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NEW QUESTION 25
If Bob is using asymmetric cryptography and wants to send a message to Alice so that only she can decrypt it, what key should he use to encrypt the message?

• A. Alice's private key
• B. Bob's public key
• C. Bob's private key
• D. Alice's public key

Answer: D

Explanation:
Alice's public key
https://en.wikipedia.org/wiki/Diffie%E2%80%93Hellman_key_exchange
In asymmetric (public key) cryptography, both communicating parties (i.e. both Alice and Bob) have two keys of their own - just to be clear, that's four keys total. Each party has their own public key, which they share with the world, and their own private key which they ... well, which they keep private, of course but, more than that, which they keep as a closely guarded secret. The magic of public key cryptography is that a message encrypted with the public key can only be decrypted with the private key. Alice will encrypt her message with Bob's public key, and even though Eve knows she used Bob's public key, and even though Eve knows Bob's public key herself, she is unable to decrypt the message. Only Bob, using his secret key, can decrypt the message ... assuming he's kept it secret, of course.

NEW QUESTION 26
This is a proprietary version of PAP. Encrypts username and password as it is sent across network.

• A. S-PAP
• B. WPA2
• C. PPTP VPN
• D. Kerberos

Answer: A

Explanation:
S-PAP
Shiva Password Authentication Protocol (S-PAP) - PAP with encryption for the usernames/passwords that are transmitted.
Incorrect answers:
Kerberos - a 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.
WPA2 - (Wi-Fi Protected Access II) security certification program developed by the Wi-Fi Alliance to secure wireless computer networks. It includes mandatory support for CCMP, an AES-based encryption mode.
PPTP VPN - works at layer 2 (data link) layer of OSI model. Provides both authentication and encryption. EAP or CHAP is used to provide the authentication for PPTP. MPPE (Microsoft Point to Point Encryption) is used to encrypt the traffic. MPPE - a specific Microsoft implementation of DES. Can only use over a traditional Ethernet network.

NEW QUESTION 27
What is the formula m^e %n related to?

• A. Decrypting with RSA
• B. Encrypting with EC
• C. Encrypting with RSA
• D. Generating Mersenne primes

Answer: C

Explanation:
Encrypting with RSA
https://en.wikipedia.org/wiki/RSA_(cryptosystem)
RSA Encrypting a message m (number) with the public key (n, e) is calculated:
M' := m^e %n
Incorrect answers:
Decrypting with RSA:
M'' := m^d %n
Generation Mersenne primes:
Mn = 2^n - 1
Encrypting with Elliptic Curve (EC):
y^2 = x^3 + ax + b

NEW QUESTION 28
A _____ is a function is not reversible.

• A. Asymmetric cipher
• B. Stream cipher
• C. Hash
• D. Block Cipher

Answer: C

Explanation:
Hash
https://en.wikipedia.org/wiki/Hash_function
Hash functions are irreversible. This is actually required for them to fulfill their function of determining whether someone possesses an uncorrupted copy of the hashed data. This brings susceptibility to brute force attacks, which are quite powerful these days, particularly against MD5.

NEW QUESTION 29
This algorithm was published by the German engineering firm Seimans in 1993. It is a software based stream cipher using Lagged Fibonacci generator along with a concept borrowed from the shrinking generator ciphers.

• A. RC4
• B. Blowfish
• C. FISH
• D. Twofish

Answer: C

Explanation:
FISH
https://en.wikipedia.org/wiki/FISH_(cipher)
The FISH (FIbonacci SHrinking) stream cipher is a fast software based stream cipher using Lagged Fibonacci generators, plus a concept from the shrinking generator cipher. It was published by Siemens in 1993. FISH is quite fast in software and has a huge key length. However, in the same paper where he proposed Pike, Ross Anderson showed that FISH can be broken with just a few thousand bits of known plaintext.

NEW QUESTION 30
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