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Chapter 8: Problem 24

Using the browser of your choice, find out what certification authorities for HTTPS your browser is configured by default to trust. Do you trust these agencies? Find out what happens when you disable trust of some or all of these certification authorities.

Short Answer

Expert verified
Access browser settings, view and possibly disable some trusted certification authorities, and test how it affects HTTPS website behavior.

Step by step solution

01

- Access Browser Settings

Open your preferred web browser. Go to the settings or preferences menu. This is usually found by clicking on the three dots or lines in the upper right corner of the browser window.
02

- Locate Security or Privacy Settings

Within the settings menu, find the section related to security or privacy. Here, look for options related to HTTPS or certificates.
03

- View Trusted Certification Authorities

Look for a button or link that says 'Manage certificates' or 'View trusted certificates'. Click this option to see the list of certification authorities that your browser trusts by default.
04

- Evaluate Trust

Review the list of trusted certification authorities. Consider researching some of these authorities to form an opinion on whether you trust them.
05

- Disable Some Certification Authorities

Within the same 'Manage certificates' section, look for the option to disable or remove certain certification authorities. Try disabling a few to observe the effects.
06

- Test Browser Behavior

After disabling some certification authorities, try visiting a few HTTPS websites. Observe if any security warnings or errors appear indicating that the website's certificate cannot be trusted.
07

- Reflect and Conclude

Reflect on whether the changes you made affected your browsing experience in a meaningful way. Decide if you are comfortable keeping certain certification authorities disabled or if you prefer to restore the default settings.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

HTTPS certification authorities
HTTPS certification authorities (CAs) are essential for establishing a secure connection between your browser and the websites you visit. They issue digital certificates that vouch for the legitimacy of websites. When you access a site, the browser checks the certificate against a list of trusted CAs.
Without these trusted authorities, browsers cannot verify the security of a connection. Certification Authorities undergo rigorous audits to ensure they adhere to high standards of security.
Disabling a certification authority can result in security warnings when browsing because the browser cannot validate the website's certificate. This ensures that fraudulent or malicious sites cannot pose as legitimate ones.
  • CAs are trusted entities that validate various websites.
  • Browsers have a default list of trusted CAs.
  • HTTPS secures data transfer between users and websites.
Certificate management
Certificate management involves overseeing digital certificates to ensure secure communication between browsers and websites. This includes issuing, renewing, and revoking certificates.
In your browser settings, you can view and manage these certificates. There are options to add new ones, disable existing ones, or delete them.
Disabling a certificate can help test website security. When you remove trust from a certificate, the browser will alert you if a site鈥檚 certificate is not trusted.
  • Regularly update and check certificates in your browser.
  • Understand how to enable or disable certificates.
  • Use certificate management tools provided by your browser.
Web security
Web security is crucial in protecting your information online. HTTPS and digital certificates are fundamental components of web security as they encrypt data exchanged between your computer and websites.
By securing these connections, HTTPS ensures that sensitive information like passwords and credit card numbers are not intercepted by malicious actors. Web security also involves regular updates to browsers and cautious behavior online.
Regularly reviewing your browser鈥檚 security settings can help maintain robust web security.
  • Ensure HTTPS is enabled on frequently visited sites.
  • Be aware of browser security warnings.
  • Keep your browser and operating system updated.

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Most popular questions from this chapter

Suppose two people want to play poker over the network. To "deal" the cards they need a mechanism for fairly choosing a random number \(x\) between them; each party stands to lose if the other party can unfairly influence the choice of \(x\). Describe such a mechanism. Hint: You may assume that if either of two bit strings \(x_{1}\) and \(x_{2}\) are random, then the exclusive-OR \(x=x_{1} \oplus x_{2}\) is random.

Suppose you are doing RSA encryption with \(p=101, q=113\), and \(e=3 .\) (a) Find the decryption exponent \(d\). (Hint: Although there are methodical ways to do this, trial and error is efficient for \(e=3 .\) ) (b) Encrypt the message \(m=9876\). Note that evaluating \(m^{3}\) with 32 -bit arithmetic results in overflow.

Suppose that RSA is used to send a message \(m\) to three recipients, who have relatively prime encryption moduli \(n_{1}, n_{2}\), and \(n_{3} .\) All three recipients use the same encryption exponent \(e=3\), a once-popular choice as it makes encryption very fast. Show that someone who intercepts all three encrypted messages \(c_{1}=m^{3}\) \(\bmod n_{1}, c_{2}=m^{3} \bmod n_{2}\), and \(c_{3}=m^{3} \bmod n_{1}\) can efficiently decipher \(m .\) Hint: The Chinese remainder theorem implies that you can efficiently find a \(c\) such that \(c=c_{1} \bmod n_{1}, c=c_{2} \bmod n_{2}\), and \(c=c_{3} \bmod n_{3} .\) Assume this, and show that it implies \(c=m^{3} \bmod n_{1} n_{2} n_{3} .\) Then note \(m^{3}

Suppose we have a very short secret \(s\) (e.g., a single bit or even a Social Security number), and we wish to send someone else a message \(m\) now that will not reveal \(s\) but that can be used later to verify that we did know \(s\). Explain why \(m=\operatorname{MD} 5(s)\) or \(m=\mathrm{E}(s)\) with RSA encryption would not be secure choices, and suggest a better choice.

Suppose that at round \(i\) in DES, \(L_{i-1}\) is all 0 s, \(R_{i-1}\) is (in hex) deadbeef, and \(K_{i}\) is a5bd96 860841 . Give \(R_{i}\), assuming that we use a simplified \(\mathrm{S}\) box that reduces each 6-bit chunk to 4 bits by dropping the first and last bits.
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