Difference between Version 1.4 and Version 1.5 of 128-EEA3 and 128-EIA3

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Difference between Version 1.4 and Version 1.5 of 128-EEA3 and 128-EIA3

Post  zeshan on Wed Feb 09, 2011 10:31 pm

Whats the difference between Version 1.4 and Version 1.5 of 128-EEA3 and 128-EIA3.

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Re: Difference between Version 1.4 and Version 1.5 of 128-EEA3 and 128-EIA3

Post  Steve Babbage on Thu Feb 10, 2011 3:39 am

Whats the difference between Version 1.4 and Version 1.5 of 128-EEA3 and 128-EIA3.
It's explained in detail in the design and evaluation report that you can find here: GSM Security Algorithms. Look for "3GPP Confidentiality and Integrity Algorithms 128-EEA3 & 128-EIA3", and Document 4 is the design and evaluation report. Sections 6, 8.1.2 and 8.3.2 are the ones you'll particularly want to look at.

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Main Defference

Post  Muf on Wed Apr 06, 2011 11:08 pm

What is the difference between version 1.4 and 1.5 in generating the MAC (128-EIA3) ?
for the padding of 1 bit, where suppose to be padded at the begging of the message or at the end?

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Re: Main Defference

Post  Steve Babbage on Thu Apr 07, 2011 9:42 am

The '1' bit is still added to the end of the message, the same as in version 1.4. The difference is in the choice of the 32-bit "mask string" that is XORed onto the Universal Hash Function (UHF) output. In version 1.4, the mask string consisted of the 32 ZUC output bits immediately following the last ZUC output bit used in the UHF computation; this 32-bit string would generally span two ZUC output words. In the new version 1.5, the mask string is always a single ZUC output word (not used in the UHF computation).

All of this is described in section 8.3 of the design and evaluation report.

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Re: Difference between Version 1.4 and Version 1.5 of 128-EEA3 and 128-EIA3

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