In contrast with almost all existing chaos communication techniques which are based on synchronization, we propose a communication system, whose principle relies on stochastical properties of chaotic signals. A key issue of this approach is that different chaotic systems can possess different auto-correlation functions (ACFs). We discuss how these properties can be exploited in order to detect on the receiver side, whether a certain chaotic signal is 'on air' or not. Thus, we describe a binary communication system, which possesses some common properties of conventional spread spectrum techniques since chaotic signals behave 'noise-like' and occupy an entire frequency band. Like conventional spread spectrum techniques the proposed chaos communication system allows multiple users to share the same band and it is also robust to channel influences. The motivations of using chaotic, nonrepeating carrier signals are: (1) the transmission possess a higher level of security than techniques using periodical carriers. (2) In contrast with conventional spread spectrum techniques neither acquisition nor tracking units are necessary for detection. (3) We expect less interference problems between different channel users.