Targeted Password Guessing Using Neural Language Models

With the increasing prevalence of personal information breaches, targeted password guessing based on user-specific data has emerged as a serious security threat. Existing targeted password guessing attacks primarily rely on traditional statistical language models, which have limited capability in addressing the complexities of password structures and user behavior. Recent advancements in neural language models, particularly Transformer-based architectures, have achieved significant success in natural language processing tasks by capturing complex patterns and dependencies. However, their potential for improving targeted password guessing remains largely unexplored.To address this gap, we conduct a systematic evaluation of several widely used neural language models from NLP and assess their effectiveness in targeted password guessing. Experimental results on multiple real-world password datasets show that neural language models outperform existing approaches. Our proposed models achieve an improvement of 1.4%–4.6% compared to RFGuess-PII model, and 18%–40% compared to TarPCFG model. This work provides new insights into the potential of neural language models to enhance the effectiveness of targeted password guessing attacks.