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Network Security
Gene Itkis

Internet Engineering Task Force (IETF)
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
ANSI
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
X9.42
ITU
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
www.ietf.org
Documents: RFC 2246
X.509
Netscape
5/25/2017
Gene Itkis: CS558 Network Security
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

1993 – Mosaic (“browser #1”)
1994 – Netscape Browser released
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
SSL v1 design complete – never released
SSL v2 released in Navigator 1.1
 Badly broken (bad seeds for PRNG)

1995 – Explorer released
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PCT (MS), SSL v3 (Netscape)
1996-1999 – TLS 1.0
1999 – WTLS
Gene Itkis: CS558 Network Security
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Application (HTTP)
SSL
TCP
IP
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Gene Itkis: CS558 Network Security
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
Separate Layer
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
Application-Specific
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
Over TCP: SSL
Over IP: IPSec
SHTTP
Parallel
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Kerberos; Kerberos with TLS?
Gene Itkis: CS558 Network Security
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
Connection-oriented
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
No non-repudiation
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
SSL, TLS do not support UDP
But WTLS does
But signatures are used for AKE
“Only protects the pipe”
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Attacks are mounted on data before and after “the
pipe”
Gene Itkis: CS558 Network Security
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
Server authentication
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

Client authentication is optional
Encryption
Message integrity
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
Handshake
 Set protocol details
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

Authenticate server
Establish keys
Data transfer
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
ClientHello
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ServerHello



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
Supported options
Options to be used
ServerCertificate (ServerKeyExchange)
ServerHelloDone
ClientKeyExchange
Finished (sent by client)
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