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  2. Hadamard code - Wikipedia

    en.wikipedia.org/wiki/Hadamard_code

    The Hadamard code is a linear code, and all linear codes can be generated by a generator matrix.This is a matrix such that () = holds for all {,}, where the message is viewed as a row vector and the vector-matrix product is understood in the vector space over the finite field.

  3. MscGen - Wikipedia

    en.wikipedia.org/wiki/Mscgen

    Mscgen (short for MSC generator) is a software tool for drawing message sequence charts [1] from a simple to manage text-based source file. Rendered charts can be output in PNG, SVG and PostScript, with hyperlink information in ismap format.

  4. QR code - Wikipedia

    en.wikipedia.org/wiki/QR_Code

    The QR code system was invented in 1994, at the Denso Wave automotive products company, in Japan. [6] [7] [8] The initial alternating-square design presented by the team of researchers, headed by Masahiro Hara, was influenced by the black counters and the white counters played on a Go board; [9] the pattern of the position detection markers was determined by finding the least-used sequence of ...

  5. Tap code - Wikipedia

    en.wikipedia.org/wiki/Tap_code

    The tap code, sometimes called the knock code, is a way to encode text messages on a letter-by-letter basis in a very simple way. The message is transmitted using a series of tap sounds, hence its name. [1] The tap code has been commonly used by prisoners to communicate with each other.

  6. Numbers station - Wikipedia

    en.wikipedia.org/wiki/Numbers_station

    The FBI testified that they had entered a spy's apartment in 1995, and copied the computer decryption program for the Atención numbers code. They used it to decode Atención spy messages, which the prosecutors unveiled in court. [19] The United States government's evidence included the following three examples of decoded Atención messages. [19]

  7. Compose and send emails in AOL Mail

    help.aol.com/articles/aol-mail-compose-and-contacts

    1. Open an email message. 2. On the top of the message, click the Reply icon (reply to 1 sender), or the Reply All icon (reply to everyone on the email thread). 3. Type your response.

  8. One-time pad - Wikipedia

    en.wikipedia.org/wiki/One-time_pad

    In 1945, the US discovered that Canberra–Moscow messages were being encrypted first using a code-book and then using a one-time pad. However, the one-time pad used was the same one used by Moscow for Washington, D.C. –Moscow messages.

  9. AOL Mail

    mail.aol.com/?icid=aol.com-nav

    Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!