A Selective Encryption Scheme for Audio and Video Based on the National Cryptographic Algorithm

doi:10.3969/j.issn.1671-1122.2023.11.006

Abstract

Abstract:

Aiming to address the current issues of imperfect encryption schemes based on national cryptographic algorithm in audio and video data, balancing encryption efficiency and security, this paper designed a selective audio-video encryption scheme within the TRTC audio-video architecture, based on national cryptographic algorithms. The scheme proposed an identity authentication mechanism combining password authentication and collaborative signature, tailored to the characteristics and requirements of audio-video applications. By analyzing the features of the SM4 algorithm and H.264 encoding method, the scheme employed SM4-CFB mode to encrypt key syntax elements such as IPM, MVD, and residual coefficients within encoded frames, achieving efficient selective encryption of audio-video data. Experimental results demonstrate that this approach effectively reduces encrypted data volume, enhances encryption speed, and maintains high levels of cryptographic security and perceptual security.

Key words: national cryptographic algorithm, selective encryption, audio and video data security, co-signature

CLC Number:

TP309

XU Shengwei, DENG Ye, LIU Changhe, TAN Li. A Selective Encryption Scheme for Audio and Video Based on the National Cryptographic Algorithm[J]. Netinfo Security, 2023, 23(11): 48-57.

Figures/Tables 14

References 21

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类型	国密算法	原理	对应国际算法
非对称加密	SM2	椭圆曲线的离散对数问题	RSA
杂凑	SM3	散列函数	Hash
对称加密	SM4	分组加密	DES、AES

密钥名称	密码算法	长度/bit	产生方式	用途
用户密钥对	SM2	128	云服务器密码模块产生	数字签名、数字信封
会议密钥	SM4	128	随机动态产生	数据流加密
分片密钥	SM2	128	随机动态产生	协同签名

Mb_type	类型名称	帧内16×16预测模式	码字
1	I_16×16_0_0_0	0	010
2	I_16×16_1_0_0	1	011
3	I_16×16_2_0_0	2	00100
4	I_16×16_3_0_0	3	00101
5	I_16×16_0_1_0	0	00110
6	I_16×16_1_1_0	1	00111
7	I_16×16_2_1_0	2	0001000
8	I_16×16_3_1_0	3	0001001
9	I_16×16_0_2_0	0	0001010
10	I_16×16_1_2_0	1	0001011
11	I_16×16_2_2_0	2	0001100
12	I_16×16_3_2_0	3	0001101
13	I_16×16_0_0_1	0	0001110
14	I_16×16_1_0_1	1	0001111
15	I_16×16_2_0_1	2	000010000
16	I_16×16_3_0_1	3	000010001
17	I_16×16_0_1_1	0	000010010
18	I_16×16_1_1_1	1	000010011
19	I_16×16_2_1_1	2	000010100
20	I_16×16_3_1_1	3	000010101
21	I_16×16_0_2_1	0	000010110
22	I_16×16_1_2_1	1	000010111
23	I_16×16_2_2_1	2	000011000
24	I_16×16_3_2_1	3	000011001

MVD	码字
1	010
-1	011
2	00100
-2	00101
3	00110
-3	00111

方案	加密元素	加密算法	格式兼容性
廉士国^[2]等人	全部数据	DES算法	不兼容
SPANOS^[3]等人	I帧	AES算法	不兼容
QIAO^[4]等人	I帧	异或运算	不兼容
袁志民^[5]等人	一半数据	SM4算法	不兼容
XU^[12]等人	IPM、MVD、T1s	Chaos	兼容
WANG^[21]等人	IPM、MVD	Hash、AES	兼容
CHENG^[18]等人	IPM、MVD、RC	Chaos、AES	兼容
本文方案	IPM、MVD、RC	SM2、SM4	兼容