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.net framework European Article Number 13 SECURING WEB SERVER 7.0 in .NET Generating code 128 barcode in .NET SECURING WEB SERVER 7.0




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SECURING WEB SERVER 7.0 generate, create none none with none projectsean 13 printing vb.net successor, Transport none none Layer Security (TLS), established the trust necessary to conduct business on the Internet by securing online communications. Both protocols are widely used in all Web Servers today and are used by most encryption technologies as follows: Authentication and non-repudiation X.509 certi cates and digital signatures are used to verify identities.

This is accomplished through asymmetric encryption using RSA (Rivest, Shamir, and Adleman) Security, Inc. publickey technology. Message privacy Data Encryption Standard (DES), Rivest s Cipher 2 (RC2), or Rivest s Cipher 4 (RC4) symmetric encryption ensures that messages cannot be viewed by third parties.

Message integrity One-way hashes (or message digests) such as Message Digest (MD5) or Secure Hash Algorithm (SHA-1) are used to ensure messages are not altered in transit. The SSL protocol supports the use of a variety of different cryptographic algorithms, or ciphers, for use in operations such as authenticating the server and client to each other, transmitting certi cates, and establishing session keys. Clients and servers can support different cipher suites, or sets of ciphers, depending on factors such as the version of SSL they support, company policies regarding acceptable encryption strength, and government restrictions on the export of SSLenabled software.

These capabilities address fundamental concerns about communication over the Internet and other TCP/IP networks: SSL server authentication enables a user to con rm a server s identity. SSLenabled client software can use standard techniques of public-key cryptography to check that a server s certi cate and public ID are valid and have been issued by a certi cate authority (CA) listed in the client s list of trusted CAs. This con rmation might be important if the user, for example, is sending a credit card number over the network and wants to check the receiving server s identity.

SSL client authentication allows a server to con rm a user s identity. Using the same techniques as those used for server authentication, SSL-enabled server software can check that a client s certi cate and public ID are valid and have been issued by a CA listed in the server s list of trusted CAs. This con rmation might be important if the server, for example, is a bank sending con dential nancial information to a customer and the bank needs to check the recipient s identity.

. Visual Basic 8.2 USING SSL CERTIFICATES TO SECURE DATA An encrypted SSL c none none onnection requires all information sent between a client and a server to be encrypted by the sending software and decrypted by the receiving software, thus providing a high degree of con dentiality. Con dentiality is important for both parties to any private transaction. In addition, all data sent over an encrypted SSL connection is protected with a mechanism for detecting tampering that is, for automatically determining whether the data has been altered in transit.

The SSL 2.0 and SSL 3.0 protocols support overlapping sets of cipher suites.

Administrators can enable or disable any of the supported cipher suites for both clients and servers. When a particular client and server exchange information during the SSL handshake, they identify the strongest cipher suites they have in common and use those for the SSL session. Encryption strength is often described in terms of the size of the session keys used to perform the encryption.

In general, longer keys provide stronger encryption. Key length is measured in bits. For example, 128-bit keys for use with the RC4 symmetric-key cipher supported by SSL provide signi cantly better cryptographic protection than 40-bit keys for use with the same cipher.

. 8.2.1 Symmetric-key Encryption Computer application none none s are predictable and can do only what programmers program them to do. Logic contained within the application is processed over and over again with a certain level of predictability. As such, many of the algorithms used within computer programs can be easily determined with enough observation.

The way that you introduce randomness into an algorithm is through the use of a random value or key that is not easily predictable. This allows the algorithm to utilize the key and produce data that does not lead back to the algorithm s logic without knowledge of the key value. The use of keys within programming can most notably be seen by random number generators that require the use of random seed values to make the output truly random.

Cryptography is the practice and study of hiding information and is used to facilitate secure Internet transactions. Cryptographic algorithms are used to convert ordinary information (plaintext) into what appears to be nonsensical information (ciphertext) and then back again. This allows two parties to communicate securely if they both share the same algorithms.

To create an effective algorithm that is not easily breakable, cryptographic algorithms (or ciphers) must share a random key value. The simplest type cipher uses a trivially related, often identical, key for both decryption and encryption. The key is shared between both parties of the.

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