At first i thought it was the padding since mcrypt uses zero padding but i changed the php to use PKCS7 and get the same exact results.I think it has something to do with the padding in the php.Test output from .Net:
Key: d88f92e4fa27f6d45b49446c7fc76976
Text: Testing123
Encrypted: /DMkj7BL9Eu2LMxKhdGT+A==[code]......
I am using a slightly modified version of this code. to create a mission critical application. That files that will be encrypted are very important. This has to be done from scratch because there are some other things that has to be done along with this. How secure is this? Its impossible to crack this encryption right? [Code]
View 2 RepliesMy current approach of using Rijndael is to use a pair of static Key and Iv for all encryption operations (I mean I use this pair of Key and Iv for all protected files in my computer).
I heard that IV must be unique for each Rijndael encryption. Is that true? What is the problem (if any) for my current approach of using single static Key and Iv pair?
I use the following Rijndael code to do encryption without fail for many times. But why it can not encrypt an ISO file with 4.2 GB? In fact my computer has 16GB memory and it should not be a memory problem. I use Windows 7 Ultimate. The code is compiled as winform (.Net 4) using Visual Studio 2010 (a VB.NET project).
I have checked that the ISO file is OK and can be mounted as virtual drive and even can be burnt to DVD rom. So it is not the ISO file problem.My question: Why the following code cannot encrypt an ISO file with size of 4.2GB? Is that caused by the limitation of Windows/.NET 4 implementation?
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I'm creating a Rijndael file encryption application. I will using a unique IV for each file encryption.
My question: Where is the proper place to embed the IV info?
My initial thought is to append it at the end of the file's content. Is that a good choice?
I want it to do is that you input a string, then you select an algorithm (Theres only going to be one RijnDael) then you input a key, then the Initialization Vector comes from "txtIV.text" then you select the key bytes and the block bytes from the numeric up/down, then you either encrypt or decrypt.
View 1 RepliesI have set up a method in vb.net and in xcode for encrypting a string using as far as i can tell the same parameters for an AES encryption.I've looked all over the place but cannot find information on whether they use the same encryption algorithm and settings.
this is the vb.net code:
Dim encryptAES As New AesCryptoServiceProvider()
Dim encoding As New UTF8Encoding()
Dim encryptor As ICryptoTransform
encryptAES.Key = encoding.GetBytes("12345678901234567890123456789032")
encryptAES.IV = encoding.GetBytes("1234567890123416")
encryptAES.Mode = CipherMode.CBC
[Code]...
How to generate Rijndael KEY and IV using a passphrase? The key length must be in 256 bits.
View 5 RepliesI'm trying out the Rijndael to generate an encrypted license string to use for our new software, so we know that our customers are using the same amount of apps that they paid for.[code]...
View 3 RepliesI've attempted using code snippets as a test to encrypt a string, save it to a file & the reload it back, decrypting it. I consistently get a "Padding is invalid and cannot be removed." error on decrypting the string.
View 3 RepliesIm using Rijndael (as AES algorithm) for encrypting. I encrypt the values (objects properties) and serialize the object to xml an dsend the xml to the receiver via a web service. I want to pass along the encrypted symmetric key that I used to encrypt the data. But what key should I pass along?
My decryption algorithm looks like this (vb.net):
CODE:
If I want to decrypt the encrypted string I have to use both key and IV, but I think I have to pass along only a key value. Do I have to do this another way or what should I pass along? My specification says that the values have to be encrypted using AES and a 128 bits key.
I have spent quite a while trying to solve this problem.I would like to be able to decrypt a file using an old password, then encrypt the file with a new password in memory. I could easily write the unencrypted file to disk then encrypt the file with a new password, BUT I was trying to keep the unencrypted file from being written to disk. Could someone point me in the right direction?
Private Function ReEncryptFile(ByVal PathToFile As String, ByVal OldPassword As String, ByVal NewPassword As String) As Boolean End Function I've been using a cryptostream to decrypt the file, but I cant seem to figure a way to encrypt the crytostream afterwards (or convert it to a memorystream and (re)encrypt the memorystream)
What's the difference? I'm going to create a password encrypting program, and I wanted to know what's the basic difference about the managed class and the "not managed" class.
View 4 RepliesDo both of these algorithm work only with a 128bit size block size?
View 3 RepliesI recently have been developing a app that uses the rijndael encrypt and decrypt function it stores dates in the registry (encrypted with a key using the algorithm)
for example Dim strOldDay As String = Key.GetValue("UserSettings", "").ToString the key was made using a private function called "createkeys"
example:
dim current as currentdate
Current.Day = DateTime.Now.Day.ToString
Current.Day = Encrypt(pPassPhrase, Current.Day)
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I have a code to read and find match the same value of a text file.This is the code.
Imports System.IO
Public Class Form1
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As
[Code]...
