Type74 ED before 4.0 misuses 128-bit ECB encryption for small files, which makes it easier for attackers to obtain plaintext data via differential cryptanalysis of a file with an original length smaller than 128 bits.
https://euvd.enisa.europa.eu/vulnerability/EUVD-2015-3070
http://type74org.blog14.fc2.com/blog-entry-1384.html
http://type74.org/edman5-1.php