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Re:More Than One Third of Tutanota Emails Are End-To-End Enc... by tedunangst on Sunday September 13, 2015 @10:40AM (#10211540)
Pretty sure you can do bit flipping without access to the plaintext...
Re:More Than One Third of Tutanota Emails Are End-To-End Enc... by sarciszewski on Sunday September 13, 2015 @02:17PM (#10212243)
Yeah. In addition to the Crypto Pals challenges, I actually used this to prove a point (with contrived example):

https://paragonie.com/blog/2015/05/using-encryption-and-auth...