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How to Ensure Digital Certificates Have Not Been Tampered

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In order for digital certificates to be trusted, it is vital that they have not been tampered with. There are many ways to check whether or not a digital certificate has been tampered with, and it is crucial to be aware of them. Here are seven ways to ensure digital certificates have not been tampered.

Check the Certificate Chain

In order for digital certificates to be effective, it is essential that they have not been tampered with. One way to verify that a certificate has not been tampered with is to check the certificate chain. The certificate chain includes all of the Certificate Authorities (CAs) that have signed the certificate. Each CA has its private key, which it uses to sign the certificates it issues. When checking a certificate chain, the browser will use the CAs’ public keys to verify that the signatures on the certificates are valid. If any of the signatures are invalid, the browser will know that the certificate has been tampered with and will not allow it to be used.

Another way to ensure that digital certificates have not been tampered with is to use symmetric vs. asymmetric encryption. With symmetric encryption, there is only one key that is used to both encrypt and decrypt data. This means that if someone were to obtain this key, they would be able to read any data that had been encrypted with it.

On the other hand, asymmetric encryption uses two different keys – a public key and a private key. The public key can be freely distributed, but the private key must be kept secret. Data encrypted with the public key can only be decrypted with the private key, so even if someone were to obtain the public key, they would not be able to read the encrypted data. This makes asymmetric encryption much more secure than symmetric encryption and helps to ensure that digital certificates have not been tampered with.

Check the Certificate’s Status using Online Certificate Status Protocol (OCSP)

When you visit a website, your browser checks to see if the site’s digital certificate is valid. If the certificate is correct, the browser can be confident that the site is who it claims to be. However, if the certificate has been tampered with, it could allow an attacker to impersonate the site and eavesdrop on your communications.

Online Certificate Status Protocol (OCSP) is a mechanism that allows your browser to check the status of a digital certificate in real time. By querying an OCSP server, the browser can determine whether or not a certificate has been revoked. This is important because it allows you to ensure that your communications are secure, even if an attacker has managed to compromise a digital certificate.

However, it should be noted that OCSP only works for certificates that use asymmetric encryption; for credentials that use symmetric encryption, you will need to rely on other methods to ensure their validity.

Use Certificate Transparency Logs

Certificate Transparency is a project developed by Google to improve the security of digital certificates. The project requires all Certificate Authorities (CAs) to log all issued certificates in a public database. This allows anyone to check whether or not a particular certificate has been tampered with.

If a certificate has been tampered with, the Certificate Authority that issued it will likely be listed in the Certificate Transparency Logs. This is because the attacker would need access to the CA’s private key to generate a fake certificate. As such, checking the Certificate Transparency Logs is an excellent way to ensure that a digital certificate has not been tampered with.

Inspect the Certificate’s Signature

A digital signature is used to verify the website or individual operating the certificate’s identity. However, it can also be used to check whether or not the certificate has been tampered with.

If a digital signature has been tampered with, the signature will likely be different from the one listed on the certificate. As such, inspecting the certificate’s signature is an excellent way to ensure that a digital certificate has not been tampered with.

Examine the Certificate’s Subject and Issuer Fields

The subject and issuer fields of a digital certificate contain information about who issued the certificate and to who it was published. This information can verify the website’s identity or the individual operating the certificate. However, it can also be used to check whether or not the certificate has been tampered with.

If a digital certificate has been tampered with, the information in the subject and issuer fields will likely differ from the information listed in the certificate. Examining the certificate’s subject and issuer fields is an excellent way to ensure that a digital certificate has not been tampered with.

Compare the Hash Values of the Certificate

A digital certificate contains a hash value that can be used to verify the certificate’s integrity. If the hash value has been tampered with, likely, the certification has also been tampered with. As such, comparing the hash values of the certificate is an excellent way to ensure that a digital certificate has not been tampered with.

Conclusion

These are just some ways to ensure digital certificates are not tampered with. It is essential to be aware of all of them to maintain comprehensive security.

From television to the internet platform, Jonathan switched his journey in digital media with Bigtime Daily. He served as a journalist for popular news channels and currently contributes his experience for Bigtime Daily by writing about the tech domain.

