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To address the problem of privacy protection in satellite communication, according to the proposed new three-dimensional chaotic system, this paper achieves the concealment of picture information by one-dimensional index scrambling and encryption operation in QPSK modulation for 24-bit true color pictures and completes the reception and decryption of ciphertext picture data and recovery of picture information at the receiver side. Through the simulation of the encryption algorithm, it is proved that the encryption system has better encryption than the classic logistics chaos encryption system and has the ability to resist statistical analysis attack, differential attack and noise interference. The whole image encryption system is implemented on FPGA, which proves its great potential for future application in satellite communication.

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