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In this paper, we propose a fast and robust scheme for image encryption including a new chaotic generator. The proposed crypto-system uses a variable block cipher length (8, 128, and 512) with different modes: cipher block chaining (CBC), output feedback (OFB), cipher feedback (CFB) and counter (CTR). The fastness and robustness properties of our crypto-system are determined by the chaotic generator using a 32-bits finite precision with integer representation to facilitate hardware implementation, and by a keystream permutation using a 2D-cat map with chaotic control parameters. The chaotic generator is constructed with two non linear (the skew tent map) IIR filters. To quantify the security level of the proposed cryptosystem, we analyze the global dynamical properties of the chaotic generator using the NIST (National Institute of Standards and Technology) test, and we show that, the algorithm can resist the …