Encrypt and decrypt a string

Question

How we can encrypt and decrypt a string in ASP. net ?

Mayur Gujrathi · Answer

there are many methods one of is following add following name space Using System.Security.Cryptography remember whenever you are encrypting and decrypting same word you will have to add same key parameter it means if you are encrypting word csharp and sending parameter c in string strKey parameter then while decrypting also you will havew to pass same key in decrypt function with decrypt string public static string Encrypt(string strToEncrypt, string strKey) { try { TripleDESCryptoServiceProvider objDESCrypto = new TripleDESCryptoServiceProvider(); MD5CryptoServiceProvider objHashMD5 = new MD5CryptoServiceProvider(); byte[] byteHash = null; byte[] byteBuff = null; string strTempKey = strKey; byteHash = objHashMD5.ComputeHash(ASCIIEncoding.ASCII.GetBytes(strTempKey)); objHashMD5 = null; objDESCrypto.Key = byteHash; objDESCrypto.Mode = CipherMode.ECB; //CBC, CFB byteBuff = ASCIIEncoding.ASCII.GetBytes(strToEncrypt); return Convert.ToBase64String(objDESCrypto.CreateEncryptor().TransformFinalBlock(byteBuff, 0, byteBuff.Length)); } catch (Exception ex) { return "Wrong Input. " + ex.Message; } } public static string Decrypt(string strEncrypted, string strKey) { try { TripleDESCryptoServiceProvider objDESCrypto = new TripleDESCryptoServiceProvider(); MD5CryptoServiceProvider objHashMD5 = new MD5CryptoServiceProvider(); byte[] byteHash = null; byte[] byteBuff = null; string strTempKey = strKey; byteHash = objHashMD5.ComputeHash(ASCIIEncoding.ASCII.GetBytes(strTempKey)); objHashMD5 = null; objDESCrypto.Key = byteHash; objDESCrypto.Mode = CipherMode.ECB; //CBC, CFB byteBuff = Convert.FromBase64String(strEncrypted); string strDecrypted = ASCIIEncoding.ASCII.GetString(objDESCrypto.CreateDecryptor().TransformFinalBlock(byteBuff, 0, byteBuff.Length)); objDESCrypto = null; return strDecrypted; } catch (Exception ex) { return "Wrong Input. " + ex.Message; } }

Muralidharan Deenathayalan · Answer

For encrypt /decrypt the string which algorithm that you're going to use ? One way /two way ? http://www.c-sharpcorner.com/UploadFile/Suprotim/CryptographyInDotNET11282005053700AM/CryptographyInDotNET.aspx http://www.c-sharpcorner.com/UploadFile/krishnasarala/5184/ http://www.c-sharpcorner.com/UploadFile/ahsanshakir/EncryptFile12212006042816AM/EncryptFile.aspx Please read our recommend article section. Hope this helps you.

Encrypt and decrypt a string

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