Serial Code Keys Hot 12
All mobile devices have a unique identity that is made up of an IMEI number, serial number and model number. The IMEI (or MEID) and serial number are two forms of identification for your phone or tablet. Just like fingerprints for people, these two numbers are different for every phone and tablet. These identifiers help ensure that your device is not a counterfeit and can also help you find it if it is lost or stolen. Additionally, sometimes you may need the IMEI or serial number to redeem special promotions from Samsung.
serial code keys hot 12
A serial number and IMEI are similar, but have some differences. The serial number is a unique number assigned by the manufacturer (like Samsung) to help identify an individual device, like a phone, tablet, TV, and so on. For example, your phone's serial number will be different from every other phone Samsung has made. Serial numbers make it easier for the makers to organize and keep track of their products.
On the other hand, an IMEI or MEID is only used for phones or other communication devices. Depending on the carrier, your device will have either an IMEI or MEID. These two numbers are different from a serial number. They are used at an international or global level, not just by manufacturers. Both types of numbers can help network providers track down a device that has been stolen or lost.
An Apple Lightning to USB cable has "Designed by Apple in California" and either "Assembled in China," "Assembled in Vietnam," or "Indústria Brasileira" on the cable about seven inches from the USB connector. You'll see a 12-digit serial number at the end of this text.
The label is arbitrary. It is suggested that you put the fkey name (F1, F2, etc.) and a very brief description in the label, because this makes the button labels in the EW act as visible documentation for the fkeys even if you never use the mouse. However, putting F3 in a label DOES NOT automatically mean that this message will go into F3.
The association between lines in the mc file and the function keys is strictly positional. The first non-comment line (starting with any character other than #) is the F1 message regardless of what the label says. The second line is the F2 message. And so on.
There are up to 24 active lines in a file. The first 12 are for Run mode, the second 12 are for S&P. If there are fewer than 12 active lines, function keys after the last one will be empty, and S&P keys will be identical to Run. If there are exactly 12 active lines, S&P will be identical to Run. If there are between 12 and 24 active lines, the S&P lines after the last one will be identical to their Run counterparts. So for example, if there are 15 active lines, the first 12 are Run F1-F12. The next 3 are S&P F1-F3, and S&P F4-F12 will be identical to Run F4-F12.
The way the keys below are designed, they will work in many RTTY contests without any changes. Whether these particular ones suit your situation will depend on your antennas, your power, QTH, etc.; but maybe these will give you some ideas to work with:
When using the above keys it is assumed that ESM is on. The Run mode keys F5, F6 and F7 are not very useful when you are S&Ping, this is why I put those keys to better use by programming them differently from the Run mode keys.Note also that you can use up to 24 additional buttons (mouse only, no keyboard access) on the digital interface window. For example, you can set up 0x1, 0x2, 0x3 and 0x4 calls, single, double and triple exchanges, separate requests for his zone and state and repeats for your zone only and for your state only, and so on.
In phone contests it is not necessary to use this option simply to change the voice in recorded messages (see the description of the OPERATOR macro in the next section on SSB function key messages instead). However, by using individual per-operator function key files, it is possible for one operator to use a function key message file that includes ! and # macros for voicing of call signs and serial numbers using pre-recorded letters and numbers, while another operator can use a function key message file that does not include these macros, and speak call signs and serial numbers into the microphone. In CW and digital modes, by using this option different operators can tailor their function key messages to match their individual preferences.
The option of voicing call signs, serial numbers and frequencies character-by-character appears to be growing in popularity among SSB contesters. One operator, to protect the sleep of his wife and young children, even created such a complete set of voicing files that he could operate an entire Sweepstakes without a microphone.
When you try to voice a number for the first time after program start, the program checks to see whether all the needed files for advanced voicing are present. The outcome of the check is displayed in the bottom section of the Info window, so be sure to open it. If one or more are missing, serial numbers will be voiced using the simple voicing method. The same check is also made with changing operators (with Ctrl+O).
