The fourteen-year-old breaks the Australian currency code

The fourteen-year-old breaks the Australian currency code

The fourteen-year-old breaks the Australian currency code

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L’Direction of Australian signals (ASD), the Australian intelligence service, has just celebrated its 75th anniversary. To celebrate the event, the organization designed a commemorative coin of 50 cents, in a limited edition of 50,000 copies. The piece, which went on sale on 1uh September, contains several messages with four advertised levels of encryption.

The code, written on both sides, is a recruiting techniques for the intelligence service. ” We thought it was a really fun way to inspire people to destroy codes in the hope that if they can clear the four levels of coding on the piece, they can apply for a job at the Australian Signals Directorate “, Said Rachel Noble, director general of the ASD.

A code solved very quickly

It’s done. Once the coins went on sale, a 14-year-old boy from Tasmania deciphered the message in just over an hour. The ASD put together a form for those who could completely decipher the message, and the teen was the first to send him his response. Rachel Noble said the agency hopes to meet him soon to recruit him, but there is a fifth encryption level that the teenager had not discovered.

However, others have solved the puzzles long ago. Available online from August 20, the content had to be published in a legal text before the piece could go on sale. Some have spotted it and posted it on the forums. However, it was impossible decipher the latest code without having the piece in hand (or high definition images).

Solutions at the five levels of code

The first code is on the front, with numbers in braille under the text Elizabeth II – Australia. By reading the letters in the order indicated, we get the message Atbashthe name of a substitution cipher, where A is replaced by Z, B by Y, and so on.

The tail side contains two lines of text around the edge. By applying the Atbash to the outer circle, you get the message ” We are bold in concept and meticulous in execution. Find clarity in 7 widths x 5 depths or, translated into French, ” We are bold in concept and meticulous in execution. Find clarity in 7 widths x 5 deep “.

Following the direction in the second part of the post, the next step is to arrange the letters in the inner circle in 7 by 5 grids starting with BGOAMVO, creating two grids in total. A vertical reading of the letters organized in this way gives ” By belonging to a great team in pursuit of excellence, we make the difference XOR HEX A5D75 “, or in French” By belonging to a great team that strives for excellence, we can make a difference XOR HEX A5D75 “.

The message indicates that the next party is using the cryptography XOR. It applies to the characters of the middle part, which are in hexadecimal, by doubling the given key to get A5D75A5D75. This part can be done with a simple website, such as The resulting text, translated into French, gives ” For 75 years, the Australian Signals Directorate has brought together people with the skills, adaptability and imagination to operate on the fine line between the difficult and the impossible.. “.

Finally, the last cryptography lies in a distinction physicist imperceptible. Some letters on the two lines around the edge have a different finish. The outer circle is in the code Walrus and from” 1947 DSB Albert Park », The year the agency was founded, the initial name and place. The inner circle is tracks and from” ASD CBR 2022 (CBR for Canberra, current headquarters of the ASD).

If you’ve followed it all, you can now apply for the ASD!

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