Letter by Letter Comparison

[Novice2006]

Hi all

I understand this is sort of a silly to some even a stupid question I was wondering how would you do a letter by letter comparison. If you were making a

password program.

Thank you.

[crelf]

I understand this is sort of a silly to some even a stupid question I was wondering how would you do a letter by letter comparison. If you were making a password program.

Like you're checking if the password input by the user equals a constant in your code? You can use the "add" primative - it's polymorphic (which means it can adapt to different datatypes, including strings).

[Christian_L]

Hi all

I understand this is sort of a silly to some even a stupid question I was wondering how would you do a letter by letter comparison. If you were making a

password program.

Thank you.

• Use String Length to determine the number of letters in each password.
• Then use String Subset inside of a For Loop to extract each letter from each password.
• Then use Equal? to compare them. You can use the To Lower Case to make your comparison case independent, but you normally don't want that with passwords.

[Aristos Queue]

Use the Type Cast primitive to cast your strings to an array of uInt8. Then you can compare each element.

[Ton Plomp]

From a security point, it is very bad to compare the actual passwords.

Take an MD5 checksum of the (valid) password and compare this with the MD5 checksum of the entered password.

By storing the checksum you have an authentication method that does not store the actual password.

This is for instance done at the CR Class Object.

What is the reason to compare the passwords letter by letter?

Ton

[Novice2006]

The reason for comparing the password letter by letter is when someone is setting the password you confirm to make sure they didn't mistype the first time.

SO i thought i was done letter by letter.

[JustinThomas]

Add a Value change event for your string control. In this event compare the control value with the stored constant using the equal to operator.

You would also be required to right click on the string control and select 'Update while typing'. This ensures that the value change event would fire every time you make a change in the string control