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Bug #1480

A5/3 is not deployed in GSM networks

Added by laforge over 2 years ago. Updated over 2 years ago.

Status:
New
Priority:
High
Assignee:
-
Category:
MS (Mobile Station)
Target version:
-
Start date:
Due date:
% Done:

0%

Estimated time:
Resolution:
Spec Reference:

Description

The 3GPP has specified the Kasumi-derived A5/3 cipher for use in GSM networks. This would significantly increase the confidentiality and security of the GSM network, since it avoids the known-weak and known-broken A5/1 cipher. The passive A5/1 key-cracking attacks would no longer work.

In order to use A5/3, both the MS and the BTS will have to implement the A5/3 cipher, and the BSC will have to configure the BTSs to actually use it.

Many modern phones (whether 3G or not) support A5/3 operation on GSM and indicate this capability in their CLASSMARK.

However, none of the networks we have seen are using A5/3 on GSM.

Thus, the operators and/or equipment manufacturers are actively preventing a higher level of security and confidentiality.

History

#1 Updated by laforge over 2 years ago

  • Assignee deleted (laforge)

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