A Survey on Deep Learning-Based Encrypted Malicious Traffic Detection Methods

doi:10.3969/j.issn.1671-1122.2025.08.009

Abstract

Abstract:

With the continuous improvement of network security awareness and the widespread application of encryption technology, encrypted traffic in the network is growing exponentially. Although encryption technology plays an important role in protecting user privacy and data security, it also provides a means for malicious actors to hide their attack behaviors, bringing great challenges to network security supervision and protection. With the increasing amount of encrypted traffic, traditional malicious traffic detection methods are no longer applicable. Deep learning, with its advantages in automatic feature extraction and complex data processing, has become a key technology to improve detection performance. Therefore, this paper systematically reviewed the latest achievements of deep learning in encrypted malicious traffic detection. Firstly, a general encrypted traffic detection framework was proposed according to the general steps of encrypted traffic detection. Secondly, it introduced aspects such as data collection and processing, feature extraction and selection, model methods, and evaluation metrics applied to encrypted malicious traffic detection. It also organized and analyzed existing public datasets and discusses solutions to the problem of data imbalance. Then, from the three perspectives of supervised learning, unsupervised learning, and semi-supervised learning, it compared and analyzed the advantages, disadvantages, and classification performance of different detection methods, and summarized the strengths and weaknesses of different learning methods. Finally, it discussed the open problems in the field of encrypted malicious traffic detection and looked forward to future research directions.

Key words: encrypted malicious traffic detection, deep learning, encrypted traffic, data imbalance

CLC Number:

TP309

WANG Gang, GAO Yunpeng, YANG Songru, SUN Litao, LIU Naiwei. A Survey on Deep Learning-Based Encrypted Malicious Traffic Detection Methods[J]. Netinfo Security, 2025, 25(8): 1276-1301.

Figures/Tables 14

数据集	年份	描述	加密	平衡	优缺点
SDN-SlowRate-DDoS^[30]	2023	使用SN4I的物理设备部署了基于SDN的数据中心拓扑，其中包含两个主干交换机和4个枝叶交换机	是	是	优点：针对IoT设备和5G等下一代网络的新威胁缺点：攻击行为单一
CIC-MalMem-2022^[31]	2022	该数据集由50%的恶意软件和50%的良性软件组成，总共包含58596条记录	是	是	优点：正常流量与恶意流量平衡缺点：不完全加密流量
CIRA-CIC-DoHBrw-2020^[32]	2020	使用5个不同的浏览器/工具和4台服务器在应用程序中实现DoH协议，以捕获Benign-DoH、Malicious-DoH和non-DoH流量	是	否	优点：加密流量缺点：仅针对DNS协议
CIC-MalDroid-2020^[33]	2020	从多个来源收集超过17341个Android样本，包括VirusTotal服务、Contagio、AMD、MalDozer和最近研究中使用的其他数据集	是	是	优点：包括完整捕获的静态和动态特征缺点：采集范围受限
IoT-23^[34]	2020	IoT-23是来自IoT设备网络流量的新数据集，在IoT设备中执行了20个恶意软件捕获，以及3个针对良性IoT设备流量的捕获	部分	是	优点：采集真实IoT设备流量缺点：大部分流量未加密
BoT-IoT^[35]	2019	BoT-IoT是通过在新南威尔士大学堪培拉网络中心的网络靶场实验室设计一个真实的网络环境而创建的	是	否	优点：数据量大缺点：数据不平衡
CIC-IDS-2017^[36]	2017	该数据集基于HTTP、HTTPS、FTP、SSH和电子邮件协议的25个用户的抽象行为，通过B-Profile系统产生自然背景良性流量	是	否	优点：数据集符合10项标准缺点：正常用户行为由脚本产生
CIC-AndMal2017^[37]	2017	采集自真实的智能手机上运行的恶意软件和良性应用程序，共计4354个恶意软件和6500个良性样本	是	是	优点：包含隐蔽性攻击缺点：数据量较小
NDSec-1^[38]	2016	数据集包括有效载荷在内的原始网络跟踪以及系统日志和窗口事件日志，并使用YAF捕获的双向流	是	是	优点：包含多类型攻击数据缺点：没有正常流量
ISCX VPN-nonVPN^[39]	2016	数据集捕获了一个常规会话和一个通过VPN的会话，共有14个流量类别	部分	否	优点：良性流量具有多样性缺点：缺乏攻击流量
UNSW-NB15^[40]	2015	数据集由澳大利亚网络安全中心的网络靶场实验室创建，包含82332条记录的训练集，175341条记录的测试集	是	否	优点：数据规模大缺点：不是真实流量
CTU-13^[41]	2013	该数据集的目标是大量捕获真实僵尸网络流量，包含不同僵尸网络样本的13个捕获场景	部分	否	优点：包含13种僵尸网络场景缺点：数据不平衡
NSL-KDD^[42]	2009	NSL-KDD数据集是KDD99数据集的修订版本，数据集的每条记录包含43个特征，其中，41个特征指的是流量输入本身，最后两个特征是标签（正常或攻击）和分数	否	否	优点：数据集相对平衡缺点：不针对加密流量

