Security :: Encrypting And Decrypting Data

Aug 24, 2010

I have a webApplication in which i want to encrypt the data using Public key and whan it reach to the destination webapplication it will decrypted there with corresponding private key . Is there is any way to creating this pair of key?

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Security :: Encrypting / Decrypting Data At Runtime

Feb 18, 2010

I have a problem hopefully someone out there will steer me in the right direction.

I have a web application that I am going to put on a standalone cd - currently the data is "Safe" because the database is in in the app folder and the code is located in the codebehind.

My problem is i'm putting this on a CD as a standalone site, anyone can access the database, or find the XML....

Is there a way to generate an encrypted Database / XML Page, that is complied with the CD, that the program can decrypt and access with a embedded key?

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Security :: Encrypting And Decrypting Password?

Apr 22, 2010

I want to encrypt the password entered by the do i go about it?is there any built-in function for it or will i be required to write a code for it?

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I received some code, a small c# application which manually posts a shared username/pwd to a 3rd party website for auto-logins from our intranet site. During transit the password is encrypted, but not within the application. Within this application a namevaluecollection is used and the username and password are hard coded. Originally the thought was, who cares if its hard coded because its shared between everyone anyway. Now we want to encrypt the username and password from within the application. I'm not sure the best way to accomplish the goal of making sure the password is encrypted "at rest". Normally I've seen passwords stored and encrypted within a database. I know we'll obviously have to move the password out of the application and store it somewhere else, I'm just not sure where. Do we move the username and pwd to the web.config file? I really am not sure the best way to approach this.

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I am trying to decrypt using an X509 certificate private key. I am using the following function:


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I have an external site developed in php that send me a string cripted with this php function:

const SALT = "chiave";
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return rawurlencode(base64_encode(mcrypt_encrypt(MCRYPT_RIJNDAEL_256, self::SALT, $text, MCRYPT_MODE_ECB, mcrypt_create_iv(mcrypt_get_iv_size(MCRYPT_RIJNDAEL_256, MCRYPT_MODE_ECB), MCRYPT_RAND))));

and then I need to decrypt this in

How can I do?


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Security :: Getting "Invalid Data" While DES-decrypting?

Mar 10, 2011

I'm trying a simple encryption procedure, encrypting/decrypting a HEX value. Encryption seems to work fine: result of encryption is "85772B6784BC1505". While trying to decrypt I get an "Invalid data"-exception.


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Security :: Password Encrypting?

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I have been trying to encrypt password and found a code which is working with Access fine but as i have changed to SQL it is not decoding the encrypted text.. it amazes me..this SQl code is not letting me log on..


Whereas this OlebDB/Access is working fine


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Security :: Encrypting Section In Web.config?

May 3, 2010

I am wondering how to encrypt the below information in the "web.config" file of the "Account" folder (where we have the secured pages):


My issue here is that even after I compiled my application (using "aspnet_compiler -v /reports c:
eports"), the information inside the web.config file of the Account folder still not encrypted, and I want to publish my site to the customer server. So, since this server is a customer server, then they can access this "web.config" file and change our web-application security behaviour (correct me if I am wrong). Basically, I don't want the customer to even have access to our secured pages when they access our web-application using the web browser. How to solve this issue?

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Security - Encrypting Web Configuration Sections In 3.5?

Mar 9, 2010

Is there any tools available to encrypt and decrypt Web configuration sections like connection string ,etc.?

Can i get any add-on for this?If i use Enterprise Library i can do so,but without that is there any simple utility available?

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Security :: Encrypting With An X509 Certificate.

Mar 14, 2011

I have created an x590 certificate that is in the file :

I am trying to acces the public key to encrypt some plain text.

The system is throwing an "System.ArgumentOutOfRangeException" at the line

Dim certificate As X509Certificate2 = certificateCollection(0)

Can anyone tell me where I am going wrong or tell me another way to access the public key

This is the complete code:
Imports System.Security
Imports System.Security.Cryptography.X509Certificates
Imports System.Security.Cryptography.X509Certificates.X509Certificate2
Imports System.Security.Cryptography.Pkcs
Partial Class encryptwithcertificare
Inherits System.Web.UI.Page
Protected Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim encoding As UTF8Encoding = New UTF8Encoding
Dim cleartext As String = Textbox1.Text
Dim myStore As X509Store = New X509Store()
Dim certificateCollection As X509Certificate2Collection = myStore.Certificates.Find(X509FindType.FindBySubjectName, "bobby", True)
Dim certificate As X509Certificate2 = certificateCollection(0)
Dim code() As Byte = EncryptwithCertificate(cleartext, certificate)
Label1.Text = Convert.ToBase64String(code)
End Sub
Shared Function EncryptwithCertificate(ByVal cleartext As Byte, ByVal certificate As X509Certificate2) As Byte()
Dim encoding As UTF8Encoding = New UTF8Encoding
Dim cleartextsbyte() As Byte = encoding.GetBytes(cleartext)
Dim contentinfo As ContentInfo = New ContentInfo(cleartextsbyte)
Dim envelopedCms As EnvelopedCms = New EnvelopedCms(contentinfo)
Dim recipient As CmsRecipient = New CmsRecipient(certificate)
Return envelopedCms.Encode()
End Function
End Class

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Security :: Encrypting Passwords On Client?

Nov 1, 2010

I want the login password to not be sent in plaintext (due to the risk of hijacking). I know that this can be achieved in principle using MD5 or the like, but is there a common implementation for use with Asp.Net? Of course, it's crucial that the resulting hash (?) isn't easy to decrypt. When I read various posts on this matter, some people say it's just to do a reverse on the encrypted string, so that in effect, this is totally useless.

