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[EN VIDÉO] Kézako: How is data encrypted on the Internet? Cryptography is the oldest form of encryption. Traces of its use remain until the year 2000 BC This technique, which is still used today, especially on the Web, reveals its mysteries in video thanks to the Kézako program of Unisciel and the University of Lille 1. Australian Signals Directorate (ASD), the Australian intelligence service, has just celebrated its 75th anniversary. To celebrate the event, the organization designed a commemorative 50-cent coin, in a limited edition of 50,000 copies. The coin, which went on sale on September 1, contains several messages with four announced levels of encryption. The code, written on both sides, is a recruiting technique for the intelligence service. “We thought this was a really fun way to get people cracking the codes in the hope that if they can get past the four levels of coding in the piece, they might apply to work at the Australian Signals Directorate “. said Rachel Noble, CEO of the ASD. Once the coins went on sale, a 14-year-old boy from Tasmania deciphered the message in just over an hour. ASD created a form for those who could fully decipher the message, and the teenager was the first to submit his response. Rachel Noble said the agency hopes to meet with him soon to recruit him, but there is a fifth level of encryption that the teenager has not discovered, but others have solved the riddles long before. Before the coin could be put up for sale, its contents had to be published in a legal text, available online from 20 August. Some spotted it and posted it on the forums. However, it was impossible to decipher the latest code without having the coin in hand (or high definition images). Reading the letters in the given order yields the message Atbash, the name of a substitution cipher, where A is replaced by Z, B by Y, etc. The tail side contains two lines of text around from the edge By applying the Atbash to the outer circle, we get the message “We are bold in concept and meticulous in execution. Find clarity in 7 wide x 5 deep” or, translated into French, “We are bold in concept and meticulous in the execution Find clarity in 7 wide x 5 deep.” Following the lead from the second part of the post, the next step is to arrange the letters in the inner circle into 7 by 5 grids starting with BGOAMVO, which are two grids in total. A vertical reading of the cards arranged in this way gives “Belonging to a great team that aspires to excellence let’s make a difference XOR HEX A5D75”, or in French “Belonging to a great team that aspires to the excellency, we can change things XOR HEX A5D75”. The message indicates that the following part is using XOR encryption. It should be applied to the characters in 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 www .dcode.fr. The resulting text, translated into French, reads: “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 cipher is in a subtle physical distinction. Some letters in the two lines around the edge have a different finish. The outer circle is in Morse code and gives “1947 DSB Albert Park”, the year of foundation of the agency, its initial name and location. The inner circle is in binary and says “ASD CBR 2022” (CBR for Canberra, ASD’s current headquarters). If you’ve followed everything, now you can apply for ASD!Interested in what you just read?
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