2022 Australian Signals Directorate 50 cent
In August 2022 the Royal Australian Mint launched a non-circulating commemorative 50c piece commemorating 75 years of the Australian Signals Directorate, with sales beginning in September (https://www.ramint.gov.au/publications/coded-coin-signals-asds-75th-anniversary). The coin's design came with a twist: a secret message was encoded in the coin's design.
The message is not straight-forward to decode: the first hint is on the obverse, with the letters B, T, H, A, S and A in the legend ELIZABETH II AUSTRALIA 2022 each having Braille markings under them. The Braille markings are numbers which give the order to put the letters in, which gives Atbash. Decoding the outside bottom on the reverse (URMWXOZIRGBRM7DRWGSC5WVKGS) with Atbash gives "FIND CLARITY IN 7 WIDTH X 5 DEPTH" and decoding the outside top on the reverse (DVZIVZFWZXRLFHRMXLMXVKGZMWNVGRXFOLFHRMVCVXFGRLM) with Atbash gives "WE ARE AUDACIOUS IN CONCEPT AND METICULOUS IN EXECUTION". The inside text on the reverse (BGOAMVOEIATSIRLNGTTNEOGRERGXNTEAIFCECAIEOALEKFNR5LWEFCHDEEAEEE7NMDRXX5) can be done by arranging the letters into 7x5 grids and reading the columns: it becomes "BELONGING TO A GREAT TEAM STRIVING FOR EXCELLENCE WE MAKE A DIFFERENCE XOR HEX A5D75".
The next answer involves the hexadecimal text on the reverse (E3B8287D4290F7233814D7A47A291DC0F71B2806D1A53B311CC4B97A0E1CC2B93B31068593332F10C6A3352F14D1B27A3514D6F7382F1AD0B0322955D1B83D3801CDB2287D05C0B82A311085A033291D85A3323855D6BC333119D6FB7A3C11C4A72E3C17CCBB33290C85B6343955CCBA3B3A1CCBB62E341ACBF72E3255CAA73F2F14D1B27A341B85A3323855D6BB333055C4A53F3C55C7B22E2A10C0B97A291DC0F73E3413C3BE392819D1F73B331185A3323855CCBA2A3206D6BE3831108B). Using xor with the key A5D75A5D75 gives "FOR 75 YEARS THE AUSTRALIAN SIGNALS DIRECTORATE HAS BROUGHT TOGETHER PEOPLE WITH THE SKILLS, ADAPTABILITY AND IMAGINATION TO OPERATE IN THE SLIM AREA BETWEEN THE DIFFICULT AND THE IMPOSSIBLE."
The final answers involve the hexadecimal text on the reverse: the shading of the characters of the inner ring is binary and the shading of the characters of the outer ring is Morse code. The text of the inner ring is "ASDCbr2022" and the text of the outer ring is "1947 DSB Albert Park".