VS 2008 Making Own Encryption Alphabet?
Feb 3, 2010Im wanting to make my own alphabet for my encryption, ex:
[Code]...
Etc. What is the best way to do this and it make it as encryption?
Im wanting to make my own alphabet for my encryption, ex:
[Code]...
Etc. What is the best way to do this and it make it as encryption?
we're doing a hangman game in VB 2008 and we are using an input box to enter a word that will be stored in the variable "word".How do I set it that the input box will only except letters of the alphabet. We are dealing with manipulating strings in class.I tried using the KeyPress event but that failed miserably.
View 13 RepliesI'm trying to create a program which accepts a letter of the alphabet. For each letter a corresponding word beginning with that letter should be output, e.g., �a� or �A� input would give Alpha as the output, �b� or �B� would give Bravo and so on to �z� or �Z� giving Zulu.So if the user enters: "abc" for example, what should happen is a list on the right of the window appears with the words starting with those letters when the user presses calculate.I don't have any code apart form the basics below.
Public Class Form1
Private Sub TextBox1_TextChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles TextBox1.TextChanged
End Sub
[code]....
I 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]...
Quote:
Originally Posted by kleinma
Encryption would work fine, so long as it is symmetrical and done prior to storing the info in the setting, and decrypted after reading the setting back in.
The key or iv for the encryption (which is a series of bytes) could be generated from a user defined password, making it so the key used to decrypt is never stored even in the compiled application. Only providing the main password would provide the key to decrypt the data, limiting the attack surface to pretty much just brute force dictionary attacks.
I think that is probably a bit beyond the scope of this question though, he probably needs to start just saving and recalling data properly.
How would one go about doing this? I've read a little about encryption and I even have a demo program, I just don't understand the overall process of this. (I included the OP in the topic's title because it was his idea, and he might be able to explain it the best).
I am making a Gmail notification program that handles multiple accounts.The user will, obviously, have to input their authentication information for each email account so that the program can save it to login to Gmail with.
What is the best way to encrypt something like that since this information will have to be saved in their harddisk?
I want to try and use the new encryption algorithms provided with .NET 3.5. Any links or examples for how to use one of them to encrypt xml content?
As written on msdn site is:
The following algorithms are included:
Advanced Encryption Standard (AES) with key sizes of 128 and 256 bits for encryption.
Secure Hash Algorithm (SHA-256 and SHA-384) for hashing.
Elliptic Curve Digital Signature Algorithm (ECDSA) using curves of 256-bit and 384-bit prime moduli for signing. This algorithm is provided by the ECDsaCng class. It allows you to sign with a private key and verify with a public key.
Elliptic Curve Diffie-Hellman (ECDH) using curves of 256 and 384-bit prime moduli for key exchange/secret agreement. This algorithm is provided by the ECDiffieHellmanCng class.
Alright I am trying to make a little login system with encryption. I am trying to see if the user entered in there encryption key, if they did then they can input there account. Same thing with the password textbox. If they already entered in there encryption key then let them type in there password. I am trying to make it so if there text in encryption key then let them type in there account or if they didn't then let them put it in then let them type in there account.
Dim AccountInfo As String
Dim PasswordInfo As String
Dim EncryptionKey As String
'account textbox
[Code] .....
I am currently working on a simple data encryption program in VB 2008 express. Basically, I want the user to be able to select any file type and the program will read the data and store it in a text box. The user would then input a key, push the encrypt button and the program would XOR each byte of data with each character from the key and store the data in the third text box. I have written a program that has similar functionality only, it will not read from files, it simply reads data from a text box, so I have a encryption algorithm that works.Here is my
[Code]...
I'm a complete beginner to programming alone, let alone VB.net. What I need to do is encrypt a block of text inputted by a user using a keyword that will also be inputted by the user. This is all to be done using ciphertext, so naturally the user would be informed the keyword can not have any repeating characters. I figure the English alphabet will be predefined in capitals and lowercase, then the keyword will be read character by character, removing those characters from the alphabet array and then appending them to the end of it (to create the new encrypted alphabet). How to read the keyword character by character, and then removing the corresponding letter from the alphabet. The best I can think is to check each character of the keyword against each character of the array which I'm sure is much more work than I need to do.
View 1 RepliesThis seems like it would be so simple and fast, but I cannot figure out how to accomplish it in VB since there aren't many bit functions. I want to take a file and append 5 junk bits at the beginning and 3 junk bits at the end. In essence, just add 1 byte to the file, but in the process offset all the current bits so the file is no longer readable.
