请问HN：messenger.com备份的端到端加密消息的威胁模型
messenger.com 正在推出对端到端加密（E2EE）消息的备份功能。用户需要设置一个6位数字的PIN码，以便在全新的浏览器或设备上恢复备份的消息。
这个熵值感觉太低了，我想了解它是如何设计的，以确保Meta无法通过暴力破解的方式在他们的端读取备份的消息。
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messenger.com is rolling out backup for e2ee messages. They require the user to set a 6-digit PIN to recover backed up messages on a brand new browser/device.<p>This amount of entropy feels way too low, and I would like to understand how it is designed so that Meta can't brute force the 6 digit PIN on their end to read the backed up messages.