The Secure Internet Live Conferencing (SILC) protocol was designed as a secure replacement for Internet Relay Chat (IRC) that provides live conferencing and instant messaging capabilities with strong security features. SILC uses encryption and authentication to securely transmit messages through a server network. It supports chat rooms, private messaging, and file transfers using SSH. The SILC protocol specifications have been submitted to the IETF and client and server software implementations are available and maturing.

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2.  Stands for Secure Internet Live Conferencing.
 Designed as a secure replacement for IRC (Internet
Relay Chat).
 Stable implementations for clients and server Also
has some features of instant messangers are
available.
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3.  Designed by Pekka Riikonen, started '96.
 Work stopped several times.
 1st public release in 2000.
 Silc-client 1.0 oct. 2003.
 Currently maturing of protocol.
 Protocol specs submitted to IETF, currently in a
draft phase (will become RFC soon).(Internet
eng.task force)
 Version 1 of silc, toolkit to follow soon. 3

4.  Protocol for authenticated and encrypted
 Live Conferencing
 Supports chat and instant messenger like systems.
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5.  Instant Messaging [IM]
 Internet Relay Chat [IRC]
 Extensible Messaging And Presence Protocol
[EMPP]
 Secure Internet Live Conferencing [SILC]
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6.  Instant messaging (IM) is a collection of technologies
used for real-time text-based communication between
two or more participants over the Internet, or other
types of networks
 Weakness :-
 Security risks
 Compliance risks
 Inappropriate use
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7.  Internet Relay Chat (IRC) is a form of real-time
Internet text messaging (chat) or synchronous
conferencing.
 It is mainly designed for group communication.
 Weakness :-
IRC connections are usually unencrypted and
typically span long time periods, they are an
attractive target for hackers. 7

8.  EMPP is an open-standard communications protocol for
message-oriented middleware based on
XML.(extensible markup language).
 Systems approach of development and application.
 Google Wave's federation protocol is an extension to the
EMPP protocol.
 Weaknesses:-
 Presence data overhead
 In-band binary data transfer is inefficient
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9. Key-Features:
 All messages are encrypted and authenticated.
 Keys managed by server or user.
 Messages are sent through server-net.
 File transfer via SFTP.
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10.  SERVERS
 ROUTERS
 CLIENT
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12.  SILC PACKET PROTOCOL
 SILC KEY EXCHANGE [SKE] PROTOCOL
 SILC CONNECTION AUTHENTICATION
PROTOCOL
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14.  The file transfer support in chat protocols are a absolute
requirement nowadays, and chat protocol without one is no chat
protocol at all.
 The support for file transfer in SILC has been designed so that
using practically any file transfer protocol is possible.
 The file transfer protocol used in SILC protocol is the
SSH File Transfer protocol (SFTP).
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15.  The Secure Internet Live Conferencing (SILC)
protocol is a new generation chat protocol that
provides all the common conferencing services with
strong support for security. It has wide range of
security properties that should meet the highest
levels of security requirements, while not forgetting
easy of use. The network topology offers new
architectural solution with better scalability over
traditional chat protocols.
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