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    • How to Determine if a Credit Card Number is Valid

      How to Determine if a Credit Card Number is Valid

      Credit cards use the Luhn Check Digit Algorithm. The main purpose of the Luhn Check Digit Algorithm is to catch data entry errors, but it does double duty here as a weak security tool. The Luhn Check Digit Algorithm For a card with an even number of digits, double every odd numbered digit (1st digit,

    • Substitution and Transposition Ciphers

      Substitution and Transposition Ciphers

      Substitution and transposition ciphers are two categories of ciphers used in classical cryptography. Substitution and transposition differ in how chunks of the message are handled by the encryption process. Substitution ciphers Substitution ciphers encrypt plaintext by changing the plaintext one piece at a time. The Caesar Cipher was an early substitution cipher. In the Caesar

    • How Do I Get Rid of About Blank?

      How Do I Get Rid of About Blank?

      About: Blank is a homepage hijacker that severely slows down your computer and shows popup advertisements randomly while using one’s Internet browser. While it does not do actual damage to the computer, it does limit what can be done on the computer because, at times, the About: Blank could be using as high as 80%

    • How to Change a Yahoo Password

      How to Change a Yahoo Password

      To change a Yahoo Password, visit Yahoo: Change Password. Changing a Yahoo password causes all the passwords on Yahoo’s personalized services to change. These personalized services include: Yahoo! Mail Yahoo! Messenger Yahoo! Chat My Yahoo! Yahoo! Finance The instructions to change a Yahoo password will only work if the user knows his/her current Yahoo password.

    • AES (Rijndael)

      AES (Rijndael)

      AES (Advanced Encryption Standard) is the currently employed specification for encrypting electronic data by the United States National Institute of Standards and Technology, or NIST. AES was selected as the U.S. standard for encryption of unclassified information in 2001 supplanting DES which had been the U.S. standards for a number of years (since 1977). AES

    • How to Delete Recent Searches

      How to Delete Recent Searches

      Deleting recent searches–be they from Bing, Google or Yahoo–is an easy thing to do. While the steps vary a little from Internet Explorer to FireFox, for the most part, they take the same amount of time and can be found in the same place. Deleting Recent Searches in Internet Explorer Click on the tools button.

    • Sonicwall Default Password

      Sonicwall Default Password

      Sonicwall is a company that produces routers, modems, VPN (Virtual Private Network) hardware, and firewall solutions for both personal and commercial users. Sonicwall routers, in particular, are widely distributed to an array of consumers who access the Internet through high speed secure connections due to the support that Sonicwall products provide. Sonicwall routers generally consist

    • How to Recover a Zip Password

      How to Recover a Zip Password

      PKZip utilizes a proprietary stream cipher that is vulnerable to a known plaintext attack, as Eli Biham and Paul C. Kocher describes in A Known Plaintext Attack on the PKZIP Stream Cipher. In ZIP Attacks with Reduced Known-Plaintext, Michael Stay describes an improved known plaintext attack that works against files that non-PKZip zip programs such

    • g2mdlhlpx.exe

      g2mdlhlpx.exe

      The original g2mdlhlpx.exe is a part of Citrix GoToMeeting and GoToWebinar. Malware creators have copied this filename in an attempt to “hide” from PC owners and system administrators. Someone who has Citrix GoToMeeting or GoToWebinar installed does not have to worry about this process. However, if he/she does not have either of these Citrix products

    • ISO 7816

      ISO 7816

      ISO 7816 is the internationally accepted standard for smart cards. ISO 7816 is a family of standards primarily dealing with aspects of smart card interoperability regarding communication characteristics, physical properties, and application identifiers of the implanted chip and data. The ISO 7816 family includes eleven parts which are in a constant state of flux as

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