Abstract: Disclosed LTS strong password by convention systems include a password designation system, a portable password devices and other systems. Disclosed portable device include age-sensitive display systems to ensure that passwords and their replicas do not get forgotten or otherwise become stale. Portable devices include sophisticated electronics to commutate with a pet owner, including means of communication not requiring the use of a smart phone. Portable devices may include a base collar containing a microprocessor and other computer related components. Password rule engine support flexible password definition by means of pseudorandom expressions and may be adjusted as needed by an owner or subject systems. Disclosed device functions are executed by the disclosed portable devices and facilitate long-term password replication and policy-driven password maintenance.