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NEW QUESTION: 1
古いサーバーでは、ファイルをRAIDアレイに書き込む際にパフォーマンス上の問題があります。 故障したドライブを確認した後も問題はありません。 次のうちどれをチェックする必要がありますか？
A. ハードドライブトレイ
B. 冷却システム
C. ハードドライブケーブル
D. キャッシュバッテリ
Answer: D

NEW QUESTION: 2
Employees in a large multinational organization frequently travel among various geographic locations. Which type of authorization policy BEST addresses this practice?
A. Discretionary
B. Role-based
C. Identity
D. Multilevel
Answer: C

NEW QUESTION: 3
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 digital envelope
C. A Message Authentication Code
D. A cryptographic hash
Answer: A
Explanation:
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 CBCMAC, 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

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