buuctf zip pseudo encryption

Usually pseudo encryption is always dependent on osx, this question can not be directly extracted, so look at the pseudo encryption
to put two pictures (Fig is a steal)


generally mark globally bit data area source file compression, encryption really is 0900, pseudo encryption for 0000, and later compressed bit mark globally source file directory area from 0000 changed to 0900 to complete the pseudo encryption, and then look at this question

directly bullish really like encryption, but in fact the two full mark changed to 0900, change it back

after saving unpack, get flag