7zip ... not so good under the covers?

[Jim Cheetham]

https://threadreaderapp.com/thread/1087848040583626753.html

"So I wanted to encrypt some files. Thought about using 7z+password.
Stackexchange folks said "Didn't review it but it should be fine. You can
browse the code yourself". So I did. After a few mins I noticed they use
8byte "random" IV. Yes, half of IV is zeroes. But it gets worse."
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