Search Search WWW Search DelphiForFun.org As of October, 2016, Embarcadero is offering a free release of Delphi ( ). There are a few restrictions, but it is a welcome step toward making more programmers aware of the joys of Delphi.

They do say 'Offer may be withdrawn at any time', so don't delay if you want to check it out. Please use the to let me know if the link stops working.

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Support DFF - Shop If you shop at Amazon anyway, consider using this link. We receive a few cents from each purchase. Thanks Support DFF - Donate If you benefit from the website, in terms of knowledge, entertainment value, or something otherwise useful, consider making a donation via PayPal to help defray the costs. (No PayPal account necessary to donate via credit card.) Transaction is secure. Metronomy the english riviera 320 rare. Mensa Daily Puzzlers For over 15 years Mensa Page-A-Day calendars have provided several puzzles a year for my programming pleasure. Coding 'solvers' is most fun, but many programs also allow user solving, convenient for 'fill in the blanks' type. Below are Amazon links to the two most recent years.

(Hint: If you can wait, current year calendars are usually on sale in January.) Contact: Send an e-mail with your comments about this program (or anything else). Search DelphiForFun.org only Problem Description Here's a 'proof of concept' demo program implementing my ideas far an algorithm to generate program license keys when a product is purchased. The is then that can be used by the program when the program is activated or run The algorithm used here is original with me and, as far as I know, will NOT generate keys for any existing commercial programs! Background & Techniques Overview A user recently requested a model to create a license to include purchaser's name, licensing date, and license period. Here's first cut at a method to accomplish this. I have generalized the technique by including a field definition table which provides field names, lengths, and whether the field is fixed or variable length.

License keys consist of upper case letters and numbers separated by hyphen '-' characters into a fixed number of fixed size segments. Below is a screen shot of sample key definition input parameters and encryption key generation (left side) and test controls for building and decoding License Keys for a specific license (right side). Note that generated keys are restricted to uppercase letters and digits 0 to 9. This seems to be the case in professionally generated keys I have observed.

If all of these 36 symbols are to be allowed in the input fields, then special characters cannot be encoded. I can think of ways around this at the expense of key length, (See 'Suggestions' section below). Variable length fields are padded with random characters to reach the maximum length. Fields longer than the specified length are truncated. If the size of the defined data (field length sum + variable field count) is less than the desired license key length (segment size X # of segments) then consider adding additional 'dummy' unused fields or expanding fixed fields by making them larger variable length fields. Encryption Key and License Key Generation The encryption algorithm is a simple substitution process. The 36 allowed character are randomly shuffled to generate the encryption key.

The License Key generation process finds the position of each input character in the Master Key and replaces it with the character from the same position in the Encryption Key. For variable length fields, the initial character represents the number of characters required to pad the field to its specified maximum length ('A'=0, 'B'-1, etc.). Than number of random characters is then added to the License Key before the encrypted field data is appended. A hyphen character is inserted every 'SegSize' characters in the displayed key for ease of user entry. License Key Decryption In the application registration processing, the License key from the user is decoded to recreate the original data fields. These can be used to validate the license conditions and approve or deny access to the application itself.