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  1. Hello, All over the marketing and the forums, it is stated that Bittorrent Sync uses 256-bit AES encryption, and also nowhere is the cipher mode actually stated. I have information that shows me that Bittorrent Sync is instead, actually (potentially) using 128-bit AES encryption. Whilst this may not be insecure, it shows (provided there isn't something beyond the story) that the Sync team is either not being truthful about the security, or there is a disconnect. The other problem (again, provided there isn't something else beyond the story) is that the cipher mode is ECB, or Electronic Code Book. It means there is no mode at all, which is definitively the least secure method of using AES. Is ECB what is used over the wire, or is a cipher mode implemented over this ECB? I have attached a screenshot (also available at https://i.minus.com/i4FurGjh8WjUW.png ) that shows why I believe this is the case. Notice the lines "pbData.aiKeyAlg = CALG_AES_128" near the middle, and "v13 = CRYPT_MODE_ECB" about 1/5 of the way from the bottom. Also while I'm here, can a developer explain how read-only keys work, and how 1) malicious nodes are prevented from syncing in new or modified files, as well as 2) how a read-only node knows the difference between another read-only node and a regular node? Please give the low-level gritty explanation, as I would prefer that over a higher-level one. Thanks