前语Ⅲ!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!导言Ⅳ!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!１范围１!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!２规范性引证文件１!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!３术语和定义１!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!３．１术语１!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!３．２定义２!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!４缩略语和符号３!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!５电码本（ＥＣＢ）模式３!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!５．１变量定义３!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!５．２ＥＣＢ的加密方法描绘３!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!５．３ＥＣＢ的解密方法描绘４!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!６密码分组连接（ＣＢＣ）模式４!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!６．１变量定义４!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!６．２ＣＢＣ的加密方法描绘４!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!６．３ＣＢＣ的解密方法描绘４!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!７密码反应（ＣＦＢ）模式５!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!７．１参数定义５!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!７．２变量定义５!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!７．３ＣＦＢ的加密方法描绘５!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!７．４ＣＦＢ的解密方法描绘６!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!７．５建议６!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!８输出反应（ＯＦＢ）模式７!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!８．１参数定义７!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!８．２变量定义７!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!８．３ＯＦＢ的加密方法描绘７!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!８．４ＯＦＢ的解密方法描绘８!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!９计数器（ＣＴＲ）模式８!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!９．１变量定义８!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!９．２ＣＴＲ的加密方法描绘８!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!９．３ＣＴＲ的解密方法描绘９!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!１０分组连接（ＢＣ）模式９!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!１０．１变量定义９!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!１０．２ＢＣ的加密方法描绘９!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!１０．３ＢＣ的解密方法描绘１０!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!１１带非线性函数的输出反应（ＯＦＢＮＬＦ）模式１０!!!!!!!!!!!!!!!!!!!!!!１１．１变量定义１０!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!１１．２ＯＦＢＮＬＦ的加密方法描绘１０１１．３ＯＦＢＮＬＦ的解密方法描绘１１!!!!!!!!!!!!!!!!!!!!!!!!!!!!附录Ａ（规范性附录）工作模式的性质１２!!!!!!!!!!!!!!!!!!!!!!!!!Ａ．１电码本（ＥＣＢ）工作模式的性质１２!!!!!!!!!!!!!!!!!!!!!!!!!!Ａ．２密码分组连接（ＣＢＣ）工作模式的性质１２!!!!!!!!!!!!!!!!!!!!!!!Ａ．３密码反应（ＣＦＢ）工作模式的性质１３!!!!!!!!!!!!!!!!!!!!!!!!!Ａ．４输出反应（ＯＦＢ）工作模式的性质１４!!!!!!!!!!!!!!!!!!!!!!!!!Ａ．５计数器（ＣＴＲ）工作模式的性质１４!!!!!!!!!!!!!!!!!!!!!!!!!!Ａ．６分组连接（ＢＣ）工作模式的性质１５!!!!!!!!!!!!!!!!!!!!!!!!!!Ａ．７带非线性函数的输出反应（ＯＦＢＮＬＦ）工作模式的性质１５!!!!!!!!!!!!!!!!附录Ｂ（资料性附录）工作模式举例１７!!!!!!!!!!!!!!!!!!!!!!!!!!Ｂ．１概述１７!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!Ｂ．２ＥＣＢ方法１７!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!Ｂ．３ＣＢＣ方法１７!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!Ｂ．４ＣＦＢ方法１８!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!Ｂ．５ＯＦＢ方法１８!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!Ｂ．６ＣＴＲ方法１８!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!参考文献２０

(Preface III!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! Introduction IV!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!1 Scope 1!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!2 Normative Citation 1!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!3 Terms and Definitions 1!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!3.1 Terminology 1!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !3.2 Definition 2!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! 4 Abbreviations and symbols 3 !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! 5 Code Book (ECB) Mode 3!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!5.1 Variable Definition 3!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!5.2 Description of the encryption method of ECB 3!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!5.3 Decryption method description of ECB 4!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! 6 Cipher block connection (CBC) Mode 4!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! 6.1 Variable Definition 4!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!! 6.2 CBC encryption method description 4!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!! 6.3 CBC decryption method description 4!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!7 Password Response (CFB) Mode 5!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! 7.1 Parameter Definition ５!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! 7.2 Variable Definition 5!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!7.3 Description of the encryption method of CFB 5!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!7.4 Decryption method description of CFB 6!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!7.5 Recommendation 6!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! 8 Output Response (OFB) Mode 7!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!8.1 Parameter definition 7!