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The Datagram Transport Layer Security (DTLS) protocol provides authentication, data integrity, and confidentiality for communications between two applications over an Unreliable Datagram Protocol (UDP). The Secure Real-time Transport Protocol (SRTP) provides encryption, message authentication and integrity, and replay protection to the RTP data in both unicast and multicast applications. DTLS-SRTP is an extension to the DTLS protocol, where DTLS acts as the key management protocol. DTLS protocol is also extended to negotiate the SRTP crypto suites and parameters for use with those keys.

WebRTC is a signaling protocol defined for real-time communication between Web browsers. WebRTC has assigned DTLS-SRTP protocol for the media exchange between the browsers. The SBC includes the following DTLS functionality:

  • Real-time communication between the web browsers by using DTLS-SRTP while inter-working with SIP networks.
  • DTLS on the media path for key management for the SRTP-based media.
  • The self-signed certificates to secure and authenticate DTLS associations. DTLS connections are secured by the two browsers sharing self-signed certificates as part of the media connection during a DTLS handshake between the browsers. The certificates are authenticated by checking a fingerprint, which is passed in the signaling path as part of the Session Description Protocol (SDP).

The SBC includes DTLS crypto suites that define a set of ciphers (algorithms used for encrypting data) which allow the selection of an appropriate level of security. When a TLS connection is established, the client and server exchange information about which cipher suites they have in common.

To View Dtls Profile

On SBC main screen, go to All > Profiles > Security > Dtls Profile.

The Dtls Profile window is displayed.

Figure : Security - Dtls Profile

 

To Edit Dtls Profile

To edit any of the Dtls Profile in the list, click the radio button next to the specific Dtls Profile name.

Figure : Security - Dtls Profile Highlighted

 

The Edit Selected Dtls Profile window is displayed below.

Figure : Security - Dtls Profile Edit

 

Make the required changes and click Save at the right hand bottom of the panel to save the changes made.

To Create Dtls Profile

To create a new Dtls Profile, click New Dtls Profile tab on the Dtls Profile List panel.

Figure : Security - Dtls Profile Fields

 

The Create New Dtls Profile window is displayed.

Figure : Security - Dtls Profile Create

 

The following fields are displayed:

Table : Dtls Profile Parameters

 

Parameter

Description

NameSpecifies the name of the Dtls Profile created. The value ranges up to 23 characters.

Handshake Timer

Specifies the time in which the Dtls handshake must be completed. The timer starts when the TCP connection is established. Must be 1 - 60 seconds; default is 5.
Session Resump TimerSpecifies the Dtls session resumption period for which cached sessions are retained (in seconds). Dtls allows successive connections to be created within one Dtls session and the resumption of a session after a Dtls connection is closed or after a server card failover, without repeating the entire authentication and other setup steps for each connection, except when the space must be reclaimed for a new session. Must be 0 - 86,400 seconds; default is 300.
Cipher Suite1

Use this parameter to specify the first Dtls Cipher Suite choice for this profile.

  • nosuite
  • rsa-with-aes-128-cbc-sha (default)  Confidentiality cipher and mode for the Dtls Record protocol.
  • rsa-with-aes-128-cbc-sha-256 – Confidentiality cipher and mode for the Dtls Record protocol with SHA-256 as the hash function.

  • rsa-with-aes-256-cbc-sha – Confidentiality cipher and mode for the Dtls Record protocol with AES 256 encryption.  
  • rsa-with-aes-256-cbc-sha-256* Confidentiality cipher and mode for the Dtls Record protocol with AES 256 encryption and SHA-256 as the hash function.

  • rsa-with-null-sha – The integrity cipher used for the Dtls Record protocol. 

  • tls_ecdh_ecdsa_with_aes_256_cbc_sha384** – Confidentiality cipher and mode for Dtls Record with AES256 GCM and SHA384 as hash function.
  • tls_ecdh_ecdsa_with_aes_256_gcm_sha384** – Confidentiality cipher and mode for Dtls Record with AES256 CBC and SHA384 as hash function.

  • tls_ecdhe_rsa_with_aes_256_cbc_sha384* Confidentiality cipher and mode for the Dtls Record protocol using ECDHE (Elliptic Curve Diffie-Hellman key Exchange).

  • tls_ecdhe_rsa_with_aes_128_cbc_sha  Confidentiality cipher and mode for the Dtls Record protocol using ECDHE (Elliptic Curve Diffie-Hellman key Exchange) with AES128 CBC and SHA as hash function.

* To use this cipher, Dtls version 1.2 must be enabled in the Dtls Profile.

** To use this cipher, Dtls version 1.2 must be enabled in the Dtls Profile and SSL certificates must be created using ECC keys.

Warning: When fips-140-2 mode is enabled, rsa-with-null-sha should not be used.

Cipher Suite2

Use this parameter to specify the second Dtls Cipher Suite choice for this profile.

  • nosuite (default)
  • rsa-with-aes-128-cbc-sha (default)  Confidentiality cipher and mode for the Dtls Record protocol.
  • rsa-with-aes-128-cbc-sha-256 – Confidentiality cipher and mode for the Dtls Record protocol with SHA-256 as the hash function.

