cs609 Assigmnt 2016

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Solved  By : Tahir Siddiqui(Mani)

BC-140201235@Vu.edu.pk

As you know that file system plays a significant role to ensure integrity of data. In order to protect the data, file systems employ various access control techniques for secured access of file system operations such as deleting or modifying files. Now, you are required to identify a file system having top security features from existing file systems and briefly discuss any two prominent features which make the file system secure.

ANS

NTFS stands for "New Technology File System having top security features

NTFS (NT file system; sometimes New Technology File System) is the file system that the Windows NT operating system uses for storing and retrieving files on a hard disk. NTFS is the Windows NT equivalent of the Windows 95 file allocation table (FAT) and the OS/2 High Performance File System (HPFS). However, NTFS offers a number of improvements over FAT and HPFS in terms of performance, extendibility, and security.

The Windows NT file system (NTFS) provides a combination of performance, reliability, and compatibility not found in the FAT file system.

The NTFS file system includes security features required for file servers and high-end personal computers in a corporate environment.

The NTFS file system also supports data access control and ownership privileges that are important for the integrity of critical data. While folders shared on a Windows NT computer are assigned particular permissions, NTFS files and folders can have permissions assigned whether they are shared or not.

NTFS is the only file system on Windows NT that allows you to assign permissions to individual files.

The NTFS file system has a simple, yet very powerful design. Basically, everything on the volume is a file and everything in a file is an attribute, from the data attribute, to the security attribute, to the file name attribute. Every sector on an NTFS volume that is allocated belongs to some file. Even the file system metadata (information that describes the file system itself) is part of a file.

Features of NTFS File System

NTFS stands for "New Technology File System

The following are some of the main features of NTFS File System.

Naming Conventions

·         File names can be up to 255 characters

·         File names can contain most characters except “ / \ * | :

·         File names are not case sensitive

Security

NTFS provides file and folder security. Files and folders are safer than FAT. Security is maintained by assigning NTFS permissions to files and folders. Security is maintained at the local level and the network level. The permissions can be assigned to individual files and folders. Each file or folder in an NTFS partition has an Access Control List. It contains the users and group security identifier (SID) and the privileges granted to them.

Partition Size

The NTFS partition and file sizes are much bigger than FAT partitions and files. The maximum size of an NTFS partition or file can be 16 Exabyte. However, the practical limitation is two Terabytes. The file size can be in the range of 4GB to 64GB.

File compression

NTFS provides file compression of as much as 50%.

High reliability

NTFS is highly reliable. It is recoverable file system. It uses transaction logs to update the file and folders logs automatically. The system also has a great amount of fault tolerance. It means that if transaction fails due to power or system failure, the logged transactions are used to recover the data.

Bad cluster Mapping

NTFS supports bad-cluster mapping. It means that file system detects bad clusters or areas of disk with errors. If there is any data in those clusters, it is retrieved and stored on another area. The bad clusters are marked to prevent data storage in those areas in futre.