

• A. A shared key
• B. Joan's private key
• C. A random key
• D. Joan's public key

Answer: D Explanation: Joan's public key https://en.wikipedia.org/wiki/RSA_(cryptosystem) Suppose Joahn uses Bob's public key to send him an encrypted message. In the message, she can claim to be Alice but Bob has no way of verifying that the message was actually from Alice since anyone can use Bob's public key to send him encrypted messages. In order to verify the origin of a message, RSA can also be used to sign a message. Suppose Alice wishes to send a signed message to Bob. She can use her own private key to do so. She produces a hash value of the message, raises it to the power of d (modulo n) (as she does when decrypting a message), and attaches it as a "signature" to the message. When Bob receives the signed message, he uses the same hash algorithm in conjunction with Alice's public key. He raises the signature to the power of e (modulo n) (as he does when encrypting a message), and compares the resulting hash value with the message's actual hash value. If the two agree, he knows that the author of the message was in possession of Alice's private key, and that the message has not been tampered with since.   NEW QUESTION 55 Which one of the following is an authentication method that sends the username and password in cleartext?

• A. SPAP
• B. CHAP
• C. PAP
• D. Kerberos

Answer: C Explanation: PAP https://en.wikipedia.org/wiki/PasswordAuthenticationProtocol Password Authentication Protocol (PAP) is a password-based authentication protocol used by Point to Point Protocol (PPP) to validate users. Almost all network operating system remote servers support PAP. PAP is specified in RFC 1334. PAP is considered a weak authentication scheme (weak schemes are simple and have lighter computational overhead but are much more vulnerable to attack; while weak schemes may have limited application in some constrained environments, they are avoided in general). Among PAP's deficiencies is the fact that it transmits unencrypted passwords (i.e. in plain-text) over the network. PAP is therefore used only as a last resort when the remote server does not support a stronger scheme such as CHAP or EAP. Incorrect answers: SPAP - Shiva Password Authentication Protocol, PAP with encryption for the usernames/passwords that are transmitted. CHAP - calculates a hash, shares the hash with the client system, the hash is periodically validated to ensure nothing has changed. Kerberos - computer-network authentication protocol that works on the basis of tickets to allow nodes communicating over a non-secure network to prove their identity to one another in a secure manner. Its designers aimed it primarily at a client-server model and it provides mutual authentication-both the user and the server verify each other's identity. Kerberos protocol messages are protected against eavesdropping and replay attacks. Kerberos builds on symmetric key cryptography and requires a trusted third party, and optionally may use public-key cryptography during certain phases of authentication.   NEW QUESTION 56 A disk you rotated to encrypt/decrypt. Created by Leon Alberti. Similar technologies were used in the Enigma machine. Considered the forefather of modern encryption.

• A. Enigma Machine
• B. Chi Square
• C. Scytale Cipher
• D. Cipher Disks

Answer: D Explanation: Cipher disks https://en.wikipedia.org/wiki/Cipher_disk A cipher disk is an enciphering and deciphering tool developed in 1470 by the Italian architect and author Leon Battista Alberti. He constructed a device, (eponymously called the Alberti cipher disk) consisting of two concentric circular plates mounted one on top of the other. The larger plate is called the "stationary" and the smaller one the "moveable" since the smaller one could move on top of the "stationary".   NEW QUESTION 57 John is trying to explain the basics of cryptography to a group of young, novice, security students. Which one of the following most accurately defines encryption?

• A. Applying keys to a message to conceal it
• B. Complex mathematics to conceal a message
• C. Changing a message using complex mathematics
• D. Changing a message so it can only be easily read by the intended recipient

Answer: D Explanation: Changing a message so it can only be easily read by the intended recipient https://en.wikipedia.org/wiki/Encryption Encryption is the process of encoding information. This process converts the original representation of the information, known as plaintext, into an alternative form known as ciphertext. Ideally, only authorized parties can decipher a ciphertext back to plaintext and access the original information. Encryption does not itself prevent interference but denies the intelligible content to a would-be interceptor.   NEW QUESTION 58 ......