EXAMPLES: One startup, Qrypt, has intentionally foregone using any of the quantum resistant algorithms being considered, instead relying on a much older form of classical encryption called one-time pad encryption, to generate random numbers for encryption keys. Though it was first developed back in the 1940s, <cryptographers> and mathematicians believe this form of encryption is unbreakable and capable withstanding brute force attacks from a quantum computer, provided the parties never use the same key twice.