How To Encrypt The ViewState Using SHA1 Or Some Other Algorithm
Jan 22, 2011
I heard that .NET framework will encrypt the ViewState using SHA1 or some other algorithm. So if i know the SHA1 encryption and decryption algorithm can i tamper a ViewState?I mean a malicious user studies SHA1 encryption algorithm,if he understand that algorith and develops decryption algorithm ,will it open the road of viewstate tampering? or SHA1 or other algorithm uses any random tricks for encryption and decryption?
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Feb 8, 2011
i want to encrypt the password by using the encryption algorithm dll uploaded by the user. is it possible to do the action. how can i call the method used by the user to create the dll.
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Feb 21, 2010
What is ViewState? How is it encoded? Is it encrypted? Who uses ViewState?
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May 2, 2010
I have an asp.net page where I have used FormsAuthentication.HashPasswordForStoringInConfigFile. Encrypted password is saved in database. I have created a forgotPassword page. Where I need to send user his password. How can I decrypt it and send it to user. if SHA1 can not be decryoted what other option should I use to encrypt the passwords?
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Feb 8, 2011
So, I am the approach David Hayden posted on his blog [URL] to create a salt and hash the user's password by taking the user's raw password and the generated salt and using SHA1 to hash the value. I then store the salt and the hashed password in the database. zhe website is currently load balanced, so I was wondering if resulting hash value would be the same for both servers. Here is the snippet of code posted on David Hayden's blog:
private static string CreateSalt(int size)
{
//Generate a cryptographic random number.
RNGCryptoServiceProvider rng = new RNGCryptoServiceProvider();
byte[] buff = new byte[size];
rng.GetBytes(buff);
// Return a Base64 string representation of the random number.
return Convert.ToBase64String(buff);
}
private static string CreatePasswordHash(string pwd, string salt)
{
string saltAndPwd = String.Concat(pwd, salt);
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saltAndPwd, "sha1");
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}
The reason I ask is that this code uses the code snippet: FormsAuthentication.HashPasswordForStoringInConfigFile(saltAndPwd, "sha1");
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May 13, 2010
I have a problem .I am using CAPICOM for digitally sign the data and for this purpose i am using SHA1 algorithm.In CPICOM there is one class CAPICOM.SignedData which is used for this purpose.My problem is how can i give SHA1's hashed data to this class (to it's sign method) for returning the digital signature of exactly 172 bit long?
MY CODE...
[code]....
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Mar 4, 2011
I want the encryption and decryption codes in C# for RSA, MD5 and HMAC-SHA1 for generated key.
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Oct 9, 2010
Now here is the weird thing. First i am running it locally on the built in vs2008 web server.I load my control in fine, do a postback from a linkbutton, locally on my machine it all works fine, no issue.However when it goes onto my host, it falls over with the message:
Failed to load viewstate. The control tree into which viewstate is being loaded must match the control tree that was used to save viewstate during the previous request.Now i also load controls dynamically and use postbacks and things in the admin area of the site...and that works fine, however my front end just keeps failing? See the code behing below:
[Code]....
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Jan 11, 2011
I have problem getting values from viewstate in GetTopThemes.
<asp:ObjectDataSource
ID="sourceGetTopThemes"
runat="server"
TypeName="DBConnection"
SelectMethod="GetTopThemes"
EnableViewState="true"></asp:ObjectDataSource>
[Code]....
}
[Code]....
when the page is not Posted back, I saved all values in the viewstate.
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Apr 30, 2010
I have been getting this error a lot lately with some of my users, and I had a couple of concerns with view state and I have read so many articles but I am still lost..
1. I use masterpage on all the pages and I need viewstate for some of the pages but..
There is a page where a user will fill out the information and then submit this data to a cgi server, and it is where I get most of the Client Disconnected errors, what would happen if I disable viewstate when they click on that button?
Now when a user browses from one page to another, does the view state from the previous page get deleted? If not how would I delete it?
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Sep 24, 2010
I have a shopping cart page (Cart.aspx) that has a button that will (sometimes) post to a third party payment gateway, if payment is necessary. The payment gateway will process the payment and then do a silent post to my website (Order.aspx) so I can update the order status.
Order.aspx always throws an invalid viewstate error, even though viewstate is disabled on the page.
What's happening is that Cart.aspx (which has viewstate enabled) posts to the payment gateway, and the gateway will post it back as part of the silent post. Even though Order.aspx has viewstate disabled and validation disabled, it still tries to validate the __viewstate field it's being given.
