"Let's Encrypt" is an uniquely encryption software. It can encrypt your Email words and files, or shred files to prevent any anti-deletion tool or harddisk data recovery software from restoring deleted files. You can use more than 20 encryption factors, 6 encryption algorithms and 4 encryption modes to combine thousands and thousands of encryption methods. You can also easily decrypt the encrypted Email words you received, of course, you must get the encryption method(a description code consisting of several characters) from the sender.