学习范式	文献	分类模型	数据集	优点	缺点
监督学习	文献[82]	1D-CNN	ISCX VPN-nonVPN	能够高效处理序列数据	长序列建模能力有限
	文献[83]	NIN	ISCX VPN-nonVPN	提高了计算效率	增加了额外的通信开销
	文献[84]	SAM	WIDE、 UNIBS、 ISCX VPN-nonVPN	实时性强，支持在线流量分类	无法应对数据不平衡问题
	文献[67]	2D-CNN	USTC-TFC2016	泛化能力强	易受对抗攻击影响
	文献[89]	CNN-GRU-FF	UNSW-NB15、 NSL-KDD	能够有效处理类别不平衡问题	计算资源需求高
	文献[90]	IDS-INT	UNSW-NB15、 CIC-IDS2017、 NSL-KDD	对模型的决策过程进行了解释	不能满足高吞吐场景
	文献[70]	GTID	ISCX2012、 IDS2017	具有良好的鲁棒性	未考虑未知攻击检测
	文献[10]	MTCD	TCD-2022	具有较强的空间层级信息建模能力	训练不稳定，易受超参数影响
	文献[11]	CapsNet	CSE-CIC-IDS2018	引入少量样本学习，不依赖标签数据	适用场景有限，在复杂流量数据上的应用还不成熟
无监督学习	文献[93]	KG-DBN	NSL-KDD、 UNSW-NB15	能够处理处理大规模数据	参数选择的不确定性会影响检测准确率
	文献[94]	CL-ETC	USTC-TFC2016、自建数据集	鲁棒性强	模型训练时间长
	文献[97]	DAE	CICIDS2017、 NSL-KDD	具有较强的适应能力	依赖数据增强
	文献[54]	CGAN	ISCX2012、 USTC-TFC2016	解决了类别不平衡问题	生成时易陷入局部最优
半监督学习	文献[12]	ET-BERT	ISCX VPN-nonVPN、 CSTNET-TLS 1.3	泛化能力强且能够在少量标注数据上快速适应具体任务	模型解释性不足
	文献[14]	SecurityBERT	Edge-IIoT	高效性，适合在资源受限的IoT设备上部署	对特定数据分布的适应性有限
	文献[15]	MTC-MAE	USTC-TFC2016、 CIC-AndMal2017、 ISCX VPN-NonVPN	支持多种分类场景	依赖预训练数据的质量
	文献[16]	NetMamba	USTC-TFC2016、 ISCXVPN2016、 CICIoT2022	推理速度快、占用内存小	模型解释性不足
	文献[8]	MalDiscovery	CTU-13	多视图特征融合高表征能力	计算资源需求高
	文献[9]	N-STGAT	NF-BoT-IoT-v2	处理效率高	应用场景局限性

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文献	年份	描述
文献[17]	2020	采用“六步法”的一般检测框架模型对检测过程进行详细论述，并整理了主流公开数据集
文献[18]	2021	对网络流量的侧信道攻击原理进行总结归纳，并从攻、防两个角度对网络流量的侧信道攻击的研究进展进行详细阐述
文献[19]	2022	对TLS协议恶意加密流量识别工作进行综述，包括基于机器学习和基于深度学习的研究成果，以及现有工作的不足，并对未来工作和发展趋势进行展望
文献[20]	2021	通过系统性框架和实验分析，为加密恶意流量检测提供了方法论与数据基础
文献[21]	2023	对现有检测、分类和识别方法，从多个粒度和角度进行划分，系统性地归纳与比较现有研究的优缺点
文献[22]	2022	按分析目标而非技术类型组织文献，提出了一个通用的工作流程框架，并详细讨论了不同分析目标下的研究
文献[23]	2024	系统综述探讨了深度学习在加密数据上进行隐私保护入侵检测的进展