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!8.2 Variable Definition 7!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! 8.3 Description of the encryption method of OFB 7!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! 8.4 Description of the decryption method of OFB 8!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!! 9 Counter (CTR) Mode 8!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!! 9.1 Variable Definition 8!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!9.2 CTR encryption method description 8!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! 9 .3 Decryption method description of CTR 9!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! 10 Packet Connection (BC) Mode 9!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!! 10.1 Variable Definition 9!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!! 10.2 BC encryption method description 9!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!10.3BC Decryption method description 10!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! 11 with non- Output Response of Linear Function (OFBNLF) Mode 10!!!!!!!!!!!!!!!!!!!!!! 11.1 Variable Definition 10!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!! 11.2 Description of encryption method of OFBNLF 1011.3 Description of decryption method of OFBNLF 11!!!!!!!!!!!! !!!!!!!!!!!!!!!! APPENDIX A (NORMAL APPENDIX) NATURE OF WORK MODE 12!!!!!!!!!!!!!!!!!!!!!!!! !!!A. 1 The nature of the working mode of the code book (ECB) 12!!!!!!!!!!!!!!!!!!!!!!!!!!! A. 2 The nature of the cipher block connection (CBC) working mode 12!!!!!!!!!!!!!!!!!!!!!!!! A. 3. The nature of the password response (CFB) working mode 13!!!!!!!!!!!!!!!!!!!!!!!!!!!!A. 4 The nature of the output response (OFB) working mode 14!!!!!!!!!!!!!!!!!!!!!!!!!A. 5 The nature of the counter (CTR) working mode 14!!!!!!!!!!!!!!!!!!!!!!!!!!! A. 6 The nature of the packet connection (BC) working mode 15!!!!!!!!!!!!!!!!!!!!!!!!!!!A. 7 Properties of output response with nonlinear function (OFBNLF) working mode 15!!!!!!!!!!!!!!! Appendix B (informative appendix) working mode example 17!!!!!!! !!!!!!!!!!!!!!!!!!! B. 1 Overview 17!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!B. 2ECB method 17!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! B. 3CBC Method 17!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! B. 4CFB Method 18!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! B. 5OFB Method 18!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! B. 6CTR method 18!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! Reference 20)

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前语Ⅲ!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!导言Ⅳ!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!１范围１!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!２规范性引证文件１!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!３术语和定义１!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!３．１术语１!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!３．２定义２!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!４缩略语和符号３!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!５电码本（ＥＣＢ）模式３!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!５．１变量定义３!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!５．２ＥＣＢ的加密方法描绘３!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!５．３ＥＣＢ的解密方法描绘４!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!６密码分组连接（ＣＢＣ）模式４!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!６．１变量定义４!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!６．２ＣＢＣ的加密方法描绘４!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!６．３ＣＢＣ的解密方法描绘４!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!７密码反应（ＣＦＢ）模式５!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!７．１参数定义５!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!７．２变量定义５!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!７．３ＣＦＢ的加密方法描绘５!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!７．４ＣＦＢ的解密方法描绘６!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!７．５建议６!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!８输出反应（ＯＦＢ）模式７!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!８．１参数定义７!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!８．２变量定义７!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!８．３ＯＦＢ的加密方法描绘７!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!８．４ＯＦＢ的解密方法描绘８!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!９计数器（ＣＴＲ）模式８!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!９．１变量定义８!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!９．２ＣＴＲ的加密方法描绘８!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!９．３ＣＴＲ的解密方法描绘９!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!１０分组连接（ＢＣ）模式９!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!１０．１变量定义９!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!１０．２ＢＣ的加密方法描绘９!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!１０．３ＢＣ的解密方法描绘１０!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!１１带非线性函数的输出反应（ＯＦＢＮＬＦ）模式１０!!!!!!!!!!!!!!!!!!!!!!１１．１变量定义１０!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!１１．２ＯＦＢＮＬＦ的加密方法描绘１０１１．３ＯＦＢＮＬＦ的解密方法描绘１１!!!!!!!!!!!!!!!!!!!!!!!!!!!!附录Ａ（规范性附录）工作模式的性质１２!!!!!!!!!!!!!!!!!!!!!!!!!Ａ．１电码本（ＥＣＢ）工作模式的性质１２!!!!!!!!!!!!!!!!!!!!!!!!!!Ａ．２密码分组连接（ＣＢＣ）工作模式的性质１２!!!!!!!!!!!!!!!!!!!!!!!Ａ．３密码反应（ＣＦＢ）工作模式的性质１３!!!!!!!!!!!!!!!!!!!!!!!!!Ａ．４输出反应（ＯＦＢ）工作模式的性质１４!!!!!!!!!!!!!!!!!!!!!!!!!Ａ．５计数器（ＣＴＲ）工作模式的性质１４!!!!!!!!!!!!!!!!!!!!!!!!!!Ａ．６分组连接（ＢＣ）工作模式的性质１５!!!!!!!!!!!!!!!!!!!!!!!!!!Ａ．７带非线性函数的输出反应（ＯＦＢＮＬＦ）工作模式的性质１５!!!!!!!!!!!!!!!!附录Ｂ（资料性附录）工作模式举例１７!!!!!!!!!!!!!!!!!!!!!!!!!!Ｂ．１概述１７!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!Ｂ．２ＥＣＢ方法１７!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!Ｂ．３ＣＢＣ方法１７!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!Ｂ．４ＣＦＢ方法１８!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!Ｂ．５ＯＦＢ方法１８!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!Ｂ．６ＣＴＲ方法１８!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!参考文献２０

