Decrypt And Verify A .Net Encrypted File?
Mar 10, 2011How can I decrypt a file encrypted in vb.net? Is there a possibility here?
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Decrypt A File That Was Encrypted With Des?
Nov 10, 2011i am trying to decrypt a file that was encrypted with Des. However not all of the file is encrypted just a few lines are. Here is an example of the file im trying to decrypt:
Random text
Encrypted Text
MD5 Hash
Encryption Key(Only there for tests)
Number of encrypted lines
The idea is to read the last three lines into variables and use them to decrypt the text. At the moment i use the number of lines - (the number of encrypted lines + 3) to find where the encrypted text starts. Then i was trying to copy the encrypted text to a temp file so i could run the code bellow on it, however i am getting an encoding error apparently i need to be using base64 or something. So my question is can anybody explain to me or show me how i can pull the encrypted text out of the file so that i can use the code bellow on it.
Dim DES As New DESCryptoServiceProvider()
'A 64-bit key and an IV are required for this provider.
'Set the secret key for the DES algorithm.
[Code].....
Decrypt Java AES 128Bit Encrypted String Which Has Been Encrypted Using Key Only (no IV) ?
Oct 14, 2010I am attempting to find some code to use in VB.NET to decrypt a string that has been encrypted using the Java crypto libary.All of the code I have found so far uses an Initialisation Vector and Key to decrypt but the string has been encrypted using the Key only. (Using an Initialisation Vector is apperently an optional step in Java).Does anyone know of code that I can use (preferably in VB.NET but i could convert C#) to decrypt AES 128 Bit encoded string without an Initialisation Vector?
View 1 RepliesHow To Decrypt Data That Had Already Encrypted Using MD5
Oct 23, 2011I'm using this function to encrypt data but how do I decrypt it?
Public Function GenerateHash(ByVal SourceText As String) As String
[code...]
Deployment Of Encrypted App.config - Failed To Decrypt Using Provider
Apr 21, 2010I've created a console .Net application and encrypted the app.config file with RSAProtectedConfigurationProvider. It works fine in an IDE on my XP desktop. Then I deployed my application to a Windows 2003 server. The package included the app's executable along with the encrypted app.exe.config file.
However, the application failed on the server with the following exception: Unhandled Exception: System.Configuration.ConfigurationErrorsException: Failed to decrypt using provider 'RsaProtectedConfigurationProvider'. Error message from the provider: The RSA key container could not be opened.
I decided to encrypt app.config on the server so I copied app.config and encrypted it. The app.exe.config looked encrypted and I ran the application. However, it failed: although it didn't raise an Rsa exception as before, it couldn't read a connection string. After I decrypted app.exe.config, I found that it contained only the below string
although the original app.config had contained an application-specific connection string. I think that in order to resolve my issue I should export the RSA keys from my desktop to the server. Can you advise how can I do it (it's not a Web application!).
Decryption Of Encrypted File?
Dec 22, 2010i will like to know if it will be possible to decrypt and encrypted file in vb.net or any without knowing the form of encryption..any information on how to go by it... in that if you lose the form on encryption can it be decrypted?
View 1 RepliesRead A File That Is Encrypted Using PGP Netshare?
Oct 27, 2011I am using streamreader to read a file that is encrypted using PGP netshare. The file opens fine on my PC and i can read the file using Streamreader when it is unencrypted, but when i add it to an encrypted folder, I get back gibberish when the file is read. Below is a snipit of code, but i feel as though this may not be the problem.
[Code]...
Read From Encrypted Excel File?
Sep 22, 2009Working in VB in VS 2008 I'm trying to read from an Excel file using Oledb. I have no problem with it when the file is not encrypted, but the client has set a password on the working copy.
I read elsewhere that it's not possible to read an encrypted Excel file this way, but I find that hard to believe.
Encryption/Decryption - Code To Encrypt A File->networkstream->Decrypt The File
Feb 28, 2011I'm having trouble writing the code to encrypt a file->networkstream->Decrypt the file.. I've tried several ways, but I keep failing....
