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To unpack a zip file protected by a pas*word, there is the brutal force attack. Of course, if you ask for the pas*word, it would be First, I will show basically how the brutal force attacks program work. Later on, I will try to improve a little bit the basic program. The brutal force attack consist or testing every possibilities to unlock a security. For our example, our zip file is protected by a pas*word. That pas*word could be anything: iloveyou, monkey1234, Sup3rMan, Sp0ck…. For education purpose, I will place a protected zip file at the end of this article. Of course, you could make your own protected zip If I want to test every possibility, I will sweep all possible combinations start from: 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, a, b, c, d…. 1a, 1b, 1c, 1d, … To the end of the world. The longer is the pas*word, the harder is. Also, the higher number of possible character there is, the harder In this example, I will create a generic collection of numbers and letter. I will name JETON.         Dim Jeton As Collection     Private Sub CreateTokenArray()         Jeton = New Collection         For index1 = 0 To 9 'les chiffres (numbers)             Jeton.Add(index1.ToString)         Next         For index1 = 97 To 123 ' lettres minuscules (lower case letters)             Jeton.Add(index1)         Next     End Sub I will use dotnetzip, an opensource librairie to test the pas*word:         Using zip As ZipFile = ZipFile.Read(aFilneme)             'just try to open the first file You need to loop thought over all possibilities. Here is the simple case for a pas*word length of 1 character. Private Sub LoopPas*word1()         Dim index1 As Integer         Dim sPas*word As String = String.Empty         Dim quitter As Boolean = False         quitter = False         While quitter = False ' to quit