https://ourcodeworld.com/articles/read/471/how-to-encrypt-and-decrypt-files-using-the-aes-encryption-algorithm-in-c-sharp https://codereview.stackexchange.com/questions/194902/file-encryption-with-password https://stackoverflow.com/questions/740837/how-to-create-a-password-protected-file-in-c-sharp 검색: https://www.google.com/search?newwindow=1&biw=1920&bih=898&ei=5aXgXtjtLNaDoASv447oDQ&q=c%23+file+encryption+with+password&oq=C%23+File+Enc&gs_lcp=CgZwc3ktYWIQAxgFMgIIADICCAAyAggAMgIIADICCAAyAggAMgIIADICCAAyAggAMgQIABAeOgUIABCxAzoECAAQQ1CXM1ieQmCOaWgAcAB4AIABeYgB3wiSAQM1LjaYAQCgAQGqAQdnd3Mtd2l6&sclient=psy-ab