Internet services

The Internet can be used in in different ways: for distributing and retrieving information, for one-to-one, one-to-many and many-to-many communication, and for the access services. Accordingly, there are different services on offer. The most important of these are listed below.

Telnet

FTP (File Transfer Protocol)

Electronic Messaging (E-Mail)

World Wide Web (WWW)

Bulletin Board Systems (BBS)

Electronic Data Interchange (EDI)

Internet Relay Chat (IRC)

Multiple User Dimensions (MUDs)

Gopher

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Polybius Checkerboard


 

 1

 2

 3

 4

 5
1

 A

 B

 C

 D

 E
2

 F

 G

 H

 I

 K
3

 L

 M

 N

 O

 P
4

 Q

 R

 S

 T

 U
5

 V

 W

 X

 Y

 Z


It is a system, where letters get converted into numeric characters.
The numbers were not written down and sent but signaled with torches.

for example:
A=1-1
B=1-2
C=1-3
W=5-2

for more information see:
http://www.ftech.net/~monark/crypto/crypt/polybius.htm

http://www.ftech.net/~monark/crypto/crypt/pol...
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