Chapter 36 File Transfer Concepts

Presentation on theme: "Chapter 36 File Transfer Concepts"— Presentation transcript:

1 Chapter 36 File Transfer Concepts

2 Contents Using File Transfer Protocol(FTP)
Transferring Files by Downloading Files from the Web Quality, Security, and Ownership Issues Spyware

3 Using File Transfer Protocol(FTP) 1
Client:Client 가 아닌 Server:Client FTP Client-server system 사용 FTP server / FTP client HTTP Web server(Web sites) / Web clients(browsers) Difference FTP service 는 양방향이다

4 Using File Transfer Protocol(FTP) 2
Ftp Clients WS_FTP for Windows computers, Dartmouth College’s shareware program, Fetch for the Macintosh FTP Servers Public(“Anonymous”) and Private FTP Service Transferring Files of Different Types Binary and text mode Finding Files on FTP Servers Archie : 일종의 Search engine Running Your Own FTP Servers

5 Transferring Files by E-Mail
Multimedia Internet Mail Extensions(MIME) : Internet standard Uuencoding(UNIX) BinHex(Mac)

6 Downloading Files from the Web
Redirect Browsers가 FTP server로 link Browsers의 Internal FTP client software 가 작업 Browses는 다른 작업이 가능(주로 file download) Redirect 불가 Browsers가 계속 작업 Save하지 않고 display하는 것에 초점 Gif, MIME type의 file(Web page의 text)

7 Quality, Security, and Ownership Issues
Ensuring File Quality and Integrity Ensuring Security Avoid downloading programs from anyone but reliable sources Check the file’s exact length in bytes against published file length Scan the file for known viruses Observing Property Rights

8 Spyware 개인정보유출 프로그램 GetRight, Go!Zilla, CuteFTP 3.0 등에 개인정보유출 프로그램이 포함, 사용자의 시스템 정보 및 인터넷 사용 상황을 미국 오리에이트(Aureate, 현재는 Radiate)사로 보고하고 있다는 주장이 제기 Spyware가 포함되어 있는 소프트웨어는 거의 300 여종

9 OptOut Steve Gibson