A method, non-transitory computer readable medium, and apparatus that authenticates a user without personal information includes obtaining at a secure authentication computing apparatus a context identifier, a registration identifier of one of a plurality of string generator modules assigned to a client computing device requesting access, and a client string generated by the client computing device requesting access from an agent computing device associated with the client computing device requesting access. An authentication string is generated with the secure authentication computing apparatus based on the obtained context identifier and a corresponding one of the plurality of string generator modules provided to the client computing device requesting access based on the registration identifier. The requested access by the client computing device is granted with the secure authentication computing apparatus when the client string matches the authentication string.