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NEW QUESTION: 1
What can be defined as a value computed with a cryptographic algorithm and appended to a data object in such a way that any recipient of the data can use the signature to verify the data's origin and integrity?
A. A digital signature
B. A Message Authentication Code
C. A cryptographic hash
D. A digital envelope
Answer: A
Explanation:
Explanation/Reference:
RFC 2828 (Internet Security Glossary) defines a digital signature as a value computed with a cryptographic algorithm and appended to a data object in such a way that any recipient of the data can use the signature to verify the data's origin and integrity.
The steps to create a Digital Signature are very simple:
1. You create a Message Digest of the message you wish to send
2. You encrypt the message digest using your Private Key which is the action of Signing
3. You send the Message along with the Digital Signature to the recipient To validate the Digital Signature the recipient will make use of the sender Public Key. Here are the steps:
1. The receiver will decrypt the Digital Signature using the sender Publick Key producing a clear text message digest.
2. The receiver will produce his own message digest of the message received.
3. At this point the receiver will compare the two message digest (the one sent and the one produce by the receiver), if the two matches, it proves the authenticity of the message and it confirms that the message was not modified in transit validating the integrity as well. Digital Signatures provides for Authenticity and Integrity only. There is no confidentiality in place, if you wish to get confidentiality it would be needed for the sender to encrypt everything with the receiver public key as a last step before sending the message.
A Digital Envelope is a combination of encrypted data and its encryption key in an encrypted form that has been prepared for use of the recipient. In simple term it is a type of security that uses two layers of encryption to protect a message. First, the message itself is encoded using symmetric encryption, and then the key to decode the message is encrypted using public-key encryption. This technique overcomes one of the problems of public-key encryption, which is that it is slower than symmetric encryption. Because only the key is protected with public-key encryption, there is very little overhead.
A cryptographic hash is the result of a cryptographic hash function such as MD5, SHA-1, or SHA-2. A hash value also called a Message Digest is like a fingerprint of a message. It is used to proves integrity and ensure the message was not changed either in transit or in storage.
A Message Authentication Code (MAC) refers to an ANSI standard for a checksum that is computed with a keyed hash that is based on DES or it can also be produced without using DES by concataning the Secret Key at the end of the message (simply adding it at the end of the message) being sent and then producing a Message digest of the Message+Secret Key together. The MAC is then attached and sent along with the message but the Secret Key is NEVER sent in clear text over the network.
In cryptography, HMAC (Hash-based Message Authentication Code), is a specific construction for calculating a message authentication code (MAC) involving a cryptographic hash function in combination with a secret key. As with any MAC, it may be used to simultaneously verify both the data integrity and the authenticity of a message. Any cryptographic hash function, such as MD5 or SHA-1, may be used in the calculation of an HMAC; the resulting MAC algorithm is termed HMAC-MD5 or HMAC-SHA1 accordingly.
The cryptographic strength of the HMAC depends upon the cryptographic strength of the underlying hash function, the size of its hash output length in bits and on the size and quality of the cryptographic key.
There is more than one type of MAC: Meet CBC-MAC
In cryptography, a Cipher Block Chaining Message Authentication Code, abbreviated CBC-MAC, is a technique for constructing a message authentication code from a block cipher. The message is encrypted with some block cipher algorithm in CBC mode to create a chain of blocks such that each block depends on the proper encryption of the previous block. This interdependence ensures that a change to any of the plaintext bits will cause the final encrypted block to change in a way that cannot be predicted or counteracted without knowing the key to the block cipher.
References:
SHIREY, Robert W., RFC2828: Internet Security Glossary, may 2000.
and
http://www.webopedia.com/TERM/D/digital_envelope.html
and
http://en.wikipedia.org/wiki/CBC-MAC

NEW QUESTION: 2
Refer to the exhibit. Which description of a User Agent Server that sends this message this message is true?

A. It is not possible for the UAS to send this message.
B. The UAS sends this message in response to an earlier INVITE received.
C. The UAS sends this message in response to an earlier PRACK received.
D. The UAS sends this single message in response to an earlier INVITE that contains PRACK.
E. The UAS sends this message in response to an earlier ACK received.
Answer: C

NEW QUESTION: 3
Most cases of insider abuse can be traced to individuals who are introverted, incapable of dealing with stress or conflict, and frustrated with their job, office politics, and lack of respect or promotion. Disgruntled employees may pass company secrets and intellectual property to competitors for monitory benefits.
Here are some of the symptoms of a disgruntled employee:
a. Frequently leaves work early, arrive late or call in sick
b. Spends time surfing the Internet or on the phone
c. Responds in a confrontational, angry, or overly aggressive way to simple requests or comments d. Always negative; finds fault with everything These disgruntled employees are the biggest threat to enterprise security. How do you deal with these threats? (Select 2 answers)
A. By implementing Virtualization technology from the desktop to the data centre, organizations can isolate different environments with varying levels of access and security to various employees
B. Limit Internet access, e-mail communications, access to social networking sites and job hunting portals
C. Limit access to the applications they can run on their desktop computers and enforce strict work hour rules
D. Organizations must ensure that their corporate data is centrally managed and delivered to users just and when needed
Answer: A,D