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NEW QUESTION: 1
Which of the following attacks are computer threats that try to exploit computer application vulnerabilities that are unknown to others or undisclosed to the software developer? Each correct answer represents a complete solution. Choose all that apply.
A. Zero-hour
B. Spoofing
C. Buffer overflow
D. Zero-day
Answer: A,D
Explanation:
A zero-day attack, also known as zero-hour attack, is a computer threat that tries to exploit computer application vulnerabilities which are unknown to others, undisclosed to the software vendor, or for which no security fix is available. Zero-day exploits (actual code that can use a security hole to carry out an attack) are used or shared by attackers before the software vendor knows about the vulnerability. User awareness training is the most effective technique to mitigate such attacks. Answer option C is incorrect. Spoofing is a technique that makes a transmission appear to have come from an authentic source by forging the IP address, email address, caller ID, etc. In IP spoofing, a hacker modifies packet headers by using someone else's IP address to hide his identity. However, spoofing cannot be used while surfing the Internet, chatting on-line, etc. because forging the source IP address causes the responses to be misdirected. Answer option A is incorrect. Buffer overflow is a condition in which an application receives more data than it is configured to accept. This usually occurs due to programming errors in the application. Buffer overflow can terminate or crash the application.

NEW QUESTION: 2
If a user's device is compromised, it is best practice to FIRST:
A. Capture the logs.
B. Wipe the device.
C. Lock the device.
D. Document the incident.
Answer: A

NEW QUESTION: 3
Which virtual machine technique provides zero downtime in case of a virtual machine failure?
A. Clone
B. Snapshot
C. Fault tolerance
D. Backup
Answer: C

NEW QUESTION: 4
What kind of encryption is realized in the S/MIME-standard?
A. Public key based, hybrid encryption scheme
B. Elliptic curve based encryption
C. Asymmetric encryption scheme
D. Password based encryption scheme
Answer: A
Explanation:
Explanation/Reference:
Explanation:
Secure MIME (S/MIME) is a standard for encrypting and digitally signing electronic mail and for providing secure data transmissions. S/MIME extends the MIME standard by allowing for the encryption of e-mail and attachments. The encryption and hashing algorithms can be specified by the user of the mail package, instead of having it dictated to them. S/MIME follows the Public Key Cryptography Standards (PKCS). S/ MIME provides confidentiality through encryption algorithms, integrity through hashing algorithms, authentication through the use of X.509 public key certificates, and nonrepudiation through cryptographically signed message digests.
A user that sends a message with confidential information can keep the contents private while it travels to its destination by using message encryption. For message encryption, a symmetric algorithm (DES, 3DES, or in older implementations RC2) is used to encrypt the message data. The key used for this process is a one-time bulk key generated at the email client. The recipient of the encrypted message needs the same symmetric key to decrypt the data, so the key needs to be communicated to the recipient in a secure manner. To accomplish that, an asymmetric key algorithm (RSA or Diffie-Hellman) is used to encrypt and securely exchange the symmetric key. The key used for this part of the message encryption process is the recipient's public key. When the recipient receives the encrypted message, he will use his private key to decrypt the symmetric key, which in turn is used to decrypt the message data.
As you can see, this type of message encryption uses a hybrid system, which means it uses both symmetric and asymmetric algorithms. The reason for not using the public key system to encrypt the data directly is that it requires a lot of CPU resources; symmetric encryption is much faster than asymmetric encryption. Only the content of a message is encrypted; the header of the message is not encrypted so mail gateways can read addressing information and forward the message accordingly.
Incorrect Answers:
A: The S/MIME-standard does not use asymmetric encryption to encrypt the message; for message encryption, a symmetric algorithm is used. Asymmetric encryption is used to encrypt the symmetric key.
B: The S/MIME-standard does not use a password based encryption scheme.
D: The S/MIME-standard does not use Elliptic curve based encryption.
References:
Harris, Shon, All In One CISSP Exam Guide, 6th Edition, McGraw-Hill, 2013, p. 850
http://www.techexams.net/technotes/securityplus/emailsecurity.shtml