Nothing. The FAT file system simply does not support the features needed for file/folder encryption. You'll have to convert the volume to NTFS.
Convert the volume to NTFS
Convert a FAT volume to NTFS so that you can use encryption.
using a professional folder lock software, such as Kakasoft Advanced Folder Encryption.
if you want to password protect folders on your computer you can use a password protection software, saying Kakasoft Advanced Folder Encryption(http://www.kakasoft.com/folder-encryption),open it and set password to protect you data easily.
no because the program uses a key which is then stoed some where in the system so you cant!! SORRY
Encryption can be done on documents and files. There are also major software that support folder encryption. Try using the ones that have tried and tested like Axcrypt and Data Protecto.
A folder must be on NTFS to be encrypted using EFS.
No. Most filesystems on Linux do not have encryption builtin, though you can have an ecryptfs-formatted partition on certain distributions that offer to encrypt your home folder. Most other filesystems while unencrypted, can rely on using LUKS as an encryption layer.
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how to convert encryption to decryption using VB
You don't really need to "secure" a folder to send it over the network as the wireless encryption takes care of it for you. You can use a third party folder encryption app or compress the folder and give it a password if you really want to have overkill. If you're just on a Home network, as in using it in your home, then all you need to do is set the wireless encryption to WPA-2 (it's the highest non commercial encryption) and everything you send to the other computers is encrypted. Depending on the uniqueness of the password, (length of password, how many numbers, random letters, uppercase letters, etc.) it could take years to decrypt even with a high end "cracker".
It is a measurement of volume using units from the metric system.