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A8 algorithm can be used to generate 32 bit SRES from 128 bit secret key and...

A8 algorithm can be used to generate 32 bit SRES from 128 bit secret key and 128 bit RAND.(True or False)

To authenticate MS, the MSC needs to send SRES to MS for verification.(True or False)

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Answer #1

Ques:A8 algorithm can be used to generate 32 bit SRES from 128 bit secret key and 128 bit RAND.

Ans:False

Reason: Because when RAND and secret key are input into the A8 encryption algorithm. The output is the 64 bit kc.

Kc is the session key of encryption.

Ki is the authentication ​​​​​​​​​​​

Ques: To authenticate MS, the MSC needs to send SRES to MS for verification.

Ans: True

Description: The RAND and the ki are inputted into the A3 encryption algorithm. The output is 32 bit SRES. The SRES is 'challenge' sent to the MS when authentication is required.

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