Brought from our old site: http:\/\/salearningschool.com\/displayArticle.php?table=Articles&articleID=1355&title=Encryption%20and%20.Net<\/p>\n
Encryption and .Net<\/p>\n
Dot net provides rich support for data encryption. the namespace System.Security.Cryptography includes the encryption features.<\/p>\n
There are three primary concepts related to encryption such as Hashing, Symmetric Encryption, and Asymmetric encryption. A hash is a data fingerprint, a small data that represents the uniqueness of a large block of data. In Symmetric Encryption, a single key is used for both encryption and decryption. In Asymmetric encryption, two different keys are used, one for encryption and another one for decryption. In real world applications, a combination of all three methods are used to provide better security.<\/p>\n
A digital transmission of a check can be as follows: create the hash of the check, encrypt the hash with the public key using asymmetric encryption, apply the encrypted hash on the document, encrypt the symmetric encryption key with asymmetric encryption method, encrypt the check with symmetric encryption, transmit the encrypted key and encrypted document to the receiver<\/p>\n
Hash Example<\/p>\n
\n hash = New Encryption.Hash(Encryption.Hash.Provider.CRC32)\n data = New Encryption.Data(\"Hash Browns\")\n hash.Calculate(data)\n<\/pre>\nSymmetric example:<\/p>\n
\n sym = New Encryption.Symmetric(Encryption.Symmetric.Provider.Rijndael)\n key = New Encryption.Data(\"Pass\")\n Encryption.Data encryptedData;\n encryptedData = sym.Encrypt(New Encryption.Data(\"Secret\"), key)\n string base64EncryptedString = encryptedData.ToBase64\n<\/pre>\nAsymmetric Example<\/p>\n
\n asym = New Encryption.Asymmetric\n pubkey = New Encryption.Asymmetric.PublicKey\n privkey = New Encryption.Asymmetric.PrivateKey\n asym.GenerateNewKeyset(pubkey, privkey)\n\n secret = \"ancient chinese\"\n Encryption.Data encryptedData\n encryptedData = asym.Encrypt(New Encryption.Data(secret), pubkey)\n Encryption.Data decryptedData \n asym2 = New Encryption.Asymmetric\n decryptedData = asym2.Decrypt(encryptedData, privkey)\n<\/pre>\nFrom: http:\/\/sitestree.com\/?p=3742
Categories:.Net Web Applications
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