For services using standard protocols, you can use software for OTP (google authenticator is the most famous example and uses TOTP/HOTP). Edit: I might have mi

For services using standard protocols, you can use software for OTP (google authenticator is the most famous example and uses TOTP/HOTP). Edit: I might have misunderstood your question. What you can easily store for TOTP/HOTP is the seed. After that you need a software to compute the dynamic codes.