It also lacks what you might call &#x27;forward secrecy&#x27;. If someone gets access to my master password and an old 1password backup, then they get all the passwords in the backup.<p>But with this, if someone gets access to my master password, they get access to recent passwords, and when I create new passwords they get access to those too. If I&#x27;m not aware that my master password has been compromised (why should I be?) then I&#x27;d be merrily creating new passwords that are compromised at the moment of their creation.<p>Don&#x27;t roll your own crypto, kids.