I'm writing an alphabet cipher that ciphers at random. It looks like it should work when I'm debugging it but when I look at the cipher key it comes out with duplicate letters like some of them weren't switched during the for loop. WasSwapped is used to keep track of whether the letters been used in the cipher already and alphabet is just a list of the alphabet in order. All arrays and lists are size 26.
[Code]...
Alot for the algorithm for Feistel cipher ( block ciphers ) but I did not find any . .
View 1 RepliesVigenere Cipher which I am trying to code in VB.Net. The main thing is to decrypt to plain text with keys provided. Currently, I did a small code to decrypt NIOZS to COMPU with the key LUCKY. This is done by storing the cipher text, the key text and the English alphabets in 3 different arrays each starting at index 0.
However, I do not know how to proceed on if my cipher text is longer. My cipher text file consists of texts in .txt, every 5 words are group together (e.g. NIOZS ECPQE TOGCG YMKQF E). The keys are all different in lengths. I also understand about checking letter frequency to deduce the key but I do not know from which point to start on.
Can anyone give me some pointers as to how I can get to start for my program? I tried looking for samples but some applets on the web wasn't exactly accurate or I can't start it up after I dl-ed.
I am writing the source code to write the random files name but I don't know how to write that in vb.net Here it is the
[Code]...
I am making a cipher solver in vb.net 2008 and I have made it solve ciphers for most ciphers but I can't make it do vigenere. I have got three textboxes named "EncryptionVigenere", "SolutionVigenere" and "Key" and a button called "SolveVigenere".
View 3 RepliesI'm trying to make a program (in VB 2008 Express Edition) that will take text (from a textbox) and then switch the letters (say a->f and A->F) and will put the result into a second textbox when I click a button. How do I code the program so that it will search through the textbox and find all of a certain letter (say a) and replace it, then search for the next letters (say b-z) and replace them?
View 4 RepliesI am trying to write a program to decrypt and encrypt the ceaser cipher or ceaser shift (which ever you prefer using), and I really need help I don't even know how to start. I am hoping that someone on here can atleast help me to get started with writing the program.
View 4 RepliesI 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 RepliesIm 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 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)
I am very new to vb.net, just wonder can I use vb.net to do something like this : I have alphabet from [A][B]...to [z]. When A is clicked, product name that start with "A" and it's price will shown in a table below.
View 1 RepliesI did this for one of my homework assignments in C#. However I need to do this in Visual Basic. For VB it just needs to be 6 characters and have one numeric digit and at least one alphabetic character.
Private Sub btnVerify_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnVerify.Click
public string getPassword()
End Sub
Private Function IsValid() As Boolean
[Code] .....
Need a function that will place letters in a cell consequatively in one column. starting over when z is reached
View 4 Replies