• How To Make Your Own Encryption


    ****UPDATE: DOWNLOAD THE PROJECT FILES****

    This video lays out the steps for creating a very simple encryption and decryption program using free tools. The programming language we will be using is VB Script.  See if you can decrypt this text:

    wkjlue#vnrro#huxwxi#uxr\

     

    The code below is for the encrypting program:

    <—–Start copying below this line—–>
    ‘SIMPLE VB ENCRYPTION PROGRAM
    ‘Create a dialogue box that asks for the text to encode
    set x = WScript.CreateObject(“WScript.Shell”)
    mySecret = inputbox(“Enter text to be encoded”)
    ‘Reverse the submitted text
    mySecret = StrReverse(mySecret)
    ‘Open up an instance of Notepad to print the results after waiting for 1 second
    x.Run “%windir%\notepad”
    wscript.sleep 1000
    x.sendkeys encode(mySecret)’This function encodes the text by advancing each character 3 letters
    function encode(s)
    For i = 1 To Len(s)
    newtxt = Mid(s, i, 1)
    newtxt = Chr(Asc(newtxt)+3)
    coded = coded & newtxt
    Next
    encode = coded
    End Function
    <—-Stop copying above this line——>
    <—–Start copying below this line—–>
    ‘SIMPLE VB DECRYPTION PROGRAM
    ‘Create a dialogue box that asks for the text to encode
    set x = WScript.CreateObject(“WScript.Shell”)
    mySecret = inputbox(“Enter text to be encoded”)
    ‘Reverse the submitted text
    mySecret = StrReverse(mySecret)
    ‘Open up an instance of Notepad to print the results after waiting for 1 second
    x.Run “%windir%\notepad”
    wscript.sleep 1000
    x.sendkeys encode(mySecret)’This function encodes the text by advancing each character 3 letters
    function encode(s)
    For i = 1 To Len(s)
    newtxt = Mid(s, i, 1)
    newtxt = Chr(Asc(newtxt)-3)
    coded = coded & newtxt
    Next
    encode = coded
    End Function
    <—-Stop copying above this line——>
    <—–Start copying below this line—–>
    –Applescript encryption program
    set words_to_encrypt to “I want to encrypt sentences. Not just words!”
    set multiplier to 5
    set charList to {“a”, “b”, “c”, “d”, “e”, “f”, “g”, “h”, “i”, “j”, “k”, “l”, “m”, “n”, “o”, “p”, “q”, “r”, “s”, “t”, “u”, “v”, “w”, “x”, “y”, “z”,”A”, “B”, “C”, “D”, “E”, “F”, “G”, “H”, “I”, “J”, “K”, “L”, “M”, “N”, “O”, “P”, “Q”, “R”, “S”, “T”, “U”, “V”, “W”, “X”, “Y”, “Z”, “1”, “2”, “3”,”4″, “5”, “6”, “7”, “8”, “9”, “0”, ” “, “~”, “!”, “@”, “#”, “$”, “%”, “^”, “&”, “*”, “(“, “)”, “_”, “+”, “{“, “}”, “|”, “:”, “\””, “<“, “>”, “?”, “`”, “-“,”=”, “[“, “]”, “\\”, “;”, “‘”, “,”, “.”, “/”, “a”}considering case
    –get a list of numbers for the words corresponding to the item numbers of the characters in charList
    set p_letter_list to text items of words_to_encrypt
    set p_num_list to {}
    repeat with i from 1 to (count of p_letter_list)
    set this_letter to item i of p_letter_list
    repeat with j from 1 to count of charList
    set this_char to item j of charList
    if this_letter is this_char then
    set end of p_num_list to j
    exit repeat
    end if
    end repeat
    end repeat
    –encrypt the numbers
    set modulus to count of charList
    set c_num_list to {}
    repeat with i from 1 to (count of p_num_list)
    set p_num to item i of p_num_list
    set c_num to ((p_num * multiplier) mod modulus)
    set end of c_num_list to c_num
    end repeat
    –get the characters for the encrypted numbers corresponding to the characters in charList
    set c_letter_list to {}
    repeat with i from 1 to (count of c_num_list)
    set this_item to item i of c_num_list
    set end of c_letter_list to (item this_item of charList)
    end repeat
    –coerce the encrypted characters into a string
    set c_string to c_letter_list as string
    end considering
    <—-Stop copying above this line——>
  • The Basics Of Video Encoding





    This video covers the basics of converting and encoding videos.