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AI in Placemaking: How ERA-co is Using Smarter Data to Build Better Cities

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ERA-co is exploring new ways to apply AI in urban design, utilizing data-driven tools to support more thoughtful and responsive placemaking. Rather than replacing human insight, the firm sees artificial intelligence as a partner — one that can enhance how designers understand and shape the spaces where people live, move, and connect. 

This approach isn’t about flashy tech or fully automated cities. It’s about asking better questions, revealing patterns we might otherwise miss, and using that knowledge to make decisions rooted in real-world behavior. For ERA-co, AI becomes most valuable when it helps clarify how a city works, layer by layer, so design teams can create places that are not only efficient but also livable and meaningful. 

Understanding complexity before optimization

Before talking about smart tools or predictions, ERA-co begins with a foundational question: “What kind of problem is a city?” Nicolas Palominos, Head of Urban Design and Strategy R&D at ERA-co, references the work of Jane Jacobs to frame this. 

“As Jacobs reminds us, cities exhibit complex system behavior, where multiple elements vary simultaneously, in subtle interconnected ways,” Palominos explains. “AI can augment our understanding of these parameters to design better places with optimized social benefit.”

According to Palominos, that kind of social benefit can take many forms. It might involve modeling a housing system that supports proximity-based living, such as the concept of the “15-minute city,” or applying predictive analytics to anticipate and respond to events like floods, heatwaves, or infrastructure failures. 

ERA-co doesn’t use AI to chase efficiency for its own sake. Instead, the firm uses it to gain a more comprehensive understanding and a clearer picture of a place’s behavior. 

Data that matches people, not just places

Not all data is created equal. When it comes to placemaking, ERA-co prioritizes what Palominos calls “spatial and temporal granularity,” which entails not only examining how a space functions on a map but also understanding how people interact with it over time — from hour to hour, and season to season. 

“The most valuable data are those with the greatest spatial and temporal granularity for observing people and urban environments,” Palominos says. “Video footage, mobile data, street view imagery, and satellite imagery enable a deeper understanding of how different groups of people perceive and use public space.”

One recent ERA-co proof-of-concept used AI to assess how people visually perceive streetscapes, analyzing elements like enclosure, complexity, and human scale. These insights informed more nuanced design strategies that align with local behaviors, not just abstract zoning plans. 

This level of detail matters because even small design shifts can have ripple effects on how people move, feel, and gather. With AI, ERA-co isn’t just tracking patterns but learning from them.  

ERA-co’s AI mobility work: Subtle shifts, broader benefits

Some of the clearest applications of AI can be seen in mobility — how people and goods move through cities. It’s here that ERA-co sees measurable gains in both function and experience. 

“AI-driven fleet optimization balances supply and demand in bus services and bike-share systems,” Palominos says. “On the consumer side, it streamlines courier and delivery services through route optimization.”

These systems don’t operate in isolation. When they’re better coordinated, they can relieve pressure on road networks, reduce congestion, and lower energy use. But what makes ERA-co’s approach different is that it doesn’t stop at logistics. It examines how those systems impact the daily lives of people who live in and move through a place. 

The limits of AI and the role of design judgment

As much as AI can help us see more, ERA-co is careful not to let it make the final call. Cities are more than just systems — they’re layered with memory, identity, and human connection. And not everything meaningful can be measured. 

“There have been cases where AI insights pointed us in one direction, but human judgment and cultural understanding led us another way,” Palominos notes. 

Sometimes a place functions well on paper, but feels hollow in practice. Other times, a community gathering space might disrupt traffic flow, yet provide invaluable support for social well-being. 

This is where design intuition becomes critical. ERA-co uses AI to inform, not dictate, the design process. 

Planning for a future in flux

Looking ahead, ERA-co sees AI playing a growing role in helping cities adapt — not just to top physical threats like climate change, but also to slower, less visible shifts in how people live and connect. 

“AI will amplify our understanding of how cities function through enhanced spatial representation and analysis, informing better human decision-making,” Palominos says. He references recent findings (like an MIT study showing people walk faster and linger less in public spaces) as examples of trends that would have been hard to anticipate without AI. 

Still, the goal isn’t to automate responses to those behaviors. It’s using those insights to reimagine what kinds of public spaces people may need in the future, especially as patterns of connection and isolation shift.

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