Anonymizers, Class 11

``` Page 1

CIS-5374:  5.April.2012
1
Class 11
Anonymizers
Page 2

CIS-5374:  5.April.2012
1
Class 11
Anonymizers
CIS-5374:  5.April.2012
2
? Homework 2 due now
? Homework 3 is out
? Due next week, Thu. April 12 before class
? Same thing as now
Announcement
Page 3

CIS-5374:  5.April.2012
1
Class 11
Anonymizers
CIS-5374:  5.April.2012
2
? Homework 2 due now
? Homework 3 is out
? Due next week, Thu. April 12 before class
? Same thing as now
Announcement
CIS-5374:  5.April.2012
3
? Prove that the Guillou-Quisquater ZK proof of identity is
sound
Homework 2: Problem 2
Page 4

CIS-5374:  5.April.2012
1
Class 11
Anonymizers
CIS-5374:  5.April.2012
2
? Homework 2 due now
? Homework 3 is out
? Due next week, Thu. April 12 before class
? Same thing as now
Announcement
CIS-5374:  5.April.2012
3
? Prove that the Guillou-Quisquater ZK proof of identity is
sound
Homework 2: Problem 2
CIS-5374:  5.April.2012
4
? Completeness
? If the statement is true, the honest verifier (that is, one
following the protocol properly) will be convinced of
this fact by an honest prover.
? Soundness
? If the statement is false, no cheating prover can
convince the honest verifier that it is true, except with
some small probability.
? Zero-knowledge
? If the statement is true, no cheating verifier learns
anything other than this fact
ZK Proofs: Properties
Page 5

CIS-5374:  5.April.2012
1
Class 11
Anonymizers
CIS-5374:  5.April.2012
2
? Homework 2 due now
? Homework 3 is out
? Due next week, Thu. April 12 before class
? Same thing as now
Announcement
CIS-5374:  5.April.2012
3
? Prove that the Guillou-Quisquater ZK proof of identity is
sound
Homework 2: Problem 2
CIS-5374:  5.April.2012
4
? Completeness
? If the statement is true, the honest verifier (that is, one
following the protocol properly) will be convinced of
this fact by an honest prover.
? Soundness
? If the statement is false, no cheating prover can
convince the honest verifier that it is true, except with
some small probability.
? Zero-knowledge
? If the statement is true, no cheating verifier learns
anything other than this fact
ZK Proofs: Properties
CIS-5374:  5.April.2012
5
Guillou-Quisquater: ZK Proof of Identity
Victor
Peggy
public key:
v, n=pq
p, q - primes
Identity J:
H(name, validity, bank #, …)
J
1
Pick random 1 < r < n-1
2
Pick random 0 < d < v-1
4
private key = primes p, q &
B:
J B
v
= 1 mod n
T = r
v
mod n
3
d
5
D = rB
d
mod n
6
T’ = D
v
J
d
mod n
7
if T’ = T success !
```

## FAQs on Anonymizers, Class 11

 1. What is an anonymizer?
An anonymizer is a tool or service that allows users to browse the internet anonymously by hiding their IP address and encrypting their online activities. It helps protect the privacy and anonymity of users by making it difficult for third parties to track their online behavior or identify their real identity.
 2. How does an anonymizer work?
An anonymizer works by acting as an intermediary between the user and the websites or services they visit. When a user accesses a website through an anonymizer, their request is first sent to the anonymizer server. The server then forwards the request to the website, while masking the user's IP address and encrypting their data. This process helps to hide the user's identity and location from the website or any other entities monitoring the internet traffic.
 3. What are the advantages of using an anonymizer?
Using an anonymizer offers several advantages. Firstly, it helps protect the privacy and anonymity of users, as their real IP address and location are hidden. This can be particularly useful in preventing online tracking, targeted advertising, or surveillance. Secondly, an anonymizer can bypass certain internet restrictions or censorship imposed by governments or organizations, allowing users to access blocked websites or content. Additionally, it can protect users' sensitive data, such as login credentials or financial information, by encrypting their online activities.
 4. Are there any limitations or drawbacks to using an anonymizer?
While anonymizers can provide enhanced online privacy and security, they also have limitations. Some websites or online services may detect and block traffic coming from anonymizer servers, restricting access to certain content. Moreover, the use of anonymizers can sometimes slow down internet connection speeds due to the additional routing and encryption processes involved. Additionally, it's important to note that while an anonymizer can hide a user's IP address, it cannot completely guarantee anonymity as other factors, such as browser fingerprinting or user behavior, can still be used to identify individuals.
 5. Are anonymizers legal to use?
The legality of using anonymizers varies depending on the jurisdiction and the purpose of their usage. In many countries, using anonymizers for legitimate purposes, such as protecting privacy or bypassing censorship, is generally legal. However, there may be restrictions or regulations in place, particularly when it comes to using anonymizers for illegal activities, such as hacking, cybercrime, or accessing illegal content. It's essential to comply with the laws and regulations of your country when using anonymizers to ensure you are using them within legal boundaries.
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