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Cybersecurity and Infrastructure Security Agency (CISA)

You are subscribed to Cybersecurity Advisories for Cybersecurity and Infras= tructure Security Agency. This information has recently been updated and is=
now available.

CISA Helps Johnny Secure Operational Technology: New Guidance Addresses Cyb=
er Risks from Legacy Protocols [ https://www.cisa.gov/resources-tools/resou= rces/barriers-secure-ot-communication-why-johnny-cant-authenticate ] 02/10/= 2026 02:30 PM EST=20

Today, CISA released the guidance Barriers to Secure OT Communication: Why = Johnny Can=E2=80=99t Authenticate [ https://www.cisa.gov/resources-tools/re= sources/barriers-secure-ot-communication-why-johnny-cant-authenticate ]. Th=
is guidance highlights the known issues with insecure-by-design legacy indu= strial protocols and seeks to understand why the technology to secure these=
protocols is not widely adopted. CISA developed this guidance in partnersh=
ip with operational technology (OT) equipment manufacturers and standard de= velopment organizations, by interviewing OT asset owners and operators to u= nderstand:


* What motivates owners and operators to secure communication, and=20
* What barriers prevent successful adoption from design through deploymen=
t and operations.=20

Legacy OT protocols lack strong protections against data alteration, device=
impersonation, and unauthorized access, making critical infrastructure vul= nerable to cyber threats. Securing these protocols requires solutions that = are practical for current operators as well as cyber experts. Based on the = research conducted, CISA provides recommendations for how owners and operat= ors can avoid the negative experiences of their peers, as well as recommend= ations to OT manufacturers to drive sustainable, more usable capabilities.

*For OT Owners and Operators:*


* Learn why message signing is the foundation for secure OT communication=
and when encryption is essential.=20
* Discover practical strategies for phased adoption of secure protocols t=
o minimize operational risk.=20
* Identify which OT communications should be prioritized for enhanced sec= urity and resilience.=20
* Explore ways to simplify secure workflows and key management for easier=
implementation.=20

*For Manufacturers:*


* Gain insights from customer research to reduce customer friction and de= liver more usable, secure products.=20
* Explore actionable recommendations to address cost and complexity barri= ers to secure communication.=20
* Learn how usability metrics like deployment time and ease of integratio=
n can differentiate your solutions and accelerate adoption.=20

CISA encourages critical infrastructure organizations and OT manufacturers =
to review and implement the recommendations in this guidance. For further d= etails, read the full guidance here [ https://www.cisa.gov/resources-tools/= resources/barriers-secure-ot-communication-why-johnny-cant-authenticate ].

Please share your thoughts with us through this this anonymous survey [ htt= ps://cisasurvey.gov1.qualtrics.com/jfe/form/SV_9n4TtB8uttUPaM6?Source=3DGov= Deliveryhttps://www.cisa.gov/resources-tools/resources/barriers-secure-ot-c= ommunication-why-johnny-cant-authenticate ]. We appreciate your feedback!

This product is provided subject to this=C2=A0Notification [ https://www.ci= sa.gov/notification ]=C2=A0and this=C2=A0Privacy & Use [ https://www.cisa.g= ov/privacy-policy ]=C2=A0policy.

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Having trouble viewing this message?=C2=A0View it as a webpage [ https://co= ntent.govdelivery.com/accounts/USDHSCISA/bulletins/40907ff ].=C2=A0 [ https= ://content.govdelivery.com/accounts/USDHS/bulletins/292141e ]

You are subscribed to updates from the Cybersecurity and Infrastructure Sec= urity Agency [ https://www.cisa.gov ] (CISA)
Manage Subscriptions [ https://public.govdelivery.com/accounts/USDHSCISA/su= bscriber/edit?preferences=3Dtrue#tab1 ]=C2=A0=C2=A0|=C2=A0=C2=A0Privacy Pol= icy [ https://www.cisa.gov/privacy-policy ]=C2=A0=C2=A0|=C2=A0 Help [ https= ://subscriberhelp.granicus.com/s/article/Subscriber-Help-Center ] [ https:/= /insights.govdelivery.com/Communications/Subscriber_Help_Center ]

