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#1 2017-05-08 09:29:59

iceman
Administrator
Registered: 2013-04-25
Posts: 6,179
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AUT64 algo used on Temic e5561?

Have someone heard of AUT64 crypto algo and its implementation? 

Temic e5561,  125Khz,

AUT64 is a 64bit block cipher.


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#2 2017-05-08 09:56:35

Onisan
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From: London
Registered: 2016-07-18
Posts: 77

Re: AUT64 algo used on Temic e5561?

Didn't Kasper and Oswald discuss it in their paper "Lock It and Still Lose It" way back when?


Hardware: Proxmark RV2,  Elatec TWN4 dev kit / ACS ACR122U / IDTronic LF Reader / OmniKey 5321 / HT108 RW / Custom Read Write 125khz RW and a couple of other RW bits.

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#3 2017-05-08 10:13:10

iceman
Administrator
Registered: 2013-04-25
Posts: 6,179
Website

Re: AUT64 algo used on Temic e5561?

Cool didn't remember that one.

VW-2, VW-3 uses AUT64 with 12 rounds,  and starting from page 934 mentions AUT64. ref: https://www.usenix.org/system/files/con … garcia.pdf   

Orginal crypto states 8-24 rounds.

This means that the same AUT64 key is stored in millions of ECUs and RKE remotes,
without any key diversification being employed at all.
...
the global AUT64 masterkeys for VW-2 and VW-3 are different, but both can be extracted from the ECU firmware
and possibly from the μC in the remotecontrol as well

VW-4 uses XTEA.

e5561 datasheet explains AUT64 also. ref http://media.digikey.com/pdf/Data%20She … /E5561.pdf


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#4 2019-03-07 15:58:56

iceman
Administrator
Registered: 2013-04-25
Posts: 6,179
Website

Re: AUT64 algo used on Temic e5561?

Found another paper,
https://tches.iacr.org/index.php/TCHES/ … ew/874/826

by
Christopher Hicks
Flavio D. Garcia   (familiar name)
David Oswald   (is this one to Chaos brothers?)


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