EXCH Sent ExchangeEXCH Sent Exchange, based on the contents of the Sent Exchange box in the Contest Setup dialog. When the sent exchange includes a serial number (001 in the Sent Exchange box), the number sent will be for the current QSO if there is a call sign in the entry window, or for the previous QSO if there is no call sign in the entry window.
License keys are the defacto-standard as an anti-piracy measure. To be honest, this strikes me as (in)Security Through Obscurity, although I really have no idea how license keys are generated. What is a good (secure) example of license key generation? What cryptographic primitive (if any) are they using? Is it a message digest? If so, what data would they be hashing? What methods do developers employ to make it difficult for crackers to build their own key generators? How are key generators made?
For old-school CD keys, it was just a matter of making up an algorithm for which CD keys (which could be any string) are easy to generate and easy to verify, but the ratio of valid-CD-keys to invalid-CD-keys is so small that randomly guessing CD keys is unlikely to get you a valid one.
When I originally wrote this answer it was under an assumption that the question was regarding 'offline' validation of licence keys. Most of the other answers address online verification, which is significantly easier to handle (most of the logic can be done server side).
With offline verification the most difficult thing is ensuring that you can generate a huge number of unique licence keys, and still maintain a strong algorithm that isnt easily compromised (such as a simple check digit)
It is however very much security by obscurity. Anyone taking the time to disassemble the code would be able to find the graphing function and encryption keys, then mock up a key generator, but its probably quite useful for slowing down casual piracy.
Require that the number be divisible by (say) 17. Trivial to guess, if you have access to many keys, but the majority of potential strings will be invalid. Similar would be requiring that the checksum of the key match a known value.
Require that the first half of the key, when concatenated with a known value, hashes down to the second half of the key. Better, but the program still contains all the information needed to generate keys as well as to validate them.
Generate keys by encrypting (with a private key) a known value + nonce. This can be verified by decrypting using the corresponding public key and verifying the known value. The program now has enough information to verify the key without being able to generate keys.
One solution that should give you these would be to use a public key signing scheme. Start with a "system hash" (say grab the macs on any NICs, sorted, and the CPU-ID info, plus some other stuff, concatenate it all together and take an MD5 of the result (you really don't want to be handling personally identifiable information if you don't have to)) append the CD's serial number and refuse to boot unless some registry key (or some datafile) has a valid signature for the blob. The user activates the program by shipping the blob to you and you ship back the signature.
Potential issues include that you are offering to sign practically anything so you need to assume someone will run a chosen plain text and/or chosen ciphertext attacks. That can be mitigated by checking the serial number provided and refusing to handle request from invalid ones as well as refusing to handle more than a given number of queries from a given s/n in an interval (say 2 per year)
The only major down side is that your CD keys will be quite long when using private / public keys 1024-bit in size. You also need to choose a nonce long enough so you aren't encrypting a trivial amount of information.
A good software license key/serial number generator consists of more than just a string of random characters or a value from some curve generator. Using a limited alphanumeric alphabet, data can be embedded into a short string (e.g. XXXX-XXXX-XXXX-XXXX) that includes all kinds of useful information such as:
The license key data is then encrypted and then encoded using the limited alphanumeric alphabet. For online validation, the license server holds the secrets for decrypting the information. For offline validation, the decryption secret(s) are included with the software itself along with the decryption/validation code. Obviously, offline validation means the software isn't secure against someone making a keygen.
Probably the hardest part about creating a license key is figuring out how to cram as much data as possible into as few bytes as possible. Remember that users will be entering in their license keys by hand, so every bit counts and users don't want to type extremely long, complex strings in. 16 to 25 character license keys are the most common and balance how much data can be placed into a key vs. user tolerance for entering the key to unlock the software. Slicing up bytes into chunks of bits allows for more information to be included but does increase code complexity of both the generator and validator.