I have two files like this
File one
[2 11.63 39.7] X7.705 Y0.735 209.037
Open -209.037
18N694 P321 117461, 50374 100MIL;
[code]...
what i need to do is from file 1 let say my line is like this
[2 11.63 39.7] X7.705 Y0.735 209.037
Open -209.037
18N694 P321 117461, 50374 100MIL;
from the line i must take P321 and match with my File2 if i find the mathing line like this
12N709 11.3611 4.9474 P321 L6 BOTTOM 100MIL 43-CHISEL X11.3611Y4.9474 1922 0
then i must take the value beside P321 which is L6 and write it in my original file like this
[2 11.63 39.7] X7.705 Y0.735 209.037
Open -209.037
18N694 P321 117461, 50374 100MIL; L6
How we can do this. To get the P321 from my file 1 can i use regex pattern like this P*[0-9]. And how to match the regex pattern with file 2 write the content ?
How to store fingerprint images in the vb.net and how to match it??"
View 1 Repliesis there anyway that I can convert this to use RSA encryption?
Imports System.Text
Imports System.Security.Cryptography
Imports System.IO
Public Class ClsEncryption
[code].....
I have been trying to create an app that will do xor encryption. I have tried a few different functions but none of them seem to give me what I want. I need it to put the coded text into a 7 bit ascii string. For example if the key was a - 1100001 and the text to be encrypted was s - 1110011 then it would return 0010010 as the encryption. One of the pieces of code I tried to use
Public Function XOREncryption(ByVal CodeKey As String, ByVal DataIn As String) As String
Dim lonDataPtr As Long
Dim strDataOut As String
Dim temp As Integer
[code]....
This returns a hex digit though which will not work for what I want.
have made a library for my vb.net project by combining 3 libraries (using ilmerge).
View 3 RepliesI am attempting to create a program that can do raw RSA encryption (performing the encryption without using 'Encrypt' and 'Decrypt') of a user's message that can contain a-z, A-Z, 0-9, and [,.;:'"()]. I've attached a screen shot of the application form.
Basically, the user will pick from a list of prime numbers from the first box and input them into p and q. They will type their message in the designated textbox and then hit <encrypt> which will encrypt using p and q and then show the encrypted message below. I'll leave out the Key box since that deals with the math behind the encryption.
The part I am stuck on right now is assigning a number to each one of the characters so that it can be encrypted. These numbers need to remain the same so that the message can be decrypted as well.
I have text like following example
XXZZXXXZXXZXXXXZZZZZZXVVVVVXZVZ
and also I have two patterns like XX and ZZ I want to find longest possible string which include above given two patterns and return starting and finishing index of the array.
In VB6 datacombobox there was a property that you could set that filtered the item list as you typed in the combo box (extended matching I think it was called) so that as the user typed more characters in the box the filtering progressively narrowed down the number of items in the list.The .net control does not seem to have this facility, or does it?Do we have to programatically do it now?
View 7 RepliesHave text file with two parts
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The upper part and the part after the line *+*+* Top *+*+*. What i must do is i must read the value in () at the Top part and compare that value with value in [] from upper part and write it side by side
This is my code so far:
Private Function GetLineMatch(ByRef LineToMatch As String, ByVal LineNumber As Integer, ByVal FileContents() As String) As String
Dim value As String = System.Text.RegularExpressions.Regex.Match(LineToMatch, "([d
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If u see the highlighted value are same. But from top part when it read (2 13.50 26.3)it only matches for one time the value in [2 13.50 26.3] so it take the first line and write and iqnore the second line.
I have text file with two parts
[code]...
If u see the highlighted value are same. But from top part when it read (2 13.50 26.3)it only matches for one time the value in [2 13.50 26.3] so it take the first line and write and iqnore the second line
i have 2 groups of text in my text file
Bottom
11.0 28 Red (2 13.10 04.0) [1 16.71 33.3] 130611 2948 229111 28275
6.5 28 Blue (2 03.00 03.0) [1 05.36 58.3] 132111 -67725 191611 -51225
2.0 28 Blue (1 05.36 45.3) [1 05.36 58.3] 211111 51225 210454 34691
[Code].....
In a table I have news posts with these fields:
Title
Content
OwnerID
The OwnerID relates to the ID in the users table, how can I get the name of the user who's ID matches the OwnerID? I'm writing a website in ASP.net (VB).
I am working on an application that llops through a dataset. Within each loop, I need to test to see if the datarow number is contained within an array. For example:For Each Page in Pages Test to see if page number is found in array (i.e. page number = 3, array = 1, 3, 4, 7, 8)Next Page The test would match on record numbers 1, 3, 4, 7, 8.
View 2 RepliesI have customer data in two different 3rd party apps that I need to organize into some reasonable data structure before making changes. I currently have two sub-classes of customer, one for each 3rd party app.[code]I need to map all instances of Customer1 to their respective Customer2s.I have an algorithm that has the logic to given an instance of Customer1 and a list of Customer2s find the appropriate match.Customers aren't the only data being matched between the two applications. I've also got two Item classes, two Payment classes, two Invoice classes, etc. Each of these classes has its own algorithm to match instances...I'd like to maximize the amount of reusable code. What is a good design pattern for matching portion?What data structure do I store a matched object pair in?
View 1 Replies