Mr TraviRoyal Grammar School

No 1

The basic requirements1) Input a password 2) Is the password between 6 and 12 characters long

No reject and return to Stage 1 Yes output message and write the password to the spreadsheet file

3) Check each character of the password in turn Is the character lower case if yes add 1 to the lower character counter Is the character upper case if yes add 1 to the upper character counter Is the character a number if yes add 1 to the numeric character counter Is the character non numeric or text if yes add 1 to the punctuation character

counter

4) If 1 different character type is used then the password status is set to weaki.e. if lower characters are greater than 1 and upper , numeric and punctuation characters are less than

5) If 2 different character types are used then the password status is set to medium

6) If 3 different character types are used then the password status is set to strong

7) If 4 different character types are used then the password status is set to extra strong

8) List of passwords are stored in an array and results showing whether weak, medium, strong or extra strong are displayed in a spreadsheet

9) Select a password to amend and change it10) Search a password from within the array and replace it

Flow chart of the program

Start

Input a password

Is it greater than 6 characters

NoIs it greater than 6 characters

Is it greater than 12 characters

yes

Flow chart of the program

Output password OK and write to spreadsheet file

Set Counter, uppers, lowers, numerics Puncts to Zero

For each character in password

Is the character lcase or lowercase ?

lowers = lowers +1 yes

No

Is the character ucase or Uppercase ?

Uppers= Uppers+1 Yes

Is the character Numeric ?

Numbers = Numbers + 1

Yes

Is the character not lcase or ucase or numeric?

Punct = punct + 1

No

No

Yes

All characters checked?

No

Password status = uppers, l+ owers, numerics + Puncts

Output password strength and write to file

REPEATINPUT the passwordlen=length of passwordIF len <6 OR len >12 THEN PRINT suitable error messageUNTIL len >=6 and <=12PRINT password OKInitialise upper, lower, puncts and number to 0FOR i = 1 TO lenFor Counter = 1 To Len(ValidPassword(howmanypasswords))Select Case Asc(Mid(ValidPassword(howmanypasswords), Counter, 1))Case 47 To 57numerics = numerics + 1Case 65 To 90uppers = uppers + 1Case 97 To 122lowers = lowers + 1Case Elsepuncts = puncts + 1End SelectNext CounterIf uppers > 0 And lowers > 0 And puncts > 0 And numerics > 0 Thenpasswordstatus = "Extra Strong"ElseIf uppers > 0 And lowers > 0 And numerics > 0 Thenpasswordstatus = "Strong"ElseIf alphas > 0 And (puncts > 0 Or numerics > 0) Thenpasswordstatus = "Medium"ElseIf uppers > 0 And lowers > 0 Thenpasswordstatus = "Medium“Elsepasswordstatus = "Weak“Endif

Stop

We need a test strategy to use during development to show that the solution works at each stage. Requirement: 6- 12 characters

Less than 6 6 exactly >6 and <12

12 exactly More than 12

MrTra MrTrav MrTravi MrTravirocks MrTraviuiopasd

5 characters should be rejected

6 characters, boundary, should be OK

7 characters, valid input should be OK

12 characters, boundary, should be OK

13 characters should be rejected

Weak Medium Strong

Extra Strong

mrtraviMRTRAVI123456

MrTravi AwertyZwerty

3werty3WERTYQ23456qwe4561w3r5yQW345Y

QW34ty12erTY

MrT:O52154201mL;*&EWa

All lower / upper case/ numeric:weak reported

1 upper case, rest lower, also test A and Z acceptedMedium reported

All medium strength combinations andWith differing quantities of numbers and letters

Both cases and numeric used, Strong reported

All lower / upper case/ numeric/ punct:

Weak, Medium, Strong and Extra Strong identified:

Main program

Set up variablesValidpasswords() is an array where the passwords entered by the user and written after they have passed a length test. This is a dynamic array and the results of this are written to the spreadsheet file Password status records the results of the processing of the program to determine whether the password is weak, medium, strong or extra strong User Interface

The user interface hasTxtinput – a textbox to allow the user to enter the password. In the properties I have set the passwordchar property to * to mimic the entry of passwords The sub here updates each time a character is entered and outputs the number of characters that the password contains and what the status of the password being entered. For example

This shows what happens when just 2 characters have been entered the message displays ‘too short