View 1 RepliesVS 2005 Possible To Be Able To Encrypt File / Have Application Be Able To Decrypt It And Amend File As Necessary
Mar 17, 2009I would like to know if it is possible to be able to encrypt a file and have my application be able to decrypt it and ammed the file as necessary. and then when the program exits it will encrypt the file back up.
View 4 Replies.net - Having A File Encrypted To Lets Know The Client Software Got Activated?
Aug 26, 2011I am facing a rather odd problem right now. If you fellow this : Best place to put key or password used for encryption? i was looking at a way to encrypt data. Using RSA seemed to be a good choice. However we have a problem since my requirements are thoses fellowing...Client must have a file encrypted in order to determine if the software is activated.
That actually mean that the client must read the encrypted file.. but the problem is that we actually need the private key to be there which isnt a good idea since some poeple could start making their license file using that key. The activation server encrypt the data file which are sent back to the client and then the client save that file.
Client must have a file encrypted in order to determine if the software is activated.Client sent user data to the activation server in unencrypted/encrypted form. That doesnt matter. Sure it would be better encrypted at this point.The activation server check that data and then determine if the client can be activated.If the client can be activated then the server send the encrypted form of the license file.. but the problem appear now.. there is no way to deencrypt the file on the client if the private key isnt on the client which would be pretty insecure!
Export The DataTable Content In Encrypted Format To A File?
Nov 15, 2011Friends I want to try my hands on encryption/decryption. What I want is to export the dataTable content in encrypted format to a file. And when needed import back.
I am able to do the export import as XML file, but how to encrypt the data? Regards Pranabjyoti (If a post answers your query mark the post as answer)
Saving Multiple Arrays And Variables To Encrypted File?
Mar 29, 2011I'm looking to be able to save and load the content from multiple structured arrays and variables into/from an encrypted file, is there any reliable source of information or tutorial that I'd be able to use for this? I've never written a program in visual basic that writes to/reads from a file.
I'm using microsoft visual studio 2008.
Saving Text Directly As Encrypted File, Without Conversion
Nov 15, 2011I'm looking for a way to save text directly to an encrypted file, without saving it to a plain text file and encrypt this text file afterwards.
I don't care about the encryption type used as long as it is easy to implement and secure enough..
Verify If A File Exist On Host?
Oct 1, 2011I want to create a program that verify if a file on my host exist.Example: I have a button and if i click on, it verify if exist http://myhost.ro/test/test.txtAnd then if exist, textbox1.text = "The file exist " else textbox1.text ="the file don't exist ".. Can I create this program ?
View 17 RepliesEncrypt / Decrypt Xml File
Jun 22, 2011I need some help on saving/reading xml from/to dataset. I would like to make that complete file is encrypted and not only some elements inside or part of file.Currently this is not working in any way at all.[code]
View 14 RepliesEncrypt And Decrypt A File By Using VB?
Dec 23, 2011I ended up getting this properly working, as far as encrypting a file goes:How to encrypt and decrypt a file by using Visual Basic .NET or Visual Basic 2005 However, the catch is I have to change the name of the output file. What I was hoping to do is overwrite the original with the encrypted file, but when I tried that on a large file, it ended up only getting about 8 bytes of it.
Does anybody have any suggestions or recommendations? The overall idea is that I want to keep a file encrypted until it needs to be unencrypted for use by a program, but I'm not sure if there are better tools out there or if there's a better way of accomplishing this.
Question 2: I would really, really like to encrypt an entire folder, which I'm guessing would be faster than file by file, but when I try I keep getting access denied errors, even with DOS Cipher. Is there a way to do this with a key?
How To Crypt And Decrypt A File
Mar 17, 2010I give a file as parameter it crypts it with anything I don't really care if its safe or not I just want to person to not understand anything if he try's to read the file directly.so something like
[code]...
I want it to open the file, rechange it to the uncrypted value then close the file. I'm using serialization so it has to be able to crypt and decrypt anything serialization does.
