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隐写编码可以提高数据嵌入效率和隐写安全性。该文将原有的二进制游动隐写编码法推广为广义素数基游动编码。秘密信息首先表示为某一素数进制下的位序列,每一秘密数据位又用连续多个载体数据来承载。在此机制下,隐写时每修改一个载体数据值就可以隐藏多个秘密数据位,因此大大减少了对载体数据的修改量,即提高了嵌入效率。原有的二进制游动编码实际上是广义游动编码方法在素数基等于2时的特例。理论分析表明,在素数基取为3时可以获得最好的编码性能。
Steganography can improve data embedding efficiency and stealth security. In this paper, the original binary walk steganography is generalized to generalized prime base movement coding. The secret information is first expressed as a bit sequence under a certain prime number system, and each secret data bit is borne by multiple consecutive carrier data. Under this mechanism, multiple secret data bits can be hidden by changing one carrier data value in steganography, thereby greatly reducing the amount of modification to the carrier data, that is, improving the embedding efficiency. The original binary move code is actually a special case of generalized move code method when the prime number is equal to 2. Theoretical analysis shows that when the prime number is taken as 3, the best coding performance can be obtained.