Here 7 characters have been entered and the password length is OK

Here 14 characters have been entered and the password length is too long

The user interface has a label where the length of the password is displayed and the status of the password as it is enterI have used several command buttons

CmdOk executes the main part of the program CmdStartAgain will allow the user to reinitiate the program and toe enter the password again CmdBonnet allows the user to say statistics about the password that has been entered, how lcase, ucase, mumeric and punctuation characters have been uesd CmdBack makes the cmdbonnet visuble and lblstatus.visible property set to false

Lblstatus – 0nce the password has been accepted as valid the lblstatus label is set to visible and the password is displayed over the top of the text box where the password was entered intoLblstrength the password status is displayed in this label.

I have entered a 5 character password and pressed CMDOk and invalid password has been returned

This initialises the array to make the array value equal to the number of passwords entered + 1

I have enclosed here with the program some main pseudocode. Msgbox txtinput.text displays a message and can help in the testing process

The sub accumulator can only run if the function which I have created lengthOk is true. Within the function there are 2 locally defined variables atLeast6long and max12long which have to be true for the function I have created to be true

The accumulator module

This sub checks how many of each type of character appear in the password. The character is converted into its ASCII value 47 – 57 – numeric characters 65- 90 – lower case characters 97 – 122 Upper case charactersAll other ASCII characters are counted as punctuation marks

The sub calculates the value of the character for each password and adds up the total number of lower, upper, numerical and punctuation characters.

The password strength is processed using a nested if statement to work out if the password is weak, medium, strong or extra strongThe results of the program are written to the lblbonnet,caption and written to the sheet

This part of the sub writes the numbers of lowers, uppers, numeric and puncts to the sheets and the status result is written there

Howmanypasswords is a function created using a function with the spreadsheet and courting up how many entries are recorded in column A when the results of the program are being processed and written to

When the form is activated the sub init is initialised

This sets up the initial values and loads them into the variables

This loads the passwords into the array and writes the password to the spreadsheet file. The counter is set to the number of passwords already stored in the array.

This sub searches through the array to see if a password is in the array and then displays it.

Test Data Expected Actual / CommentTo see what happens when there are less than 6 characters

mrtra Should be rejected Was rejected

To see what happens if 6 characters are used

mrtrav Should be accepted and processed as weak

Accepted and processed as weak

To see what happens when 7 characters are used

mrtravi Should be accepted and processed as weak

Accepted and processed as weak

Testing Section

Test Data Expected Actual / CommentTo see what happens when all numeric characters are used

521423 Should be accepted and status should be processed as weak

Was accepted and processed as weak

To see what happens if 7 characters including a capital letter are used

Mrtravi Should be accepted and processed as medium

Accepted and processed as medium

To see what happens when a number and capital letters are used

3WERTY Should be accepted and processed as medium

Accepted and processed as medium

Testing Section

To see what happens when a combination of lower case , uppercase and numeric characters are used

QW34ty Should be accepted as strong

Accepted and processed as strong

To see what happens when a combination of lower , upper case, numerical and punctuation characters are used

MrT:O521542

Should be accepted and processed as extra strong

Accepted and processed as extra strong

To perform a search through the array holding the passwords records

Record 2 Should display the password MrT:O521542and highlight password status

MrT:O521542is displayed as extra strong

Test Data Expected Actual / CommentTo change a password held in the array

mrtravi To change mrtravi to mrtravirocks

Password was changed

Test 1 I have entered mrtra as a password with 5 characters this has been rejected

Test 2

I have entered mrtrav as a password with 6 characters this has been accepted and the status accepted as weak as this used all lower case characters

Test 3

This shows that the password has been accepted and written to the spreadsheet Test 4

The counts all the numeric characters and processes the password status as weak

Test 5

Here 1 capital letter and 6 lower case letters have been used and the password status has been processed as medium as expected Test 6

This combination of uppercase letters and numbers has returned a medium password classification

Test 7

I have used here a combination of 2 uppercase, 2 lowercase letters and 2 numerical characters and this has returned a strong password

Test 8

I have used a combination of 2 uppercase, 2 lowercase letters, numerical and punctuation characters which as returned an extra strong password

Test 9

Test 10 First has to search for record mrtravi

Record located

Password has been successfully searched and amended