Complex passwords are hard to remember, so people often pick simple passwords, write complex ones down, and reuse the same password across multiple accounts. Proactive password checking (PPC) restrictions and mnemonic techniques can enhance password security and memorability. Participants in this study were assigned to one password generation group: PPC restrictions alone, image-based mnemonic technique, or text-based mnemonic technique. They were asked to generate and later recall passwords for five separate fictitious online accounts. The use of mnemonic techniques resulted in the generation of longer and more complex passwords. Furthermore, passwords were more accurately recalled when they were generated using the image-based mnemonic technique or PPC restrictions alone, as opposed to the text-based mnemonic technique. However, passwords generated using PPC restrictions alone were more easily forgotten and susceptible to being cracked. Thus, the image-based mnemonic technique was shown to be the most effective method for generating secure and memorable passwords.