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Lernmaterialien für Media Security an der Hochschule der Medien Stuttgart

Greife auf kostenlose Karteikarten, Zusammenfassungen, Übungsaufgaben und Altklausuren für deinen Media Security Kurs an der Hochschule der Medien Stuttgart zu.

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• RTP Control Protocol (RTCP)

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– Adaption to variable quality of service and bandwiths. Feedback comes via RTCP
– Support Multicast-Sessions

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Security Protocols for SIP

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• SIP Digest:
Authentication analogous to HTTP Digest Authentication Method

• SIPS (SIP over TLS): can be deployed if TCP is transport protocol for SIP

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Goals of SRTP – Secure RTP


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– Confidentiality
– Integrity Protection
– Replay Protection
– High Throughput, Low Packet Expansion
– High tolerance against packet loss / packet reorder

Lösung ausblenden
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Key Management in SRTP

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TESTE DEIN WISSEN

• Master Keys are agreed upon independently

• A Master Key Index in the packets points to the Master Key currently in use

• After r packets, new session keys for authentication, and encryption are derived from MK

• The same Master Key is used for max. 248 RTP-packets per session

• Different Streams (Audio/Video) of one session may use the same Master Key

• Different Sessions must use different Master Keys

Lösung ausblenden
TESTE DEIN WISSEN

MIKEY Variants

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• MIKEY_PS
– Password based
– Password has to be securely exchanged in beforehand
• MIKEY_PK
– Based on RSA-Public Keys and certificates
• MIKEY_DHSIGN
– signed Diffie-Hellmann-Key Exchange
• MIKEY_DHHMAC
– DH-key exchange authenticated with HMAC

Lösung ausblenden
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MIKEY_PS Advantages/Disadvantages

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• Advantages
– fast
– computationally lightweight
– short messages
=>Suitable for wireless scenarios and thin devices
• Disadvantages
– Need to exchange secret K in beforehand
– Bob must use Alice‘s choice of TGK

Lösung ausblenden
TESTE DEIN WISSEN

MIKEY_PK Advantages/Disadvantages

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• Advantages
– No secret exchange in beforehand needed
– Envelope key may be used for further key updates
• Disadvantages
– PKI necessary
– verification of certificates may make further messages necessary
– Expensive Message Generation for Initiator
– Bob must use Alice‘s choice of TGK

Lösung ausblenden
TESTE DEIN WISSEN

MIKEY_DHSIGN Advantages/Disadvantages

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TESTE DEIN WISSEN

• Advantages
– No secret exchange in beforehand needed
– Both parties take part in generating TGK
• Disadvantages
– PKI needed
– verification of certificates may make further messages necessary
– Expensive Message Generation for both
– pure P2P protocol, no way to generate a group key

Lösung ausblenden
TESTE DEIN WISSEN

MIKEY_DHHMAC Advantages/Disadvantages

Lösung anzeigen
TESTE DEIN WISSEN

• Advantages
– Both parties take part in generating TGK
– No signatures needed
– No PKI needed
• Disadvantages
– Need to exchange secret K in beforehand
– pure P2P protocol, no way to generate a group key

Lösung ausblenden
TESTE DEIN WISSEN

Multicast Security Issues

Lösung anzeigen
TESTE DEIN WISSEN

Data Confidentiality

Group Key Management

Data Source Authentication

Security Policies

– Policies concerning group membership
– Policies concerning security enforcement

Lösung ausblenden
TESTE DEIN WISSEN

Requirements for Group Key Management

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TESTE DEIN WISSEN

• Requirements
– Security
– Efficiency
– Scalability
– Support removing/adding members
• Forward Secrecy
• Backward Secrecy

Lösung ausblenden
TESTE DEIN WISSEN

• Real Time Transport Protocol (RTP)

Lösung anzeigen
TESTE DEIN WISSEN

– delivering media content after session has been negotiated by SIP

– Marking and Synchronising of sent and received
packets by timestamping

– Unique Sequence Numbers in RTP to ensure correct
packet order

– Identification of packet initiator

Lösung ausblenden
  • 35781 Karteikarten
  • 984 Studierende
  • 26 Lernmaterialien

Beispielhafte Karteikarten für deinen Media Security Kurs an der Hochschule der Medien Stuttgart - von Kommilitonen auf StudySmarter erstellt!

Q:

• RTP Control Protocol (RTCP)

A:

– Adaption to variable quality of service and bandwiths. Feedback comes via RTCP
– Support Multicast-Sessions

Q:

Security Protocols for SIP

A:

• SIP Digest:
Authentication analogous to HTTP Digest Authentication Method

• SIPS (SIP over TLS): can be deployed if TCP is transport protocol for SIP

Q:

Goals of SRTP – Secure RTP


A:

– Confidentiality
– Integrity Protection
– Replay Protection
– High Throughput, Low Packet Expansion
– High tolerance against packet loss / packet reorder

Q:

Key Management in SRTP

A:

• Master Keys are agreed upon independently

• A Master Key Index in the packets points to the Master Key currently in use

• After r packets, new session keys for authentication, and encryption are derived from MK

• The same Master Key is used for max. 248 RTP-packets per session

• Different Streams (Audio/Video) of one session may use the same Master Key

• Different Sessions must use different Master Keys

Q:

MIKEY Variants

A:

• MIKEY_PS
– Password based
– Password has to be securely exchanged in beforehand
• MIKEY_PK
– Based on RSA-Public Keys and certificates
• MIKEY_DHSIGN
– signed Diffie-Hellmann-Key Exchange
• MIKEY_DHHMAC
– DH-key exchange authenticated with HMAC

Mehr Karteikarten anzeigen
Q:

MIKEY_PS Advantages/Disadvantages

A:

• Advantages
– fast
– computationally lightweight
– short messages
=>Suitable for wireless scenarios and thin devices
• Disadvantages
– Need to exchange secret K in beforehand
– Bob must use Alice‘s choice of TGK

Q:

MIKEY_PK Advantages/Disadvantages

A:

• Advantages
– No secret exchange in beforehand needed
– Envelope key may be used for further key updates
• Disadvantages
– PKI necessary
– verification of certificates may make further messages necessary
– Expensive Message Generation for Initiator
– Bob must use Alice‘s choice of TGK

Q:

MIKEY_DHSIGN Advantages/Disadvantages

A:

• Advantages
– No secret exchange in beforehand needed
– Both parties take part in generating TGK
• Disadvantages
– PKI needed
– verification of certificates may make further messages necessary
– Expensive Message Generation for both
– pure P2P protocol, no way to generate a group key

Q:

MIKEY_DHHMAC Advantages/Disadvantages

A:

• Advantages
– Both parties take part in generating TGK
– No signatures needed
– No PKI needed
• Disadvantages
– Need to exchange secret K in beforehand
– pure P2P protocol, no way to generate a group key

Q:

Multicast Security Issues

A:

Data Confidentiality

Group Key Management

Data Source Authentication

Security Policies

– Policies concerning group membership
– Policies concerning security enforcement

Q:

Requirements for Group Key Management

A:

• Requirements
– Security
– Efficiency
– Scalability
– Support removing/adding members
• Forward Secrecy
• Backward Secrecy

Q:

• Real Time Transport Protocol (RTP)

A:

– delivering media content after session has been negotiated by SIP

– Marking and Synchronising of sent and received
packets by timestamping

– Unique Sequence Numbers in RTP to ensure correct
packet order

– Identification of packet initiator

Media Security

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