混合加密的宋词载体文本信息隐藏技术

Text Information Hiding Technique by Carrier of Song Poetry Based on Hybrid Encryption

为进一步提高信息隐藏系统的安全性,提出基于混合加密的宋词载体文本信息隐藏方案。通过混合加密工具将原始信息经高级加密标准(advanced encryption standard,AES)进行加密,并使用椭圆曲线密码算法(elliptic curve cryptographic,ECC)对AES密钥进行加密,将加密后的密文和密钥经宋词文本信息隐藏技术进行隐藏,通过随机选择词牌模板(RTSA)或者指定单一词牌模板(STSA)的方式生成多篇宋词。该方案对100个汉字样本进行加解密平均时长为79.6 ms和33.3 ms,嵌入率最高达28.13%,与已有方案相比在嵌入率和隐蔽性上具有更大优势。同时,加密操作相当于对原始信息本身加入了随机噪声,即便信息隐藏系统被破解,攻击者也很难进行解密还原。由于生成的隐写宋词与原始宋词相差无异,攻击者难于进行隐显分析,更难于获得隐藏的信息,安全性得到了大幅提高。

To further improve the security of information hiding system,we put forward a secure text information hiding scheme with Song Poetry based on mixed encryption in this paper. It encrypts the original information with the advanced encryption standard （AES）, and then uses elliptic curve cryptography （ECC） to encrypt AES keys. Finally, it uses the Song-Steg to hide the encrypted cipher text and keys, and then generates some Song Poetries with a randomly selected or a specified Ci-Pai template. The average encryption and decryption time for 100 Chinese characters are 79.6 ms and 33.3 ms,and the embedding rate is up to 28.13%. Compared with the existing scheme,it has more advantage in the embedding rate and the concealment. Thus the encryption operation is equivalent to the original information itself joined the random noise. Even if the information hiding system be cracked, attackers are hard to decrypt reduction. For generated steganography Song Poetry is identical with the original one,it is difficult for an attacker to steganalyses and get the embedded information extremely, and the se- curity has been substantially improved.