multipart/encrypted
aes128gcm
AEAD_AES_128_GCM
[1] Crypto Law Survey ( (2/25/2013, 9:41:34 AM 版)) http://www.cryptolaw.org/
[2] IAB Statement on Internet Confidentiality | Internet Architecture Board (5/3/2015, 6:25:32 AM 版) https://www.iab.org/2014/11/14/iab-statement-on-internet-confidentiality/
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