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1
u
ATK
2
a
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4
a
N
4
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2
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2
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P
b
2
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2
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2
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2
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1
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a
K
2
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U
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1
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a
2
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1
Step 2 = U
1
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a
2
and authentication information to AS
1
Step 3 = AS
1
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u
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4
4
Step 3a = AS
4
extracts K
1
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1
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2
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a
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2
Step 5 = S
2
returns service information to AS
2
Step 5a = AS
2
relays service information to AS
4
Step 6 = AS relays service information to AS
4
1
Step 7 = AS
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sends service information and K
1
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to U
1
1
2
7
8
6
3
5a
3a
AS
4
S
4
5
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AS
AS
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Step 4 = AS
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1
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