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| What does AKA authenticate between? |
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Definition
Network and user
User and network
(Mutual authentication) |
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Term
| What two keys does AKA establish? |
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| What was AKA designed to achieve? |
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Definition
| Maximum compatibility with GSM |
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| What protocol is AKA based upon? |
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| What are the four AKA pre-requisites? |
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Definition
AuC and USIM share
AuC has a randon number generator
AuC has scheme to generate fresh sequence numbers
USIM has scheme to verify freshness of sequence numbers |
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| What is a key specific to? |
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Definition
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| Random challenge generated by AuC |
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| Expected user response computed by AuC |
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| Actual user response computed by USIM |
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| What is the AK used to do? |
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| Authentication management field |
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| Network authentication token |
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Term
| What goes in to generate the AUTN? |
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Term
| You have the AUTN, which consists of the SQN+AK / AMF / MAC as well as the RAND. How do you regenerate the SQN at the 'other end'? |
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Definition
| You generate the AK by putting your RAND and KEY in. You minus the AK from the AK+SQN which gives you the SQN. |
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Term
| What do you verify the SQN For? |
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Definition
| That it is in the correct range |
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Term
| When a user authentication requests comes from the VLR / SGSN to the mobile station, what two values are sent? |
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Definition
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Term
| What does the mobile station do when it receives the user auth requests (It has the AUTN and RAND) |
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Definition
| Verify the AUTN and compute the RES |
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Term
| When a mobile statioc senda a user auth response what does he send with it? |
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Definition
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Term
| What does the mobile station do after the user auth response is sent? |
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Definition
| Compute the cipher and integrity key |
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Term
| When the VLR / SGSN (The service network basically) sends an authentication data request to the HE / HLR (The home env.) what does the HE do? |
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Definition
| Generate authentication vectors |
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Term
| What happens after the HE generates the auth vectors? |
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Definition
| The HE sends the auth data response which the VLR / SGSN stores |
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Term
| What does the VLR / SGSN do when he receives the user auth response from the MS (consisting of the RES) |
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Definition
It compares the RES to the XRES
Then selects the CK and IK. |
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