收稿日期: 2018-01-31
网络出版日期: 2018-03-31
基金资助
国家自然科学基金（No.61100239）；陕西省自然科学基金（No.2011JQ8009，No.2016JM6065）；中央高校基本科研业务费基金（No.GK201402036，No.GK201703057）资助
Coverless Test Paper Disguise Combined with Non-direct Transmission and Random Codebook
Received date: 2018-01-31
Online published: 2018-03-31
针对传统搜索式无载体信息隐藏方法存在的信息隐藏容量小、需构建和维护大文本或图像数据库以及搜索代价高等问题，提出一种结合非直接传输和随机码本的无载体试题伪装方法.首先通过伪随机序列对码本置乱，然后利用置乱后码本索引对秘密信息伪随机编码以避免秘密信息直接信道传输；其次将编码后索引位置转换为32进制数序列并进一步通过24进制与9进制数序列进行表达；最后将序列中每个24进制和9进制数分别通过随机生成的选择题排列顺序编号以及填空题答案随机相对偏移量进行间接表达以产生随机试题.同现有方法相比，所提方法避免了秘密信息直接信道传输，采用含密试题生成的方式来避免对额外载体修改且所提方法无需构建和维护大数据库也无需搜索，隐藏容量高且只能通过正确密钥才能对秘密信息进行恢复.
陆海, 邵利平 . 结合非直接传输和随机码本的无载体试题伪装[J]. 应用科学学报, 2018 , 36(2) : 331 -346 . DOI: 10.3969/j.issn.0255-8297.2018.02.012
In traditional no-embedding, search-based coverless information hiding methods, there exist some shortages such as small capacity, requiring or maintaining a large database about texts or images with a high search cost. To address these problems, a coverless test paper disguise method combined with non-direct transmission and random codebook is proposed. Firstly, to avoid direct transmission of secret information, secret information is coded by random codebook which has been scrambled by pseudo-random sequence. Secondly, the coded secret information is converted into 32-decimal digit sequence and further expressed by 24-decimal and 9-decimal digit sequences. Finally, each 24-decimal and 9-decimal digits in these two sequences are disguised by the key based random offsets relative to option arrangement order in choice question and answer of blank-flling question respectively in a random generated test paper. Comparing with the existed methods, the proposed method avoids the direct transmission of secret information and does not require extra carrier modifcation by introducing direct stego test paper generation. The proposed method does not require a large database, not require any search cost. It depends on the correct key to obtain transmitted secret information with a high hiding capacity.
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