3 Gpp Tsg
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چکیده
According to [1] Sect 8.1.1, the encryption key CK ESP shall be obtained from the key CK IM established as a result of the AKA procedure, using a suitable key expansion function, the latter to be specified in Annex I. Below, we study two alternatives for key expansion functions meeting the above length requirements and their security properties. We first note that the key CK IM is 128 bits in length, and that the specified DES-EDE3-CBC algorithm requires 192 bits of key material, whereas the later-to-be-added AES algorithm requires 128 bit keys. We make the following basic assumptions: • The option of modifying the use of AKA to derive more key material is ruled out. • Any future need for keys longer than 192 bits is unlikely.
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3 Gpp Tsg
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