|Subject||Computer and Network Security|
|NU Year||Set: 3.(b) Marks: 1+4 Year: 2015|
MIME (Multi-Purpose Internet Mail Extensions) is an extension of the original Internet e-mail protocol that lets people use the protocol to exchange different kinds of data files on the Internet: audio, video, images, application programs, and other kinds, as well as the ASCII text, handled in the original protocol, the Simple Mail Transport Protocol (SMTP).
Limitations of SMTP/REC 822:
- Body must be encoded in 7 bit ASCII: no binaries
7 bit= 128 possible characters
Images, video, etc are inherently "8 bit"
- No National Language characters (8 bit)
- SMTP servers may have arbitary size limit.
- SMTP gateways have inconsistent ASCII to EBCDIC Mapping