-What makes this program:  
allows you to transmit files securely, those who intercepts it can not be traced back to the plain text data  
 
-How he does it:  
through communication between two computers, both must have securefiletransfer (freeware, open source under New BSD license) one of which generates a key pair for asymmetric encryption, sends the public key to another computer that produces a symmetric key and sends the first computer after it is encrypted with the public key, the computer that receives possesses the private key to decrypt the symmetric key asymmetric and at this point the two computers are aware of a symmetric key through Rijndael (AES "implementation") is able to produce a level of encryption security that a brute force attack currently require time processing machine virtually impossible, the public key is exchanged in clear in 1024 is not feasible, then bit back to the private key.  
 
-other features:  
Server mode allows the program to create an unlimited number of users each of which is defined a username and password for each user is defined as a directory to read exactly what the user can access a directory read and write where the user has write access, for example the user with username "test" and password "mypassword" will have access to read the entire C: drive and write to c: \ Users \ test \ documents, to request or send the file should of course add to the server and send your username and password that will go on the Internet encrypted, as all data exchanged with Rijndael. SecureFileTransfer software encrypts all data stored locally that