Banking-Grade Credential Stuffing: The Futility of Partial Password Validation
Recently when logging into one of my credit card providers, I was greeted by a familiar screen. After entering in my username, the service asked me to supply 3 random characters from my password to validate ownership of my account.
It is increasingly common knowledge in the InfoSec community that this practice is the antithesis of, what we now understand to be, secure password management.
For starters; sites prompting you for Partial Password Validation cannot store your passwords securely using algorithms like BCrypt or Argon2. If the service provider is ever breached, such plain-text passwords can be used to login to other sites where the account holder uses the same password (known as a Credential Stuffing attack).
Increased difficulty using long, randomly-generated passwords from Password Managers, leads to users favouring their memory over securely generated unique passwords. Those using Password Managers must extract their password from their vault, paste it somewhere else and then calculate the correct characters to put in. With this increased complexity, it further incentivises users to (re-)use simple passwords they can remember and count off on their fingers (and likely repeatedly use on other sites).
This is not to distinct thinking that originally bought us complex Continue reading
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