Connect with CISA:=20
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<title> CISA Helps Johnny Secure Operational Technology: New Guidance Ad= dresses Cyber Risks from Legacy Protocols
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<p><img src=3D"https://content.govdelivery.com/attachments/fancy_images/U= SDHSCISA/2020/06/3486054/05152023-gov-delivery-banner-copy_original.png" al= t=3D"Cybersecurity and Infrastructure Security Agency (CISA)" title=3D"" wi= dth=3D"600" height=3D"100"></p>
<p>You are subscribed to Cybersecurity Advisories for Cybersecurity and I= nfrastructure Security Agency. This information has recently been updated a=
nd is now available.</p>
<div class=3D"rss_item" style=3D"margin-bottom: 2em;">
<div class=3D"rss_title" style=3D"font-weight: bold; font-size: 120%; margi=
n: 0 0 0.3em; padding: 0;"><a href=3D"https://www.cisa.gov/resources-tools/= resources/barriers-secure-ot-communication-why-johnny-cant-authenticate" ta= rget=3D"_blank" title=3D"CISA Helps Johnny Secure Operational Technology: N=
ew Guidance Addresses Cyber Risks from Legacy Protocols" rel=3D"noopener">C= ISA Helps Johnny Secure Operational Technology: New Guidance Addresses Cybe=
r Risks from Legacy Protocols</a></div>
<div class=3D"rss_pub_date" style=3D"font-size: 90%; font-style: italic; co= lor: #666666; margin: 0 0 0.3em; padding: 0;">02/10/2026 02:30 PM EST</div> <div class=3D"l-page-section l-page-section--rich-text csaf-imported">
<div class=3D"l-constrain">
<div class=3D"l-page-section__content">
<p>Today, CISA released the guidance <a href=3D"https://www.cisa.gov/resour= ces-tools/resources/barriers-secure-ot-communication-why-johnny-cant-authen= ticate" target=3D"_blank" title=3D"Barriers to Secure OT Communication: Why=
Johnny Can=E2=80=99t Authenticate" rel=3D"noopener">Barriers to Secure OT = Communication: Why Johnny Can=E2=80=99t Authenticate</a>. This guidance hig= hlights the known issues with insecure-by-design legacy industrial protocol=
s and seeks to understand why the technology to secure these protocols is n=
ot widely adopted. CISA developed this guidance in partnership with operati= onal technology (OT) equipment manufacturers and standard development organ= izations, by interviewing OT asset owners and operators to understand:</p>

<li>What motivates owners and operators to secure communication, and</li> <li>What barriers prevent successful adoption from design through deploymen=
t and operations.</li>
</ol>
<p>Legacy OT protocols lack strong protections against data alteration, dev= ice impersonation, and unauthorized access, making critical infrastructure = vulnerable to cyber threats. Securing these protocols requires solutions th=
at are practical for current operators as well as cyber experts. Based on t=
he research conducted, CISA provides recommendations for how owners and ope= rators can avoid the negative experiences of their peers, as well as recomm= endations to OT manufacturers to drive sustainable, more usable capabilitie= s.</p>
<p><strong>For OT Owners and Operators:</strong></p>

<li>Learn why message signing is the foundation for secure OT communication=
and when encryption is essential.</li>
<li>Discover practical strategies for phased adoption of secure protocols t=
o minimize operational risk.</li>
<li>Identify which OT communications should be prioritized for enhanced sec= urity and resilience.</li>
<li>Explore ways to simplify secure workflows and key management for easier=
implementation.</li>
</ul>
<p><strong>For Manufacturers:</strong></p>

<li>Gain insights from customer research to reduce customer friction and de= liver more usable, secure products.</li>
<li>Explore actionable recommendations to address cost and complexity barri= ers to secure communication.</li>
<li>Learn how usability metrics like deployment time and ease of integratio=
n can differentiate your solutions and accelerate adoption.</li>
</ul>
<p>CISA encourages critical infrastructure organizations and OT manufacture=
rs to review and implement the recommendations in this guidance. For furthe=
r details, read the <a href=3D"https://www.cisa.gov/resources-tools/resourc= es/barriers-secure-ot-communication-why-johnny-cant-authenticate" target=3D= "_blank" title=3D"full guidance here" rel=3D"noopener">full guidance here</= a>.</p>
<p>Please share your thoughts with us through this this <a href=3D"https://= cisasurvey.gov1.qualtrics.com/jfe/form/SV_9n4TtB8uttUPaM6?Source=3DGovDeliv= eryhttps://www.cisa.gov/resources-tools/resources/barriers-secure-ot-commun= ication-why-johnny-cant-authenticate" target=3D"_blank" title=3D"anonymous = survey" rel=3D"noopener">anonymous survey</a>. We appreciate your feedback!=

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<div class=3D"c-field c-field--name-body c-field--type-text-with-summary c-= field--label-hidden">
<div class=3D"c-field__content">
<p>This product is provided subject to this=C2=A0<a href=3D"https://www.cis= a.gov/notification" target=3D"_blank" title=3D"Notification" rel=3D"noopene= r">Notification</a>=C2=A0and this=C2=A0<a href=3D"https://www.cisa.gov/priv= acy-policy" target=3D"_blank" title=3D"Privacy &amp; Use" rel=3D"noopener">= Privacy &amp; Use</a>=C2=A0policy.</p>
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