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Authentication dam reguesr

Distribution of authentication vectors from HE

Generate authentication vectors AV(l..n)

E

Authentication data response AV(l..n)

Storę authentication vectors

Select authentication ve

User authentication reąuest RAND® || AUTN(i)

ID

Veiify AUTN(i) Compute RES(i)

0-

User authentication response RES(i)

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Authentication and key establishment

p7~|    Compare RES(i) and XRES(i)

Compute CK(i) and IK(i)

Select CK(i) and IK(i)

Figurę 7: Authentication and key agreement (from [3]).

COUNT-I DIRECTION ^ MESSAGE | FRESH

f 9

COUNT-I DIRECTION

MESSAGE FRESH

Figurę 8: Derivation of Message Authentication Codes from signaling data using the f9 algorithm