Mr Travi
Royal Grammar School
No 1
The basic requirements
Input a password
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
Check each character of the password in turn
1)
2)
3)




4)
5)
6)
7)
8)
9)
10)
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
If 1 different character type is used then the password status is set to weak
i.e. if lower characters are greater than 1 and upper , numeric and punctuation
characters are less than
If 2 different character types are used then the password status is set to medium
If 3 different character types are used then the password status is set to strong
If 4 different character types are used then the password status is set to extra strong
List of passwords are stored in an array and results showing whether weak, medium, strong
or extra strong are displayed in a spreadsheet
Select a password to amend and change it
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
yes
Is it greater than 12 characters
No
Flow chart of the program
Output password
OK and write to
spreadsheet file
Is the character lcase or
lowercase ?
lowers =
lowers +1
yes
No
Set Counter, uppers,
lowers, numerics
Puncts to Zero
Yes
Uppers=
Uppers+1
Is the character ucase or
Uppercase ?
No
For each character in
password
Yes
Numbers =
Numbers + 1
Is the character Numeric ?
No
Is the character not
lcase or ucase or
numeric?
Yes
Punct = punct
+1
No
All characters checked?
Password status = uppers, l+
owers, numerics + Puncts
Output password strength
and write to file
Stop
REPEAT
INPUT the password
len=length of password
IF len <6 OR len >12 THEN
PRINT suitable error message
UNTIL len >=6 and <=12
PRINT password OK
Initialise upper, lower, puncts and number to 0
FOR i = 1 TO len
For Counter = 1 To Len(ValidPassword(howmanypasswords))
Select Case Asc(Mid(ValidPassword(howmanypasswords), Counter, 1))
Case 47 To 57
numerics = numerics + 1
Case 65 To 90
uppers = uppers + 1
Case 97 To 122
lowers = lowers + 1
Case Else
puncts = puncts + 1
End Select
Next Counter
If uppers > 0 And lowers > 0 And puncts > 0 And numerics > 0 Then
passwordstatus = "Extra Strong"
ElseIf uppers > 0 And lowers > 0 And numerics > 0 Then
passwordstatus = "Strong"
ElseIf alphas > 0 And (puncts > 0 Or numerics > 0) Then
passwordstatus = "Medium"
ElseIf uppers > 0 And lowers > 0 Then
passwordstatus = "Medium“
Else
passwordstatus = "Weak“
Endif
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 and Extra Strong identified:
Weak
Medium
Strong
Extra Strong
mrtravi
MRTRAVI
123456
MrTravi
Awerty
Zwerty
3werty
3WERTY
Q23456
qwe456
1w3r5y
QW345Y
QW34ty
12erTY
MrT:O521542
01mL;*&EWa
All lower / upper
case/ numeric:
weak reported
1 upper case, rest
lower, also test A
and Z accepted
Medium reported
All medium
strength
combinations and
With differing
quantities of
numbers and
letters
Both cases and
numeric used,
Strong reported
All lower / upper
case/ numeric/
punct:
Main program
Set up variables
Validpasswords() 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 has
Txtinput – 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 enter
I 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 into
Lblstrength 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 characters
All 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
strong
The 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.
Testing Section
Test
Data
Expected
Actual / Comment
To 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
Test
Data
Expected
Actual / Comment
To 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:O521542
and highlight password status
MrT:O521542
is displayed as extra strong
Test
Data
Expected
Actual / Comment
To 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
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 2
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