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NEW QUESTION: 1
You are the database administrator of a MySQL database server. Your network contains a
combination of new and old (pre-4.1) MySQL clients.
You are configuring a new server for testing purposes. You want to allow connections only by the clients that have new-format passwords.
Which of the following steps will you take to accomplish the task?
A. Start the server with the --old-password option.
B. Start the server with the --shared-memory option.
C. Start the server with the --secure-auth option.
D. Start the server with the --enable-named-pipe option.
Answer: C
Explanation:
According to the question, the network contains both new and old clients and you have to allow only the new clients that support new-format passwords. In order to accomplish the task, you will have to start the server with the --secure-auth option. This will cause the server to reject connection attempts from any client that has a password in the old format.
Answer D and C are incorrect. These options enable shared memory and named-pipe connection protocols, so that in a Windows server the local clients can use either of these connections to connect with the server.
Answer A is incorrect. This option will provide support for the older clients.
NEW QUESTION: 2
What is the length of an MD5 message digest?
A. 128 bits
B. varies depending upon the message size.
C. 256 bits
D. 160 bits
Answer: A
Explanation:
Explanation/Reference:
A hash algorithm (alternatively, hash "function") takes binary data, called the message, and produces a condensed representation, called the message digest. A cryptographic hash algorithm is a hash algorithm that is designed to achieve certain security properties. The Federal Information Processing Standard 180-
3, Secure Hash Standard, specifies five cryptographic hash algorithms - SHA-1, SHA-224, SHA-256, SHA-
384, and SHA-512 for federal use in the US; the standard was also widely adopted by the information technology industry and commercial companies.
The MD5 Message-Digest Algorithm is a widely used cryptographic hash function that produces a 128-bit (16-byte) hash value. Specified in RFC 1321, MD5 has been employed in a wide variety of security applications, and is also commonly used to check data integrity. MD5 was designed by Ron Rivest in 1991 to replace an earlier hash function, MD4. An MD5 hash is typically expressed as a 32-digit hexadecimal number.
However, it has since been shown that MD5 is not collision resistant; as such, MD5 is not suitable for applications like SSL certificates or digital signatures that rely on this property. In 1996, a flaw was found with the design of MD5, and while it was not a clearly fatal weakness, cryptographers began recommending the use of other algorithms, such as SHA-1 - which has since been found also to be vulnerable. In 2004, more serious flaws were discovered in MD5, making further use of the algorithm for security purposes questionable - specifically, a group of researchers described how to create a pair of files that share the same MD5 checksum. Further advances were made in breaking MD5 in 2005, 2006, and
2007. In December 2008, a group of researchers used this technique to fake SSL certificate validity, and US-CERT now says that MD5 "should be considered cryptographically broken and unsuitable for further use." and most U.S. government applications now require the SHA-2 family of hash functions.
NIST CRYPTOGRAPHIC HASH PROJECT
NIST announced a public competition in a Federal Register Notice on November 2, 2007 to develop a new cryptographic hash algorithm, called SHA-3, for standardization. The competition was NIST's response to advances made in the cryptanalysis of hash algorithms.
NIST received sixty-four entries from cryptographers around the world by October 31, 2008, and selected fifty-one first-round candidates in December 2008, fourteen second-round candidates in July 2009, and five finalists - BLAKE, Grøstl, JH, Keccak and Skein, in December 2010 to advance to the third and final round of the competition.
Throughout the competition, the cryptographic community has provided an enormous amount of feedback.
Most of the comments were sent to NIST and a public hash forum; in addition, many of the cryptanalysis and performance studies were published as papers in major cryptographic conferences or leading cryptographic journals. NIST also hosted a SHA-3 candidate conference in each round to obtain public feedback. Based on the public comments and internal review of the candidates, NIST announced Keccak as the winner of the SHA-3 Cryptographic Hash Algorithm Competition on October 2, 2012, and ended the five-year competition.
Reference:
Tipton, Harold, et. al., Officical (ISC)2 Guide to the CISSP CBK, 2007 edition, page 261.
and
https://secure.wikimedia.org/wikipedia/en/wiki/Md5
and
http://csrc.nist.gov/groups/ST/hash/sha-3/index.html
NEW QUESTION: 3
ソリューションアーキテクトは、ストレージにAmazon S3バケットを使用してドキュメントレビューアプリケーションを実装しています。ソリューションは、ドキュメントの誤った削除を防止し、ドキュメントのすべてのバージョンが利用可能であることを確認する必要があります。ユーザーはドキュメントをダウンロード、変更、アップロードできる必要があります。これらの要件を満たすためにアクションを実行する必要がありますか？ （2つ選択）
A. 1AMポリシーをバケットにアタッチします
B. バケットでMFA削除を有効にする
C. 読み取り専用バケットACLを有効にします
D. バケットのバージョニングを有効にします
E. AWS KMSを使用してバケットを暗号化します
Answer: B,D
Explanation:
Explanation
Object Versioning
Use Amazon S3 Versioning to keep multiple versions of an object in one bucket. For example, you could store my-image.jpg (version 111111) and my-image.jpg (version 222222) in a single bucket. S3 Versioning protects you from the consequences of unintended overwrites and deletions. You can also use it to archive objects so that you have access to previous versions.
To customize your data retention approach and control storage costs, use object versioning with Object lifecycle management. For information about creating S3 Lifecycle policies using the AWS Management Console, see How Do I Create a Lifecycle Policy for an S3 Bucket? in the Amazon Simple Storage Service Console User Guide.
If you have an object expiration lifecycle policy in your non-versioned bucket and you want to maintain the same permanent delete behavior when you enable versioning, you must add a noncurrent expiration policy.
The noncurrent expiration lifecycle policy will manage the deletes of the noncurrent object versions in the version-enabled bucket. (A version-enabled bucket maintains one current and zero or more noncurrent object versions.) You must explicitly enable S3 Versioning on your bucket. By default, S3 Versioning is disabled. Regardless of whether you have enabled Versioning, each object in your bucket has a version ID. If you have not enabled Versioning, Amazon S3 sets the value of the version ID to null. If S3 Versioning is enabled, Amazon S3 assigns a version ID value for the object. This value distinguishes it from other versions of the same key.
Enabling and suspending versioning is done at the bucket level. When you enable versioning on an existing bucket, objects that are already stored in the bucket are unchanged. The version IDs (null), contents, and permissions remain the same. After you enable S3 Versioning for a bucket, each object that is added to the bucket gets a version ID, which distinguishes it from other versions of the same key.
Only Amazon S3 generates version IDs, and they can't be edited. Version IDs are Unicode, UTF-8 encoded, URL-ready, opaque strings that are no more than 1,024 bytes long. The following is an example:
3/L4kqtJlcpXroDTDmJ+rmSpXd3dIbrHY+MTRCxf3vjVBH40Nr8X8gdRQBpUMLUo.
Using MFA delete
If a bucket's versioning configuration is MFA Delete-enabled, the bucket owner must include the x-amz-mfa request header in requests to permanently delete an object version or change the versioning state of the bucket.
Requests that include x-amz-mfa must use HTTPS. The header's value is the concatenation of your authentication device's serial number, a space, and the authentication code displayed on it. If you do not include this request header, the request fails.
https://docs.aws.amazon.com/AmazonS3/latest/dev/ObjectVersioning.html
https://docs.aws.amazon.com/AmazonS3/latest/dev/UsingMFADelete.html