Abstract: Meteorological images in the transmission process may be stolen and intercepted,and it leads to the data flow,which do harm to the country’s meteorological data security.Thus,encryption before the transmission and decoding after receiving is a safe and reliable way.Encryption method first separates the three layers of meteorological image R,G,B to reduce the correlation between the layers.Second,it combines DNA encoding and sine chaotic mapping to encrypt the meteorological images’ layers separately.This method has the advantage of parallel computation,so the speed of encryption and decryption is greatly improved.The algorithm has large key space,strong attack resistance,reversible encryption methods and it is also sensitive to initial value.Therefore,it can against a series of attacks safely and efficiently.Then,the method can meet our needs of safe meteorological image transmission.In the age of big data,this method solves the difficulties of traditional encryption and decryption technology.This method also can be applied to the encryption of gray or other common color images.However,due to the large amount of the taken meteorological images in every day,the number of images needs to be encrypted in the unit time is large.In other words,high speed encryption on the basis of security is needed.Thus this method is extremely suitable for the fields,which collect a large amount of image data,such as meteorology.And it also has great potential applications in the military,medicine and other image secure communication fields.

Key words: Encryption of meteorological images,DNA encoding,Sine chaotic mapping,Parallel computation,Key space,Efficient,Reversible,Military,Medicine