Reason:
When I open the file the file serialized I can still see some text.I can still see some text. =]
VS 2005 File.encrypt And File.decrypt
Mar 12, 2010Has anyone used these methods? I tried File.Encrypt on a text file, and I did not get an exception, however the Encrypt method did not work (the file was unchanged afterwards).
View 3 RepliesEncrypt / Decrypt A Non-text File
Nov 12, 2009I am interested in knowing if non-text files like .xls/.xlsx or .doc files can be encrypted... From the Devlopers Guide on MSDN, I found code snippets that allow encryption / decryption of .txt files. This works absolutely fine. However, I would like to know if similar procedure can be used to encrypt/decrypt file other than .txt file.
View 1 RepliesEncrypt / Decrypt Text In File
Jun 21, 2010I have created a encryptor/decryptor that allows you to encrypt/decrypt text in a textbox, or a file. The basis of the system is to allow a user to thoroughly protect data within their system. Is there anyone that would be willing to test the program?
View 4 RepliesEncrypt And Decrypt Text File?
Jul 23, 2009I save data from datagridview to text file . I also load the same data from text file into datagridview for edit and update the same thing to text file. Now i want to make my Drill layer header.txt in encrypted format to prevent anyone to open that file and modify out of program. They only can modify it through the program How can we do like this?
My Drill Layer Header.txt file is like this
T240C3.175F012S27H2000
T239C0.95F034S55H1000
T236C1.2F029S48H2000
[code]....
This code can encryp the text file. But accrding to this code EncryptFile("c:\Drill Layer Header.txt", _ "c:\Drill Layer Header original1.txt", _ sSecretKey) It ask for input and output file. So it take data from Drill Layer Header then encrypt the save in drill layer header original.txt. I want it to take data from drill layer header and encrypt and save in same file.
Protect Exe File So On One Decrypt It And Use It Or Get Ccode?
Jun 3, 2010How do i protect my exe file so on one can decrypt it and use it or get ccode ?
View 4 RepliesVS 2008 Encrypt And Decrypt File?
Jun 16, 2009The same thing that happens when you compile a script it turns in a non-readable mode but when it's opened in the right editor it's back for editing like normal.But just so it encrypts and decrypts the textfiles just like I said before.
View 3 RepliesVS 2010 Encrypt/Decrypt File?
Jan 31, 2012I am after some code to encrypt/decrypt a file, with a feature to display theencryption/decryption process percentage.The following code works well for strings, but when I tried to use it on byte arrays, I get an out of memory error.
Public Function AESEncrypt(ByVal PlainText As String, ByVal Password As String, ByVal salt As String)
Dim HashAlgorithm As String = "SHA1" 'Can be SHA1 or MD5
[code].....
Error "File Opened That Is Not A Database File File Is Encrypted Or Is Not A Database" Accesing SQLite File
Oct 14, 2010[URL] to create my sqlite db file. I created it as a sqlite db version 3 file. When I go to open the connection
[Code]...
Error - Verify That The File Exists In Specyfic Folder
Apr 30, 2010git this login form, streamreader looks for a matching user name and password and everything seem to be ok until i run it. I'm getting this ERROR: "veryfy that the file exists in specyfic location" this is code:
Imports System.IO
Public Class Form1
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
[Code].....
Encrypt And Decrypt A Serialized Text File?
Aug 14, 2010For example I got this part of a method which serializes a textfile with a password and then encrypts it using the rijndael encryption method[code]...
View 8 RepliesEncrypt And Decrypt Connection String In XML File?
Mar 4, 2010I want to save my connection string in XML file.How to do that?How to encrypt and decrypt that file using VB.Net
View 2 RepliesEncrypt And Decrypt Text File Into Datagridview
Jul 23, 2009I save data from datagridview to text file . I also load the same data from text file into datagridview for edit and update the same thing to text file. Let say this text file i called as Drill.txt. I have another text file called header.txt which need to match its value with the value of Drill.txt file then overwrite value from Drill.txt to header.txt. Now i want to make my Drill.txt in encrypted format to prevent anyone to open that file and modify out of program. They only can modify it through the program How can we do like this?
[Code]...