  • rsa-with-aes-256-cbc-sha – Confidentiality cipher and mode for the Dtls Record protocol with AES 256 encryption.  
  • rsa-with-aes-256-cbc-sha-256* Confidentiality cipher and mode for the Dtls Record protocol with AES 256 encryption and SHA-256 as the hash function.

  • rsa-with-null-sha – The integrity cipher used for the Dtls Record protocol. 

  • tls_ecdh_ecdsa_with_aes_256_cbc_sha384** – Confidentiality cipher and mode for Dtls Record with AES256 GCM and SHA384 as hash function.
  • tls_ecdh_ecdsa_with_aes_256_gcm_sha384** – Confidentiality cipher and mode for Dtls Record with AES256 CBC and SHA384 as hash function.

  • tls_ecdhe_rsa_with_aes_256_cbc_sha384* Confidentiality cipher and mode for the Dtls Record protocol using ECDHE (Elliptic Curve Diffie-Hellman key Exchange).

  • tls_ecdhe_rsa_with_aes_128_cbc_sha  – Confidentiality cipher and mode for the Dtls Record protocol using ECDHE (Elliptic Curve Diffie-Hellman key Exchange) with AES128 CBC and SHA as hash function.

* To use this cipher, Dtls version 1.2 must be enabled in the Dtls Profile.

** To use this cipher, Dtls version 1.2 must be enabled in the Dtls Profile and SSL certificates must be created using ECC keys.

Warning: When fips-140-2 mode is enabled, rsa-with-null-sha should not be used.

Cipher Suite3 

Use this parameter to specify the third Dtls Cipher Suite choice for this profile.

  • nosuite (default)
  • rsa-with-aes-128-cbc-sha (default)  Confidentiality cipher and mode for the Dtls Record protocol.
  • rsa-with-aes-128-cbc-sha-256 – Confidentiality cipher and mode for the Dtls Record protocol with SHA-256 as the hash function.

  • rsa-with-aes-256-cbc-sha – Confidentiality cipher and mode for the Dtls Record protocol with AES 256 encryption.  
  • rsa-with-aes-256-cbc-sha-256* Confidentiality cipher and mode for the Dtls Record protocol with AES 256 encryption and SHA-256 as the hash function.

  • rsa-with-null-sha – The integrity cipher used for the Dtls Record protocol. 

  • tls_ecdh_ecdsa_with_aes_256_cbc_sha384** – Confidentiality cipher and mode for Dtls Record with AES256 GCM and SHA384 as hash function.
  • tls_ecdh_ecdsa_with_aes_256_gcm_sha384** – Confidentiality cipher and mode for Dtls Record with AES256 CBC and SHA384 as hash function.

  • tls_ecdhe_rsa_with_aes_256_cbc_sha384* Confidentiality cipher and mode for the Dtls Record protocol using ECDHE (Elliptic Curve Diffie-Hellman key Exchange).

  • tls_ecdhe_rsa_with_aes_128_cbc_sha  Confidentiality cipher and mode for the Dtls Record protocol using ECDHE (Elliptic Curve Diffie-Hellman key Exchange) with AES128 CBC and SHA as hash function.

* To use this cipher, Dtls version 1.2 must be enabled in the Dtls Profile.

** To use this cipher, Dtls version 1.2 must be enabled in the Dtls Profile and SSL certificates must be created using ECC keys.

Warning: When fips-140-2 mode is enabled, rsa-with-null-sha should not be used.

 

Dtls Role

 Specifies the allowed DTLS roles of this DTLS profile. The options are:

  • Client
  • Server (default)
Hash Type

 Specifies the allowed DTLS hash function for a specified DTLS profile. The options are:

  • Md2
  • Md5
  • Sha1 (default)
  • Sha224
  • Sha256
  • Sha384
  • Sha512
Cert NameSpecifies the name of the certificate referred by a specified DTLS profile. The default value is defaultDtlsSBCCert.
Cookie Exchange

Specifies the state that is, enabled or disabled cookie exchange.

  • disabled
  • enabled (default)
V1_0

Dtls protocol version 1.0.

  • disabled
  • enabled (default)
V1_1

Dtls protocol version 1.1.

  • disabled  (default)
  • enabled
 
V1_2

Dtls protocol version 1.2.

  • disabled (default)
  • enabled

To Copy Dtls Profile

To copy any of the created Dtls Profile and to make any minor changes, click the radio button next to the specific Dtls Profile to highlight the row.

Figure : Security - Dtls Profile Highlighted

 

Click Copy Dtls Profile tab on the Dtls Profile List panel.

Figure : Security - Dtls Profile Fields

 

The Copy Selected Dtls Profile window is displayed along with the field details which can be edited.

Figure : Security - Dtls Profile Copy

 

Make the required changes to the required fields and click Save to save the changes. The copied Dtls Profile is displayed at the bottom of the original Dtls Profile in the Dtls Profile List panel.

To Delete Dtls Profile

To delete any of the created Dtls Profile, click the radio button next to the specific Dtls Profile which you want to delete.

Figure : Security - Dtls Profile Highlighted

 

Click Delete at the end of the highlighted row. A delete confirmation message appears seeking your decision.

Figure : Security - Dtls Profile Delete Confirmation

 

Click Yes to remove the specific Dtls Profile from the list.

 

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