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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