(Preface III!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! Introduction IV!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!1 Scope 1!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!2 Normative Citation 1!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!3 Terms and Definitions 1!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!3.1 Terminology 1!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !3.2 Definition 2!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! 4 Abbreviations and symbols 3 !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! 5 Code Book (ECB) Mode 3!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!5.1 Variable Definition 3!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!5.2 Description of the encryption method of ECB 3!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!5.3 Decryption method description of ECB 4!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! 6 Cipher block connection (CBC) Mode 4!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! 6.1 Variable Definition 4!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!! 6.2 CBC encryption method description 4!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!! 6.3 CBC decryption method description 4!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!7 Password Response (CFB) Mode 5!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! 7.1 Parameter Definition ５!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! 7.2 Variable Definition 5!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!7.3 Description of the encryption method of CFB 5!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!7.4 Decryption method description of CFB 6!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!7.5 Recommendation 6!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! 8 Output Response (OFB) Mode 7!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!8.1 Parameter definition 7!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!8.2 Variable Definition 7!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! 8.3 Description of the encryption method of OFB 7!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! 8.4 Description of the decryption method of OFB 8!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!! 9 Counter (CTR) Mode 8!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!! 9.1 Variable Definition 8!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!9.2 CTR encryption method description 8!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! 9 .3 Decryption method description of CTR 9!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! 10 Packet Connection (BC) Mode 9!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!! 10.1 Variable Definition 9!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!! 10.2 BC encryption method description 9!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!10.3BC Decryption method description 10!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! 11 with non- Output Response of Linear Function (OFBNLF) Mode 10!!!!!!!!!!!!!!!!!!!!!! 11.1 Variable Definition 10!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!! 11.2 Description of encryption method of OFBNLF 1011.3 Description of decryption method of OFBNLF 11!!!!!!!!!!!! !!!!!!!!!!!!!!!! APPENDIX A (NORMAL APPENDIX) NATURE OF WORK MODE 12!!!!!!!!!!!!!!!!!!!!!!!! !!!A. 1 The nature of the working mode of the code book (ECB) 12!!!!!!!!!!!!!!!!!!!!!!!!!!! A. 2 The nature of the cipher block connection (CBC) working mode 12!!!!!!!!!!!!!!!!!!!!!!!! A. 3. The nature of the password response (CFB) working mode 13!!!!!!!!!!!!!!!!!!!!!!!!!!!!A. 4 The nature of the output response (OFB) working mode 14!!!!!!!!!!!!!!!!!!!!!!!!!A. 5 The nature of the counter (CTR) working mode 14!!!!!!!!!!!!!!!!!!!!!!!!!!! A. 6 The nature of the packet connection (BC) working mode 15!!!!!!!!!!!!!!!!!!!!!!!!!!!A. 7 Properties of output response with nonlinear function (OFBNLF) working mode 15!!!!!!!!!!!!!!! Appendix B (informative appendix) working mode example 17!!!!!!! !!!!!!!!!!!!!!!!!!! B. 1 Overview 17!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!B. 2ECB method 17!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! B. 3CBC Method 17!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! B. 4CFB Method 18!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! B. 5OFB Method 18!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! B. 6CTR method 18!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! Reference 20)

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