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This article mainly shows you "how to encrypt VB. NET", the content is simple and easy to understand, clear organization, I hope to help you solve doubts, let Xiaobian lead you to study and learn "VB. NET how to encrypt" this article bar.

Common VB. NET encryption and encoding algorithms have been implemented in the. NET Framework, providing great convenience to coders, in namespaces such as: System.Security.Cryptography.System.Security.Cryptography namespace provides VB. NET encryption services, including secure data encoding and decoding, and many other operations such as hashing, random number generation, and message authentication. System.Security.Cryptography is organized as follows:

1. Private key encryption

Private-key encryption is also known as symmetric encryption because the same key is used for both encryption and decryption. Private-key encryption algorithms are very fast (compared to public-key algorithms) and are especially suited for performing cryptographic transformations on larger data streams.

The. NET Framework provides the following classes that implement private key encryption algorithms:

◆DES：DESCryptoServiceProvider

◆RC2：RC2CryptoServiceProvider

◆Rijndael（AES）：RijndaelManaged

◆3DES：TripleDESCryptoServiceProvider

Public key encryption and digital signature

Public-key encryption uses a private key that must be kept secret from unauthorized users and a public key that can be made public to anyone. Data encrypted with the public key can only be decrypted with the private key, while data signed with the private key can only be verified with the public key. The public key can be used by anyone; the key is used to encrypt data to be sent to the private key holder. Both keys are *** for the communication session. Public-key encryption algorithms are also called asymmetric algorithms because one key is needed to encrypt data and another key is needed to decrypt it.

The. NET Framework provides the following classes that implement public-key encryption algorithms:

◆DSA：DSACryptoServiceProvider

◆RSA：RSACryptoServiceProvider

3. Hash value

Hashing algorithms map binary values of arbitrary length to smaller binary values of fixed length, called hash values. A hash value is an extremely compact numerical representation of a piece of data ***. If you hash a paragraph of plaintext and change even one letter of that paragraph, subsequent hashes will yield different values. It is computationally impossible to find two different inputs hashed to the same value, so the hash value of the data can verify the integrity of the data.

The. NET Framework provides the following classes that implement digital signature algorithms:

HMAC: HMACSHA1 (HMAC is a Hash algorithm using a secret key)

◆MAC：MACTripleDES

◆MD5：MD5CryptoServiceProvider

◆SHA1：SHA1Managed、SHA256Managed、SHA384Managed、SHA512Managed

4. Random number generation

VB. NET encryption keys need to be as random as possible in order to make the generated keys difficult to reproduce, so random number generation is an integral part of many encryption operations.

In the. NET Framework, RNGCryptoServiceProvider is an implementation of the random number generator algorithm, and for data algorithms, the. NET Framework is implemented in other namespaces, such as Convert class to implement Base64 encoding, System.Text to implement encoding conversion, etc.

Simple routine: first you need to reference the namespace System.Security.Cryptography

MD5 encryption:

Dim md5 As MD5CryptoServiceProvider Dim bytValue () As Byte 'byte array to encrypt Dim bytHash () As Byte ' byte array generated after encryption Dim result As String md5 = New MD5CryptoServiceProvider 'converts original string to byte array bytValue = System.Text.Encoding.UTF8.GetBytes (cpuid)' computes hash, and returns a byte array bytHash = md5.ComputeHash (bytValue) md5.Clear ()'byte array converted to string result=Convert.ToBase64String (bytHash)

The others are similar! You can try it yourself!

From the above point of view, the. NET Framework for data encryption/encoding support is relatively good, greatly convenient for developers, but the fly in the ointment is that the data encryption algorithm in the. NET Framework is still not complete, such as IDEA, BLOWFISH, other algorithms, such as ElGamal, Deffie-Hellman, ECC, etc., for some other data verification algorithm support is not enough, such as CRC, SFV, etc., developers can only do porting from the early code or find third-party vendors to implement.

The above is "VB. NET how to encrypt" all the content of this article, thank you for reading! I believe that everyone has a certain understanding, hope to share the content to help everyone, if you still want to learn more knowledge, welcome to pay attention to the industry information channel!

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