Post: #1
హల్లో ఫ్రెండ్స్!
నాకు నా సిస్టం మెషీన్ కోడ్(mac) తెలుసుకోవాలని ఉంది. అది ఎలాగో తెలియచేయగలరు.

Post: #2
Identifying your MAC address is easy. In most cases, it is physically printed on the adapter itself. On a laptop with a PC Card-based adapter, it's easy to see. Just disconnect the card and flip it over. On a PC or a laptop with an integrated network adapter, you need to find it using software. The process is almost identical to the utility you use to see your systems IP address. On a Windows 2000 or Windows XP machine you would use IPCONFIG. To see the MAC address, you need to add /ALL to the command. For those not familiar with it the sequence of steps is as follows:

Click on START, and then click on RUN.
The RUN dialogue box will appear. Type CMD and press ENTER.
A DOS window will appear. This is also commonly called a Command Prompt.
Now type IPCONFIG /ALL at the command prompt and hit ENTER. This window will now display the configuration of all of your network adapters. If you have multiple network adapters in your PC you'll see multiple addresses. The MAC Address you're looking for will be listed under the heading Ethernet adapter Wireless Network Connection.
Now look for the Physical Address. It should look something like 00-50-BA-D1-BA-71.
To close the window when you are finished, type exit at the command prompt and hit the Enter -.
Now that you have the MAC address in hand, just follow your router's documentation for setting up the MAC filter. By the way: Don't forget to change your router's default password. This is a common security hole that many people forget about. Good Luck!

Post: #3
nagul గారు,
మీరిచ్చ్జిన reply కి దన్యవాదములు, కాని మీరిచ్చిన రిప్లై చూసిన తర్వాత మరో అనుమానం కలిగింది.
అదేంటంటే, సిస్టం మెషీన్ కోడూ మరియు mac ఒకటేనా, దయచేసి తెలియచేయగలరు, దన్యవాదాలు.

Post: #4
A cryptographic message authentication code (MAC) is a short piece of information used to authenticate a message. A MAC algorithm accepts as input a secret - and an arbitrary-length message to be authenticated, and outputs a MAC (sometimes known as a tag). The MAC value protects both a message's integrity as well as its authenticity, by allowing verifiers (who also possess the secret -) to detect any changes to the message content. A message integrity code (MIC) is another name for a MAC that is usually used when the acronym "MAC" is defined to mean something else, like when it means Media Access Control in networking contexts.

While MAC functions are similar to cryptographic hash functions, they possess different security requirements. To be considered secure, a MAC function must resist existential forgery under chosen-plaintext attacks. This means that even if an attacker has access to an oracle which possesses the secret - and generates MACs for messages of the attacker's choosing, he can "never" guess the MAC for any message that he has not yet asked the oracle about. (Here "never" means, "not without doing an infeasible amount of computation").

MACs differ from digital signatures, as MAC values are both generated and verified using the same secret -. This implies that the sender and receiver of a message must agree on - before initiating communications, as is the case with symmetric encryption. For the same reason, MACs do not provide the property of non-repudiation offered by signatures: any user who can verify a MAC is also capable of generating MACs for other messages. In contrast, a digital signature is generated using the private - of a - pair, which is asymmetric encryption. Since this private - is only accessible to its holder, a digital signature proves that a document was signed by none other than that holder. Thus, digital signatures do offer non-repudiation.

MAC algorithms can be constructed from other cryptographic primitives, such as cryptographic hash functions (as in the case of HMAC) or from block cipher algorithms (OMAC, CBC-MAC and PMAC)
Machine code or machine language is a system of instructions and data executed directly by a computer's central processing unit. Machine code may be regarded as a primitive (and cumbersome) programming language or as the lowest-level representation of a compiled and/or assembled computer program. Programs in interpreted languages [1] are not represented by machine code however, although their interpreter (which may be seen as a processor executing the higher level program) often is. Machine code is sometimes called native code when referring to platform-dependent parts of language features or libraries.[2] Machine code should not be confused with so called "bytecode", which is executed by an interpreter.

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