The file encryption function, which is also the dominant one, is quite straightforward and can be carried out using either the Blowfish algorithm (for faster encryption), or the triple DES one (for stronger encryption), as it can be seen from this screenshot . It would be better though if the program offered more options, such as the AES-256 algorithm, which is a very popular option in other software. MEO asks for a password for the encryption, which has to be entered twice for verification. However, it doesn’t provide any evaluation of the password’s strength, like other programs. The encryption process creates a file with the extension .meo or .exe (if the self-decryption option is chosen). The option for the encrypted file to be in a compressed format can be handy if you want to save some space. When decrypting a file, a progress bar appears to provide an insight on how long the whole process will take (see screenshot ).
The email encryption function is quite similar. It is necessary to set up the email configuration first (see image for details). Although the program does not encrypt the subject of the email, it encrypts everything else, including the attachment(s) (see screenshot ). In addition, a copy of the encrypted email can be saved for future reference. This function works decently, even though it is not clear what kind of encryption algorithm it uses (there is no relevant option in the email dialog box). Moreover, the email has to have an attachment in order to be encrypted, something which is a bit strange as a prerequisite.
The hash function is also straight-forward. It has the option of three popular hashing algorithms, MD5, SHA-1 and Tiger Tree. Both the hash creation and validation are quite fast and very simple to perform. This function is probably the highlight of this software.