苹果推出传感器级签名图像方案，挑战 C2PA 信任模型
原标题：Apple Reference Image Signs Photos at the Sensor, Moving Provenance Trust Away from C2PA
AI 摘要
苹果公布了 Apple Reference Image 的设计，这是一种在 iPhone 18 Pro 系列主传感器上可选启用的拍摄模式，能在传感器层面即时签名像素数据，并借助 Private Cloud Compute 完成验证与处理，最终生成带复合签名的 DNG 安全数字底片。该方案将图像来源信任从 C2PA 的后期编辑链转移到传感器、苹果云基础设施和自有签名服务上，并声称是唯一量子安全的图像来源方案。社区反应分歧明显，质疑集中在翻拍屏幕可伪造、匿名性依赖对苹果云的信任，以及实际使用场景是否成立。
正文节选
Apple has published the design of Apple Reference Image, an opt-in camera mode on the main sensor of the iPhone 18 Pro and iPhone 18 Pro Max that produces a timestamped photograph verifiable as a real sensor capture. The design moves trust in image provenance away from the editing chain certified by the C2PA standard and toward the sensor, Apple's Private Cloud Compute infrastructure, and Apple's own signing service. Apple's argument is that C2PA attaches provenance after capture, leaving the ch