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NEW QUESTION: 1
Which of the following is the process of digitally signing executables and scripts to confirm the software author and guarantee that the code has not been altered or corrupted since it was signed by use of a cryptographic hash?
A. Hashing
B. Non-repudiation
C. Entropy
D. Code signing
Answer: D
Explanation:
Code signing is the process of digitally signing executables and scripts to confirm the software author and guarantee that the code has not been altered or corrupted since it was signed by use of a cryptographic hash.
Overview Code signing can provide several valuable features. The most common use of code signing is to provide security when deploying: in some languages, it can also be used to help prevent namespace conflicts. Almost every code signing implementation will provide some sort of digital signature mechanism to verify the identity of the author or build system, and a checksum to verify that the object has not been modified. It can also be used to provide versioning information about an object or to store other meta data about an object.
Providing security Many code signing implementations will provide a way to sign the code using private and public key systems, similar to the process employed by SSL or SSH. For example, in the case of .NET, the developer uses a key to sign his libraries or executables each time he builds. This key will be unique to a developer or group or sometimes per application or object. The developer can either generate this key on his own or obtain one from a trusted certificate authority (CA).
It is particularly valuable in distributed environments, where the source of a given piece of code may not be immediately evident - for example Java applets. ActiveX controls and other active web and browser scripting code. Another major usage is to safely provide updates and patches to existing software. Most Linux distributions, as well as both Apple Mac OS X and Microsoft Windows update services use code signing to ensure that it is not possible to maliciously distribute code via the patch system. It allows them to not have to worry about distribution security, such as mirror sites which may not be under the authors complete control, or any other intermediate piece of the deployment.
Trusted identification using a certificate authority (CA) The public key used for code signing should be traceable back to a trusted root authority, preferably using a secure public key infrastructure (PKI). This does not ensure that the code itself can be trusted, only that it comes from the stated source or more explicitly, from a particular private key. A certificate authority provides a root trust level which is able to assign trust to others by proxy. If a user is set to trust one of these certificate authorities and receives an executable signed with a key generated by that CA. he can choose to trust the executable by proxy. In many frameworks and operating systems, a number of existing publicly trusted authorities will be pre-installed such as Version, TC TrustCenter, COMOOO, GoDaddy and GlobalSign. When inside a large group of users, such as a large company, it is commonplace to employ a private internal certificate authority suitable for providing the same features of public certificate authority but for deploying signed objects internally.
Alternative to CAs The other model is where developers can choose to provide their own self-generated key. In this scenario, the user would normally have to obtain the public key in some fashion directly from the developer to verify the object is from him for the first time. Many code signing systems will store the public key inside the signature. Some software frameworks and OSs that check the codes signature before executing will allow you to choose to trust that developer from that point on after the first run. An application developer can provide a similar system by including the public keys with the installer. The key can then be used to ensure that any subsequent objects that need to run, such as upgrades, plugins, or another application, are all verified as coming from that same developer.
Problems Like any security measure, code signing can be defeated. Users can be tricked into running unsigned code, or even into running code that refuses to validate, and the system only remains secure as long as the private key remains private. It is also important to note that code signing does not protect the end user from any malicious activity or unintentional software bugs by the software author - it merely ensures that the software has not been modified by anyone other than the author.
Implementations IBM's Lotus Notes has had PKI signing of code from Release 1 - and both client and server software have execution control lists to control what levels of access to data, environment and file system are permitted for given users, individual design elements, including active items such as scripts, actions and agents, are always signed using the editors ID file, which includes both the editor's and the domain's public keys. Core templates such as the mail template are signed with a dedicated ID held by the Lotus template development team.
Signed JavaScript is also popular: signed scripts are allowed to perform additional actions such as cross-domain referencing.
Microsoft implements a form of code signing based on Authenticode provided for Microsoft tested drivers. Since drivers run in the kernel, they can destabilize the system or open the system to security holes. For this reason. Microsoft tests drivers submitted to its WHQL program. After the driver has passed, Microsoft signs that version of the driver as being safe. On 32-bit systems only, installing drivers that are not validated with Microsoft is possible after accepting to allow the installation in a prompt warning the user that the code is unsigned. For .NET managed code, there is an additional mechanism called Strong Name Signing that uses Public/Private keys and SHA1 hash as opposed to Certificates. However, Microsoft discourages reliance on Strong Name Signing as a replacement for Authenticode
Answer options A, B and D are incorrect. These are not valid options.

NEW QUESTION: 2
You have a database that stores sales and order information.
Users must be able to extract information from the tables on an ad hoc basis. They must also be able to reference the extracted information as a single table.
You need to implement a solution that allows users to retrieve the data required, based on variables defined at the time of the query.
What should you implement?
A. a table-valued function
B. a stored procedure
C. the TRY PARSE function
D. the TRY CONVERT function
E. the COALESCE function
F. the ISNULL function
G. a view
H. a scalar function
Answer: A

NEW QUESTION: 3
Which capabilities are not supported in DCNM device manager?
A. configure FCoE
B. save and copy configuration files and software images
C. manage SNMPv3 security access to switches
D. configure VLANs and Ethernet port channels
E. manage 2148T FEX, 2232PP FEX, and 2248TP FEX
Answer: D
Explanation:
Explanation/Reference:
Explanation:

NEW QUESTION: 4
A company is deploying a new VoIP phone system. They require 99.999% uptime for their phone service and are concerned about their existing data network interfering with the VoIP phone system. The core switches in the existing data network are almost fully saturated. Which of the following options will pro-vide the best performance and availability for both the VoIP traffic, as well as the traffic on the existing data network?
A. Physically separate the VoIP phones from the data network
B. Upgrade the edge switches from 10/100/1000 to improve network speed
C. Implement flood guards on the data network
D. Put the VoIP network into a different VLAN than the existing data network.
Answer: D