What is a proxy server?

What is a proxy server?

A proxy server is computer that functions as an intermediary between a web browser (such as Internet Explorer) and the Internet. Proxy servers help improve web performance by storing a copy of frequently used webpages. When a browser requests a webpage stored in the proxy server's collection (its cache), it is provided by the proxy server, which is faster than going to the web. Proxy servers also help improve security by filtering out some web content and malicious software.

Proxy servers are used mostly by networks in organizations and companies. Typically, people connecting to the Internet from home will not use a proxy server.

http://windows.microsoft.com

Payphone - Maroon 5 (Jayesslee)

what is mitm attack?

 In cryptography and computer security, a man-in-the-middle attack (often abbreviated to MITM, MitM, MIM, MiM or MITMA) is an attack where the attacker secretly relays and possibly alters the communication between two parties who believe they are directly communicating with each other. One example is active eavesdropping, in which the attacker makes independent connections with the victims and relays messages between them to make them believe they are talking directly to each other over a private connection, when in fact the entire conversation is controlled by the attacker. The attacker must be able to intercept all relevant messages passing between the two victims and inject new ones. This is straightforward in many circumstances; for example, an attacker within reception range of an unencrypted Wi-Fi wireless access point, can insert himself as a man-in-the-middle.

As an attack that aims at circumventing mutual authentication, or lack thereof, a man-in-the-middle attack can succeed only when the attacker can impersonate each endpoint to their satisfaction as expected from the legitimate other end. Most cryptographic protocols include some form of endpoint authentication specifically to prevent MITM attacks. For example, TLS can authenticate one or both parties using a mutually trusted certification authority.

example:

Suppose Alice wishes to communicate with Bob. Meanwhile, Mallory wishes to intercept the conversation to eavesdrop and possibly (although this step is unnecessary) deliver a false message to Bob.

First, Alice asks Bob for his public key. If Bob sends his public key to Alice, but Mallory is able to intercept it, a man-in-the-middle attack can begin. Mallory sends a forged message to Alice that claims to be from Bob, but instead includes Mallory's public key.

Alice, believing this public key to be Bob's, encrypts her message with Mallory's key and sends the enciphered message back to Bob. Mallory again intercepts, deciphers the message using her private key, possibly alters it if she wants, and re-enciphers it using the public key Bob originally sent to Alice. When Bob receives the newly enciphered message, he believes it came from Alice.

http://en.wikipedia.org

Health Benefits of Raw Organic Sheep's Milk

Sheep milk is not as popular as cow milk in the United States, but sheep milk and its products are widely consumed in other parts of the world, especially in the Mediterranean. In fact, Greek feta cheese and Italian ricotta cheese are made from sheep milk. Sheep milk is rich in many nutrients, but it is not recommended that you drink it raw. The U.S. Food and Drug Administration or FDA states that drinking raw milk is a health risk because it can contain bacteria such as E. coli. The FDA also assures that pasteurization does not degrade the milk’s nutritional quality in any way.

Protein and Carbohydrate

Sheep milk is richer in protein than either cow or goat milk -- it contains about two percent more. You will find 14.7 grams of protein, or 29 percent of the recommended daily intake, in a 1-cup serving of sheep milk. Protein from mammalian milk is of high quality because it contains all essential amino acids. Getting enough protein is important because your body needs it to grow and repair itself. Sheep milk is also higher in lactose than cow and goat milk and is therefore not recommended for lactose-intolerant individuals.

http://www.livestrong.com