Product Documentation

ECDHE ciphers

All Citrix ADC appliances support the ECDHE cipher group on the front end and the back end. On an SDX appliance, if an SSL chip is assigned to a VPX instance, the cipher support of an MPX appliance applies. Otherwise, the normal cipher support of a VPX instance applies.

For more information about the builds and platforms that support these ciphers, see Ciphers available on the Citrix ADC appliances.

ECDHE cipher suites use elliptical curve cryptography (ECC). Because of its smaller key size, ECC is especially useful in a mobile (wireless) environment or an interactive voice response environment, where every millisecond is important. Smaller key sizes save power, memory, bandwidth, and computational cost.

A Citrix ADC appliance supports the following ECC curves:

  • P_256
  • P_384
  • P_224
  • P_521

Note: If you upgrade from a build earlier than release 10.1 build 121.10, you must explicitly bind ECC curves to your existing SSL virtual servers or front end services. The curves are bound by default to any virtual servers or front end services that you create after the upgrade.

You can bind an ECC curve to SSL front-end entities only. By default all four curves are bound, in the following order: P_256, P_384,P_224,P_521. To change the order, you must first unbind all the curves, and then bind them in the desired order.

Unbind and bind ECC curves to an SSL virtual server by using the CLI

At the command prompt, type:

unbind ssl vserver \<vServerName\> -eccCurveName ALL  

bind ssl vserver \<vServerName\> -eccCurveName \<eccCurveName\>

Example:

unbind ssl vs v1 –eccCurvename ALL

bind ssl vserver  v1 -eccCurveName P_224

> sh ssl vserver v1

Advanced SSL configuration for VServer v1:
DH: DISABLED
Ephemeral RSA: ENABLED Refresh Count: 0
Session Reuse: ENABLED Timeout: 120 seconds
Cipher Redirect: DISABLED
SSLv2 Redirect: DISABLED
ClearText Port: 0
Client Auth: DISABLED
SSL Redirect: DISABLED
Non FIPS Ciphers: DISABLED
SNI: DISABLED
SSLv2: DISABLED SSLv3: ENABLED TLSv1.0: ENABLED  TLSv1.1: DISABLED  TLSv1.2: DISABLED
Push Encryption Trigger: Always
Send Close-Notify: YES
ECC Curve: P_224

1) Cipher Name: DEFAULT
Description: Predefined Cipher Alias
Done

ECDHE ciphers