Revise the following to avoid unnecessary there is/are and it is/was fillers.
1. There is a password-checker that can evaluate your password's strength automatically.
2. It is careless or uninformed individuals who are the most vulnerable to computer hackers.
3. There are computers in Internet cafes, at conferences, and in airport lounges that should be considered unsafe for any personal use.
4. A computer specialist told us that there are keystroke-logging devices that gather information typed on a computer, including passwords?