协议	加密层	优势	局限性
HTTPS	应用层	生态成熟、兼容性好	依赖证书管理
SSH	应用层	轻量高效、支持隧道和端口转发	仅限特定服务
IPsec	网络层	全流量加密、兼容多协议	配置复杂
QUIC	传输层	握手延迟低、抗丢包能力强	兼容性差
SSL/TLS	传输层	标准化高、支持多种应用协议	计算资源消耗较大

解决层面	文献	策略	优点	缺点
数据层面	文献[50]	Cluster-SMOTE	容易实现，效率较高	存在边界模糊风险和信息丢失风险，生成质量不如GAN等生成模型
	文献[53]	MSH-GAN	能够挖掘流量的深层次特征，生成数据具有真实性	易陷入局部最优
	文献[55]	VAE	能够准确地重建数据并更好地保留原始分布	存在模式崩溃问题
	文献[57]	扩散模型	减轻模式崩溃问题，训练过程更稳定	计算成本高，训练和推理速度慢
算法层面	文献[58]	CAB	自适应调整类别权重，不需要引入额外的数据	可能影响多数类的性能
	文献[59]	可变最小置信度阈值	相较于CAB，可变最小置信度阈值可以兼顾准确率和召回率，减少错误分类	阈值优化会受数据质量影响
	文献[60]	自适应平衡训练方法	可以根据数据的实际分布自动调整策略，而不是依赖于人为设定的类别比例或权重	在极端不平衡的情况下，效果比较差
	文献[61]	引力计算	能以数据增强方法相结合，共同优化数据不平衡问题	引力计算会受到维度灾难影响，导致计算效率下降

特征类型	核心优势	技术局限	适用场景
统计特征	单流处理延迟低；专家规则可解释性强；特征维度低	信息损失大；新型APT攻击漏报率高	资源受限的边缘设备实时检测；工业控制网络异常告警；运营商级DDoS快速筛查
时序特征	行为建模强；支持跨协议行为分析；可检测低频隐蔽信道	存在时序失真；内存消耗大	APT攻击中的低频隐蔽通信检测；暗网流量行为分析；物联网设备周期性通信监测
原始流特征	支持恶意软件家族细粒度分类；深度特征挖掘；端到端学习避免人工特征偏差	计算成本高；隐私合规风险	协议指纹精细识别；恶意载荷深度取证分析
频域特征	抗时序噪声干扰；特征维度低	难以还原完整时序行为；需要人工干预	工业时序攻击（如PLC脉冲注入）；频分复用隐蔽信道检测

类别	适用场景	文献	方法	优点	缺点
过滤法	高维数据预处理	文献[74]	最大信息系数、皮尔逊系数	灵活性强、计算效率高	对异常值敏感、较难解释
		文献[75]	卡方检验、熵阈值	适合离散数据、高效	对频数要求较高、阈值设定难
		文献[76]	信息论、图模型	有较强理论基础、能够捕捉到线性和非线性关系	计算复杂度高、对噪声敏感
包装法	小规模数据，需高精度	文献[77]	递归特征消除	适应性强、具有一定可解释性	对模型的依赖性强（该文依赖信息增益的计算）
包装法	小规模数据，需高精度	文献[78]	遗传算法	进行了可解释性分析	收敛速度慢
嵌入法	大规模数据，端到端训练	文献[79]	L1正则化	自动特征选择、效率得到了提升	正则化系数过高，容易导致过拟合
		文献[80]	SHAP	能够为每个特征提供一个直观的贡献值，并且可以提供可解释性	在特征数较多时，会导致计算复杂度较高
		文献[81]	XGBoost	高效处理高维数据，支持并行计算，适合类别不平衡问题	需要进行数据预处理，对异常值较敏感