标题： 耳语代理：一种面向代理的互联网事件驱动隐蔽通信协议 显示英文标题

标题： Whispering Agents: An event-driven covert communication protocol for the Internet of Agents

摘要： 互联网代理（IoA）的出现给敏感、高风险领域中的通信隐私带来了关键挑战。 虽然标准的代理到代理（A2A）协议保护了消息内容，但它们并未设计用于保护通信行为本身，使代理容易受到监视和流量分析。 我们发现，代理对话丰富的事件驱动特性提供了一个强大 yet 未被开发的隐蔽通信媒介。 为了利用这一潜力，我们引入并形式化了隐蔽事件通道，这是第一个由三个相互关联的维度驱动的代理隐蔽通信统一模型，这三个维度包括存储、定时和行为通道。 基于该模型，我们设计并工程化了{\Pi }CCAP，一种操作此事件驱动范式的新型协议。 我们的全面评估表明，{\Pi }CCAP在保持对基于大型语言模型的看守者不可察觉的同时，实现了高容量和鲁棒性，确立了其实际可行性。 通过系统地工程化该通道，我们的工作提供了开发下一代监控系统和防御协议的基础理解，以实现安全可信的IoA。 显示英文摘要

摘要： The emergence of the Internet of Agents (IoA) introduces critical challenges for communication privacy in sensitive, high-stakes domains. While standard Agent-to-Agent (A2A) protocols secure message content, they are not designed to protect the act of communication itself, leaving agents vulnerable to surveillance and traffic analysis. We find that the rich, event-driven nature of agent dialogues provides a powerful, yet untapped, medium for covert communication. To harness this potential, we introduce and formalize the Covert Event Channel, the first unified model for agent covert communication driven by three interconnected dimensions, which consist of the Storage, Timing,and Behavioral channels. Based on this model, we design and engineer {\Pi}CCAP, a novel protocol that operationalizes this event-driven paradigm. Our comprehensive evaluation demonstrates that {\Pi}CCAP achieves high capacity and robustness while remaining imperceptible to powerful LLM-based wardens, establishing its practical viability. By systematically engineering this channel, our work provides the foundational understanding essential for developing the next generation of monitoring systems and defensive protocols for a secure and trustworthy IoA.