I know setting EnableViewState=false will disable the rendering of the __viewstate field, but if another page provides the field, shouldn't it still skip validation? I tried calling ViewState.Clear() on the Page_Init event of Order.aspx, but ViewState is apparently empty. how to get around this? I don't want to disable ViewState on Cart.aspx (in some cases it may be necessary), but I can't figure out how to clear it on Order.aspx.
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Jun 21, 2010
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Dec 1, 2010
We are converting an ASP site (using DotNetNuke) to a new PHP site. The only thing we have right now is a full export of the existing database. One of the tables is called "aspnet_Membership" and contains the following fields:
Password (looks like base64)
PasswordFormat (always value 2)
PasswordSalt (looks like base64)
PasswordQuestion (always empty)
PasswordAnswer (always empty)
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Dec 28, 2010
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Oct 23, 2010
I need an algorithm to determine who match who in the tournament bracket, say I have 32 ( number could be flexible) contestants seeded 1 to 32, at round 1, seed 1 matches with 32, seed 2 with 31 and so forth. What about 2nd, 3rd, 4th and 5th round? I need an algorithm to be programmed into computer.
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Jan 31, 2011
Using this code on the javascript side and
Using sha As New SHA256Managed
Using memStream As New MemoryStream(Encoding.ASCII.GetBytes("Hello World!"))
Dim hash() As Byte = sha.ComputeHash(memStream)
Dim res As String = Encoding.Default.GetString(hash)
End Using
End Using
I have been unable to recreate the same hash for the same values with these two bits of code.
The javascript implementation returns: 7f83b1657ff1fc53b92dc18148a1d65dfc2d4b1fa3d677284addd200126d9069
and the vb.net example returns: ƒeñüS-ÁHÖ]ü-KÖw(JÝÒ mi"
What am I missing? I assume it's something to do with the character encoding?
[code]...
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Jun 21, 2010
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[Code]....
Which throws an CryptographicException: Specified key is not a valid size for this algorithm.
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Feb 13, 2010
to write function in C#
I need to write function for this algorithm.
SSCC
The check digit calculation uses the standard method. Suppose you want to calculate the check digit for ID number 10614141192837465.
Step One: From the right to left, start with odd position, assign the odd/even position to each digit.
Index
1
2
3
4
5
Digit
1
0
6
1
Position
odd
even
odd
even
Step Two: Sum all digits in odd position and multiply the result by 3.
(1+6+4+4+1+2+3+4+5)*3=90
Step Three: Sum all digits in even position.
(0+1+1+1+9+8+7+6)=33
Step Four: Sum the results of step three and four:
90+33=123
Step Five: Divide the result of step four by 10. The check digit is the number which adds the remainder to 10. In our case, divide 123 by 10 we get the remainder 3. The check digit then is the result of
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Mar 17, 2010
I have a legacy MySQL database which stores the user passwords & salts for a membership system. Both of these values have been hashed using the Ruby framework - roughly like this:
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But from the length of the Base64 encoded strings that are stored (28 characters) it seems that the SHA1 hashes that ASP.NET membership generates are only 20 characters long, rather than 40. From some other reading I have been doing I am thinking this has to do with the number of bits per character/character set/encoding or something related.
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Feb 23, 2010
I have a page that will receive an encrypted query string containing a user name, password & jobId, the problem is I don't want someone to be able to grab the encrypted url (browser history) and reuse it, so it has to change each time the page is requested.
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Is this the best way to do this?
Is there a mutating encryption method out there I could use "out the box"?
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Jul 30, 2010
Ranking of CONTAINSTABLE StatisticalWeight = Log2( ( 2 + IndexDocumentCount ) / KeyDocumentCount ) Rank = min( MaxQueryRank, HitCount * 16 * StatisticalWeight / MaxOccurrence ) can anyone explain this algorithm, more importantly i want to know about these variables used in this algorithm, whats their purpose?it would be more useful for me?
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Mar 30, 2010
I am creating a search page where we can find the product by entering the text.
ex: Brings on the night.
My query bring the records which contain atleast word from this.
Needs: 1. First row should contains the record with the given sentence. 2. second row next most matching. 3. Third row next matching ...etc
How to achieve this. Is there any algorithm for this.
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Oct 1, 2010
I am rewriting my PHP website into C# .NET, and I need to be able to set the algorithm used by the CreateUserWizard / Membership Provider to SHA1 so that I can port all of the user accounts over without having to force them all to reset their passwords when this project is complete. At current glance it doesn't look like it is using SHA-1, and my Googlefoo is failing me.
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