Digital Signaturesin xml

Written by Pawan Bangar


The Xml Digital Signatures providesrepparttar security services of data integrity, authentication, and nonrepudiation.

In a simple shorthand notationrepparttar 105102 structures of DSIG signatures with its four elements. Elements appear zero or more times if followed by "*", zero or once if followed by"?", and once or more if followed by "+". When not followed by a symbol, elements appear only once.

Removing attributes and contents inrepparttar 105103 notation it becomes an example of signature object using three of its four elements.

The signature object containsrepparttar 105104 cryptographic hash of any signed information, and a reference torepparttar 105105 information itself. The signed information may be an arbitrary document. However, often, it will be an XML object. The ability to sign only specific elements of XML documents is one ofrepparttar 105106 most important features of DSIG. It letsrepparttar 105107 unsigned parts ofrepparttar 105108 XML document is enhanced, modified, or removed for privacy or efficiency, keepingrepparttar 105109 signature valid.

DSIG signatures may contain eitherrepparttar 105110 signed XML object contained inrepparttar 105111 XML object, or detached fromrepparttar 105112 signed object or document. Whenrepparttar 105113 signed XML object envelopsrepparttar 105114 signature,repparttar 105115 enveloped signature value itself is not included inrepparttar 105116 signature calculation and validation computation. For this you userepparttar 105117 enveloped-signature transform, removingrepparttar 105118 whole signature element in which it is contained fromrepparttar 105119 digest calculation.

Public key digital signatures that provide nonrepudiation, such as RSA, are computationally intensive operations; therefore, DSIG also allows shared-key authentication that provides authentication but nonrepudiation. Collision resistant hashing ofrepparttar 105120 signed content is also used to save computational requirements.

Generating DSIG signatures:

1. Identity resources to be signed. 2. Calculatingrepparttar 105121 digest value and composing reference elements for each resource. 3. Composingrepparttar 105122 signed info element from all references. 4. Computing value of signature method over identity resources to be signed element by applying algorithms like DSA, RSA-SHA1, etc 5. Composingrepparttar 105123 signature elements with signedInfo, signature value, identity key used to sign, and other optional objects like signature properties.

Connecting and Accessing Data through ADO.NET

Written by Pawan Bangar


Microsoft's ADO.NET technology offers a solution to many ofrepparttar problems associated with data access.

Accessing data has become a major programming task for modern software programming, both for standardalone applications and for web based applications. Microsoft's ADO.NET technology offers a solution to many ofrepparttar 105101 problems associated with data access.

ADO.NET is an improvement to Microsoft ActiveX Data Objects (ADO). It is a standards-based programming model for creating distributed data-sharing applications. ADO.NET offers several advantages over previous versions of ADO and over other data access components. These benefits fall intorepparttar 105102 following categories:

Interoperability Maintainability Programmability Performance. Connecting to a database: For performing and operation we need to connect to a database. This is done automatically through ADO connection, of which code is associated with VS.net Programming environment.

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