I just need a very simple encryption/decryption, but it needs to be very fast as well. I try XORing the bytes, but it gets slow with just a 1MB file. Some of the files are going to be close to 10MB.
If I'm not mistaken PHP crypt() function use DES-based encryption algorithm. So I've search DES Encryption code and all that I found is code that similar to the one in this post http://www.vbforums.com/showthread.php?t=471798
But with those codes I must enter 8 character lenght salt. Less then that the code wouldn't succeed. In the other hand. The PHP crypt() function only could use 2 character length salt. If you enter more than that, it seems it only use the first 2 character..[URL]
I wanted to basically rearrange the alphabet with a keyword infront as I am doing a simple substitutional cipher. I have kind of worked out the logic of doing that but I am a bit stuck on the coding side.
What I wanted was something like:Dim key = "keyword"
For i = 0 to 26
'insert keyword and put in A to Z after without duplicating characters
Next
'output: keywordabcfghijlmnpqstuvxz
Randomize()
Dim Alpha() As Char
Alpha = New Char() {"A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M", "N",
[code].....
in vb6 we use this command to disable alphabet sensitive option compare text (for example:
option compare text
dim baby as string
baby=inputbox("")
[code]....
in vb.net how can i do this ( without using Lcase and Ucase)
What is the fastest way to enumerate the letters of the alphabet? Anything built into the framework?[code]...
View 3 RepliesQuickest way to enumerate the alphabet in C#
Because I need to get all the characters of the alphabet OF AN ARBITRARY (variable) LANGUAGE, and that in the correct ordering sequence.
How can I do that without knowing the alphabet of every possible culture/language? System.Gobalization.Cultureinfo for example has information on date format, and a sorting method, and codepage info. But not info on the alphabet itselfs. Forthermore 'A' to 'Z' ordering iterating won't do, because German for example has characters such as ÄÖÜ, which are after 'Z' in the codepage numbering, but follow after aou when sorting.
Can I somehow use the codepages to get all the characters, and sort them somehow ? By 'all the characters' I mean all letters, including numbers, but not punctuation marks. And possibly only upper XOR lowercase.
I want to know how the code that suitable to draw the alphabet using a tracing..
View 1 Repliesow do i check for validation for my username field if last letter must be an alphabet?
the username is in the format of 7digit + alphabet i had successfully check for the first 7 digit using isnumeric substring 0,7 but i have no idea how to check my 8th letter to be alphabet a-z etc
How can I loop through letters of the alphabet using VB.Net?
View 3 RepliesPassword should allow min one numeric, min one alphabet and min one special char
View 2 RepliesUsing visual basic, I have a string. Want to check that the string contains a single, capital alphabetic character followed by a period. Tried to use Contains as in the following:
someString.Contains("[A-Z].") but this didn't return me what I wanted.
Also need to check for a single number followed by a period.
How can I do this in Visual Basic
I want to validate my textbox so that a user can only add letters of the alphabet and not anything else. so far the code that I have allow alphabetic entries but does not allow to delete and backspace[code]...
View 9 RepliesI would like to click next to go to another image in a picturebox but I only have one picture box setup to have the new letter displayed in it. I have 26 images to display and need to know how to setup a loop to go through each image? It seems simple but I cannot figure out how to get to the third image, it only goes to the second image and stops. I also need to know how to setup the back button to display the prior image in a picture box.
View 8 RepliesI need to generate a loop that would iterate through each capital letter of the alphabet using Visual Basic (2008). What's the cleanest way to do this?
View 4 RepliesHow can I search for record(s) started with alphabet entered e.g all data that starts with A using parameter with sql dbase..Neter
View 6 RepliesI want all my textbox in a form to allow only alphabets,no other characters.I can do this with only one textbox at a time.Is there a way to do it for 10 textbox at a time.[code]
View 6 Replieshow to validate a text box to accept only alphabets and numbers. no special characters. in vb.net i have tried the following code but it doesn't allow numbers but it allows alphabets only
Private Sub TextBox2_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles TextBox2.KeyPress
If (Microsoft.VisualBasic.Asc(e.KeyChar) < 65) _
Or (Microsoft.VisualBasic.Asc(e.KeyChar) > 90) _
And (Microsoft.VisualBasic.Asc(e.KeyChar) < 97) _
[code]....
how to check if the user enter alphabet in textbox the only allow in that textbox is number
i think i will use ascii there like in vb 6.. but i dont know how to done in VB 2008..?
i want to validate my textbox so that a user can only add letters of the alphabet and not anything else. so far the code that I have allow alphabetic entries but does not allow to delete and backspace
e.Handled = Not Char.IsLetter(e.KeyChar)