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International Computer Security Day is an awareness observance associated with November 30. A contemporaneous University of British Columbia notice dated November 30, 1994, says the Washington, D.C., chapter of ACM SIGSAC started the observance in 1988 to draw attention to computer security. The notice also explains that the end of November was chosen to keep security in mind during the holiday season.
What is International Computer Security Day?
International Computer Security Day is a reminder to review everyday computer and online-safety practices. The strongest historical evidence is a 1994 University of British Columbia notice by Satnam Purewal. It reports that the Washington, D.C., ACM SIGSAC chapter initiated Computer Security Day in 1988.
The available historical record does not establish a current international governing body, official global campaign administrator, or universally binding schedule. Treat the observance as an awareness prompt rather than a centrally managed holiday.
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When is Computer Security Day?
The observance is associated with November 30. The 1994 notice names November 30 as that year’s date and says the final business day in November was selected to sustain attention to security over the holiday season. That evidence explains the tradition but does not prove a current formal scheduling rule for every year.
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Why is Computer Security Day on November 30?
Late November was practical for an awareness message: the notice says it was intended to keep computer security visible as organizations and individuals moved into the holiday period. Seasonal travel, shopping, gifts, and time away from work can create more occasions to use unfamiliar devices, networks, websites, and messages, making a security reminder timely.
How Computer Security Day differs from Cybersecurity Awareness Month
| Observance | Timing | Scope described by the source |
|---|---|---|
| Computer Security Day | Associated with November 30 | Historically described as an ACM SIGSAC chapter initiative begun in 1988 |
| Cybersecurity Awareness Month | October | NIST says the U.S. government and industry have marked it since 2004 |
These are separate awareness efforts. NIST describes Cybersecurity Awareness Month as a coordinated U.S. government-and-industry campaign, while the available record for Computer Security Day is a historical account of an observance associated with November 30.
How can I participate in Computer Security Day?
Use the date to complete a short security review, then make any needed changes immediately.
- Turn on multifactor authentication. Enable an authenticator app, security key, or other additional sign-in factor wherever an account supports it. A FIDO-compatible hardware security key is an optional physical method; verify that your specific accounts and devices support it before buying one.
- Improve password protection. Use long, unique passwords for important accounts. A password manager can generate and store different passwords so one reused credential does not expose multiple services.
- Install updates. Apply operating-system, browser, phone, application, and router updates from the device or software maker. Turn on automatic updates when that setting is available and appropriate.
- Practise phishing recognition. Treat unexpected requests for passwords, payment, gift cards, codes, or urgent action cautiously. Check the sender and destination through a known channel instead of using a link or phone number in the message.
- Report suspicious messages. Use your organization’s reporting button or the service’s abuse/phishing process, and tell the relevant bank, school, employer, or platform when an account or transaction may be at risk.
- Review recovery options. Confirm that recovery email addresses, phone numbers, backup codes, and trusted devices are current, and remove access you no longer use.
CISA’s Secure Our World materials provide free tip sheets and campaign resources covering multifactor authentication, strong passwords, software updates, and phishing awareness.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What should our workplace or school do for Computer Security Day?
Make the observance the launch or check-in point for an ongoing learning program, not a once-a-year compliance exercise. NIST identifies posters, reminders, email notices, videos, and webinars as awareness techniques, and its SP 800-50 guidance describes a lifecycle approach to security learning programs.
Before November 30
- Choose one or two behaviors relevant to your users, such as MFA enrollment or reporting suspicious email.
- Prepare a short message with the exact help-desk or reporting route.
- Check that account-recovery, update, and incident-reporting instructions are current.
On the observance date
- Send a brief, plain-language notice explaining the behavior and why it matters.
- Offer a live help session, video, webinar, or staffed support period for enrollment and questions.
- Place posters or digital signage where people actually sign in, handle email, or access shared devices.
After November 30
- Repeat reminders at useful intervals instead of relying on one annual message.
- Measure practical indicators such as MFA enrollment, update compliance, and phishing-reporting participation, while respecting privacy and local policy.
- Update the learning plan when systems, threats, or user roles change.
NIST’s 1989 Special Publication 800-12, Chapter 13, summarizes the rationale plainly: “One of the keys to a successful computer security program is security awareness and training.”
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What the observance can—and cannot—do
- It can: create a visible deadline for fixing neglected account settings, refreshing guidance, and making help available.
- It cannot: replace patch management, access controls, backups, incident response, technical monitoring, or continuing education.
- It does not require: purchasing a security product, joining a particular organization, or following a single internationally mandated ceremony.
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