Lesson 1: Maintaining a Server-Level Security Strategy in VB.NET

Maker QR-Code in VB.NET Lesson 1: Maintaining a Server-Level Security Strategy

Lesson 1: Maintaining a Server-Level Security Strategy
QR Code 2d Barcode Generator In Visual Basic .NET
Using Barcode creation for VS .NET Control to generate, create QR-Code image in VS .NET applications.
www.OnBarcode.com
Quick Response Code Decoder In Visual Basic .NET
Using Barcode recognizer for .NET framework Control to read, scan read, scan image in VS .NET applications.
www.OnBarcode.com
symmetric key encryption. Symmetric keys form the bottom level of the encryption hierarchy and can be used to secure data or other symmetric keys.
Print Barcode In VB.NET
Using Barcode printer for .NET Control to generate, create barcode image in VS .NET applications.
www.OnBarcode.com
Barcode Recognizer In Visual Basic .NET
Using Barcode decoder for .NET framework Control to read, scan read, scan image in .NET applications.
www.OnBarcode.com
Encryption with a User-Supplied Password
Paint QR-Code In Visual C#
Using Barcode encoder for .NET framework Control to generate, create Denso QR Bar Code image in VS .NET applications.
www.OnBarcode.com
QR Code JIS X 0510 Maker In Visual Studio .NET
Using Barcode drawer for ASP.NET Control to generate, create Quick Response Code image in ASP.NET applications.
www.OnBarcode.com
The simplest and weakest form of encryption/decryption uses a key supplied by the user. The advantage of this approach is that because the password is not kept on the system, there is no need to store it secretly. However, a user-supplied password is typically sent across the network more often than a stored password, and this requires further encryption, which could affect performance. The main disadvantages, however, are that no control exists over how securely the user stores his or her password and that SQL Server 2005 does not enforce strong user-supplied passwords. Unless the front-end application validates the password when it is chosen, the user can (and probably will) choose a noncomplex, insecure password. For added security, you should use encryption with a user-supplied password in conjunction with another encryption method. The EncryptByPassPhrase() function encrypts data with a user-supplied password. This function takes as its parameters the value to be encrypted and the password, both of which can be either string literals or values of a string type (char, nchar, wchar, varchar, or nvarchar). The DecryptByPassPhrase() function then decrypts the data, taking as parameters the password and the cipher text. The cipher is salted with an arbitrary value so that the cipher text will be different each time you encrypt a message. This approach does not, however, affect the decryption process.
Make QR Code 2d Barcode In .NET Framework
Using Barcode creation for Visual Studio .NET Control to generate, create Denso QR Bar Code image in Visual Studio .NET applications.
www.OnBarcode.com
Matrix 2D Barcode Maker In Visual Basic .NET
Using Barcode printer for Visual Studio .NET Control to generate, create Matrix Barcode image in Visual Studio .NET applications.
www.OnBarcode.com
Creating Symmetric Keys
PDF-417 2d Barcode Encoder In Visual Basic .NET
Using Barcode generator for .NET framework Control to generate, create PDF 417 image in .NET framework applications.
www.OnBarcode.com
Bar Code Encoder In VB.NET
Using Barcode generator for Visual Studio .NET Control to generate, create barcode image in Visual Studio .NET applications.
www.OnBarcode.com
The next most simple (and least secure) method is to encrypt the data with a symmetric key stored in the database. Because the same key is used both for encrypting and decrypting data, both sides of an encrypted dialog conversation need to pass the symmetric key securely, as both sides need the same key. If, however, a SQL Server uses a symmetric key to encrypt data immediately before it is stored in a database and decrypt it immediately after it has been extracted, the key does not need to be sent across the network. The CREATE SYMMETRIC KEY statement creates a symmetric key in a database, for example:
Printing Bar Code In VB.NET
Using Barcode maker for VS .NET Control to generate, create bar code image in Visual Studio .NET applications.
www.OnBarcode.com
Make UPC - 8 In VB.NET
Using Barcode creator for VS .NET Control to generate, create UPC - 8 image in Visual Studio .NET applications.
www.OnBarcode.com
CREATE SYMMETRIC KEY MyCreditCardKey WITH ALGORITHM = DESX ENCRYPTION BY PASSWORD = 'ghf@BR*hJ98R';
USS Code 39 Creation In Java
Using Barcode maker for Java Control to generate, create Code 39 image in Java applications.
www.OnBarcode.com
Recognize Code 128B In Visual Basic .NET
Using Barcode reader for VS .NET Control to read, scan read, scan image in .NET framework applications.
www.OnBarcode.com
11
Reading Barcode In Visual Basic .NET
Using Barcode decoder for .NET framework Control to read, scan read, scan image in VS .NET applications.
www.OnBarcode.com
PDF-417 2d Barcode Generation In .NET
Using Barcode drawer for ASP.NET Control to generate, create PDF 417 image in ASP.NET applications.
www.OnBarcode.com
Security Strategies
Code-128 Reader In Visual C#
Using Barcode scanner for .NET framework Control to read, scan read, scan image in .NET applications.
www.OnBarcode.com
GS1 - 13 Maker In None
Using Barcode creator for Online Control to generate, create GTIN - 13 image in Online applications.
www.OnBarcode.com
Symmetric key encryption can use the DES, TRIPLE_DES, RC2, RC4, DESX, AES128, AES192, and AES256 algorithms. In addition to (or instead of) encrypting the key with a password, you can choose to use a certificate or another symmetric key. If the key is a temporary key, you do not need to encrypt it. You can use the WITH clause to include two other options: DERIVED_FROM derives the key from a user-supplied password, and IDENTIFIED_BY lets you specify a phrase to identify data encrypted with the key.
Barcode Encoder In VS .NET
Using Barcode drawer for ASP.NET Control to generate, create bar code image in ASP.NET applications.
www.OnBarcode.com
Data Matrix ECC200 Recognizer In None
Using Barcode decoder for Software Control to read, scan read, scan image in Software applications.
www.OnBarcode.com
Creating Asymmetric Keys
Asymmetric key encryption uses a private key, which is stored locally and kept secret, and a related public key. Data encrypted with the public key is decrypted with the corresponding private key, and vice versa. The private key never needs to be transmitted over the network, because data is encrypted with the intended recipient s public key and only the intended recipient can decrypt it with his or her private key. This solution does not provide any guarantee of the sender s identity because anyone can encrypt data with a public key. Two sets of keys are therefore necessary. A sender needs to encrypt data (the signature) with his or her private key (which proves sender identity), and then encrypt the cipher text with the recipient s public key. The recipient then decrypts the cipher text with his own private key and verifies the signature using the sender s public key.
Copyright © OnBarcode.com . All rights reserved.