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Security :: Ways Of Encrypting Querystrings?

Sep 8, 2010

I have been looking at ways of encrypting querystrings and I have found a few good examples.. but, I just want some clarification on what is most often referred to as the EncryptionKey and the characters that are in that key....Is there basically an unlimited number of alphanumeric combinations that could be used in the following code as the encryption key, is there anything that someone should be CAREFUL about including in that key?

using System.Security.Cryptography;
private static string EncryptionKey = "!#$a54?3";
/// other examples: "r0b1nr0y"
///in a try-catch:
key = System.Text.Encoding.UTF8.GetBytes(EncryptionKey.Substring(0, 8));
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Security :: Deploying And Encrypting Web.Config On Server

Nov 12, 2010

I have written a couple methods that encrypt and decrypt the appSettings section of my web.config file using the WebConfigurationManager. I just hooked up the methods to the page_load event to test that it works, which it does. Now I need to deploy to a web farm and need advice. What is the best way to make it so I can encrypt, but more importantly decrypt the web.config when I need to? I thought about putting a hidden page with "encrypt" and "decrypt" buttons, but that seems risky. What is the "accepted" method for rolling out something like this?

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Security :: Encrypting Passwords With T-SQL That Will Be Decrypted By Membership Provider

Mar 4, 2011

I have been killing myself over this for a couple weeks now and cannot find a viable solution. Here's my scenario:

I have a DTSX package that imports user data from an external database. It then creates user accounts and profiles in the local database. Users can also be created via a custom ASP.NET Membership Provider. The provider must be able to authenticate both types of users.

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Sep 23, 2010

Is aspnet_regiis.exe secure? If i encrypt using aspnet_regiis.exe, will it automatically decrypt the string and wont give any error? Need an insight into this stuff.... Is Rsa the best option or wat? Wat's the best way to encrypt/decrypt programmatically?

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Security :: Encrypting Connection String In Web.config In Shared Hosting Environment?

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My problem is that I'm going to have a SQL Server database and website that accesses that database via a hosting provider, most likely, using ASP.Net. I need to make sure the connection string in the web.config file is as secure as possible, because the database will actually be storing trivia questions for a game I'm developing, and the clients will be accessing these questions, saving specific state related details, and other details, to the database, so every player that plays the game will have their details stored in this database. I need to ensure hacking is very difficult to accomplish.

From my research it appears as though the only viable solution for your web.config when you've got a hosting account with something like is to use SQL Server security to connect to your SQL Server database and place those details in the web.config file. Is this correct? It seems that this is the most likely scenario for most users, because we don't have access to our hosting providers IIS servers in order to use Windows authentication with SQL Server access and then use DPAPI encryption from there.

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Forms Data Controls :: Decrypting SQL Column On RowDataBound In GridView?

Mar 24, 2010

I have an internal web application which uses a custom encryption class to convert strings to varbinary(50) columns in SQL. When I display the table in a GridView, I want to use the RowDataBound event to decrypt the encrypted column back to a string to display.

Currently I have the following in my RowDataBound event:


This throws an exception when I try to load the page: TransformFinalBlock - Length of the data to decrypt is invalid.

I have tried just fetching the data from SQL in my query but the e.Row.Cells(3).Text evaluates to System.Byte[], so I tried using CAST([EncrytedColumn] AS varchar(50)) to convert the varbinary(50) to varchar(50), but this still resulted in the same exception being thrown.

My only solution so far has been to manually fetch the SQL data into a DataTable and decrypt the column before displaying it in the GridView, but I prefer the automated method of binding the SQLDataSource to the GridView.

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Security :: Encrypting Password(password Salt)?

May 27, 2010

I would like to encrypt the password and store it in DB. And if user forgots the password and request for password i have to send him a dummy password to his mail id how can i implement this if any code available At the time of registration i have to encrypt or salt the password and save it to DB..

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SQL Server :: Encrypting Data In Sql 2008

Jan 27, 2011

When I use symmetric key for encrypting data in sql server using encryptbykey() function on column of table

For Eg:I use following code

create symmetric key symkey
with algorithm=Triple_des
encryption by pasword='abc_1234!!!'

after this I require to open the key and then used the function to encrypt data but...

how excatly the key generated and password is used internally for encrypting data.what role the algorithm playhere.I would like to know the proper mechanism of it.Bit confused abt keys concept.

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.net - Leveraging MachineKey For Encrypting Own Data?

Sep 10, 2010

I have some data I want to encrypt in an ASP.NET MVC application to prevent users from tampering with it. I can use the Cryptography classes to do the actual encryption/decryption, no problem there. The main problem is figuring out where to store the encryption key and managing changes to it.

Since ASP.NET already maintains a machineKey for various things (ViewData encryption, etc), I was wondering if there were any ASP.NET functions which let me encrypt/decrypt my own data using the machineKey? This way I would not have to devise my own key management system.

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C# - How To Retain Carriage Returns After Encrypting Data

Apr 9, 2010

I have this following setup, a textarea named with some data in it that may have carriage returns and another textarea that has style='display:none' in order to make it hidden as follows:

<textarea id="myTextarea" onBlur="encryptMyData()">

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Decrypting Password / Copy User's Data From Old Table To New Table?

Apr 2, 2010

I have an database which has users table. In this table password is saved as sncrypted. Now, I am creating my own users table. I want to copy user's data from my old table t this table. I can to decrypt old users table password. Which encryption technique is used by default in aspnet database for passwords.

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