An encryption and decryption method applied upon transmitting a plaintext in a communication network containing plural subscriber ends is provided. A first end of the first part is adapted to connect to a second end of the second part, and a second end of the first part is adapted to connect to a first end of the second part to form a substantially circular cleat. Additionally, the liner provides for easy assembly with no flow path steps. in the measurement path, a burst signal in form of an envelope modulated pilot tone is added to the modulation of the light of the light source synchronously with the wavelength sweeps at a wavelength outside the interaction feature of the sample. The system also includes a server that stores data transferred from the information processing apparatus, and controls transferring data to the information processing apparatus based on a request for transferring data received from the information processing apparatus.