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From: "Hollyman, Michael" <mhollyman@verisign.com>
To: "job=40fastly.com@dmarc.ietf.org" <job=40fastly.com@dmarc.ietf.org>,
 "sidrops@ietf.org" <sidrops@ietf.org>
Thread-Topic: [EXTERNAL] [Sidrops] Fermat Attack on RSA (TL; DR: no bad keys in
 the RPKI)
Thread-Index: AQHZJd9iF/8evf4FTEavbg2igF3iWK6cf7eA
Date: Fri, 13 Jan 2023 17:43:08 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/sidrops/IGaeAb6CU2pmpy9QYj4_9o3FeoE>
Subject: Re: [Sidrops] Fermat Attack on RSA (TL; DR: no bad keys in the RPKI)
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Job, thanks for sharing this and doing the leg-work to test the certificate=
s and objects.
A bonus is, I can work on my French reading the paper from 1643. __=20

Mike

=EF=BB=BFOn 1/11/23, 10:08 AM, "Sidrops on behalf of Job Snijders" <sidrops-bounc=
es@ietf.org <mailto:sidrops-bounces@ietf.org> on behalf of job=3D40fastly.com@=
dmarc.ietf.org <mailto:40fastly.com@dmarc.ietf.org>> wrote:


Caution: This email originated from outside the organization. Do not click =
links or open attachments unless you recognize the sender and know the conte=
nt is safe.=20


Dear all,


Hanno B=C3=B6ck published a paper "Fermat Factorization in the Wild" [1]
documenting an issue resulting from flawed RSA key generation functions.
More information: https://secure-web.cisco.com/1_K4CcvwrSEXEv8Sy8_-ybuTnW4H=
lBZxzzcvrrDKw60jmN-M6IOI5rhpdorEHIWiZXweNHXdmkdsoOp7dptcn6_vkh6_IRW2ps92cwXs=
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54HUEYz98-OHCI_ARstlbuehXO-H4_I8bIu1yNU6hUKJ-dDj7jWrYQiXd8UOhEypJeEINVa13Dlq=
OohvufSWRqsYElJTxJo5BnNuL-H6N98VjuiUr7HPWhNfzZRo7lnGp9V52Vav-hgod/https%3A%2=
F%2Ffermatattack.secvuln.info%2F <https://secure-web.cisco.com/1_K4CcvwrSEXE=
v8Sy8_-ybuTnW4HlBZxzzcvrrDKw60jmN-M6IOI5rhpdorEHIWiZXweNHXdmkdsoOp7dptcn6_vk=
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hgod/https%3A%2F%2Ffermatattack.secvuln.info%2F>


The author also published a convenient utility to scan CA & EE X.509
certificates for known issues: https://secure-web.cisco.com/1DQRuWwoh-EZ-Wp=
LXo5LCvrIhJspoPXcHXV9iHyClgzmEHafpq2qi90up2n4bpWbuGH1uh3fY8fhdDw_bgN4FqoN5iY=
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Sk/https%3A%2F%2Fgithub.com%2Fbadkeys%2Fbadkeys <https://secure-web.cisco.co=
m/1DQRuWwoh-EZ-WpLXo5LCvrIhJspoPXcHXV9iHyClgzmEHafpq2qi90up2n4bpWbuGH1uh3fY8=
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Qit0pFinm8ha5HNR-Sk/https%3A%2F%2Fgithub.com%2Fbadkeys%2Fbadkeys>


I scanned all currently valid RPKI certificates & signed objects and
found no bad keys. I suppose this is good news :-)


Kind regards,


Job


[1]: https://secure-web.cisco.com/1fLPbH53FioahJJukH4V9U2Ad41OWLvOiVmoJkNJo=
OQR-Rf5qxrbj6I8gZ6gM9MdTTTokKifhzVkzo21zz-qoBkNK2ikdIkYG5zT9E-YnDnLIVGhlbQ6i=
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6hsgxQyFoE_e0BN0PRvBpk9qLBXdVq-Fq4eOyJpDFj8pjUlIcN9Q/https%3A%2F%2Feprint.ia=
cr.org%2F2023%2F026.pdf <https://secure-web.cisco.com/1fLPbH53FioahJJukH4V9U=
2Ad41OWLvOiVmoJkNJoOQR-Rf5qxrbj6I8gZ6gM9MdTTTokKifhzVkzo21zz-qoBkNK2ikdIkYG5=
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s%3A%2F%2Feprint.iacr.org%2F2023%2F026.pdf>=20


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--B_3756451387_3569684059--

