B affled Twitter users were left stumped after the Queen revealed a plaque commemorating the centenary of GCHQ containing two hidden codes. Despite the spy agency giving out clues to deciphering the codes, many were still baffled by the secret messages. The Queen unveiled the plaque on a tour of the intelligence agency’s first base, which was opened at Watergate House, near Charing Cross, a century ago. The hidden messages were included as a tribute to the code-breakers who founded the agency and the abilities of those who work for it today. Jeremy Fleming, Director GCHQ with Queen Elizabeth II after she unveiled a plaque during a visit to Watergate House in London to mark the centenary of GCHQ / PA Guesses included the symbols underneath several letters spelling out "hundred years," or the four underlined letters spelling "dees". Boffins also suggested that "secret" could be spelled out in morse code using the method of highlighting. The correct answers will be revealed on the GCHQ Instagram account tomorrow. Despite their best efforts, many Twitter users were unable to crack either of the codes, with some managing one. Richard Lindsay said: “I only got one, I’d be a rubbish spy.” Fred Nurk added: “No idea. Perhaps that's why, despite my sitting endlessly in Pret Vauxhall gazing out at Vauxhall Cross, I have never once been given a cryptic crossword to solve.” While Megan Robertson joked: “If I reveal them someone will probably shoot me.” The Royal Family also posted a puzzle on their Twitter account, with a scrambled cypher code of letters. By working out that “100GS” was “100th”, brainy followers were able to crack the code and reveal that the message spelt “Hello GCHQ it was great to be part of your 100th celebrations thank you for having us.” During her visit, the Queen also met Ruth Bourne, who worked as a bombe encryption device operator at Bletchley Park during the Second World War.<doc-sep>The Queen has unveiled a new plaque to mark the centenary of GCHQ - which fittingly contains a hidden message that spies are asking the public to try and crack. Her Majesty, 92, chose a royal blue coat and a matching hat adorned with a green feathered sprig as she arrived at Watergate House in Charing Cross, where the UK's Intelligence, Security and Cyber Agency first started. On the steps outside the building, she pulled back a pair of ochre velvet curtains to reveal the green plaque, complete with its hidden message. Her Majesty, 92, chose a royal blue coat and a matching hat adorned with a green feather and gold sprig as she arrived at Watergate House in Charing Cross, central London The plaque unveiled by the Queen today at GCHQ's original headquarters in Charing Cross. It contains a coded messages which spies are challenging the public to crack The brand-new plaque offers a history of GCHQ, which was formed from previous security organisations including The Admiralty's Room 40 and The War Office's M11 Afterwards, the Queen responded by releasing her own coded note on Twitter for the spies to decipher. They promptly did and released their own coded reply. All the messages are below with the solutions at the bottom of this article. The Queen has been receiving intelligence from the agency for much of its existence - but she joked how her father King George VI would become frustrated with his scrambler phone, modified by GCHQ to make his calls secret. Afterwards, the Queen responded by releasing her own coded message on Twitter for the spies to decipher They promptly did and released their own secret reply - which is pictured above GCHQ's director Jeremy Fleming, speaking at the agency's former London home, told the Queen and invited guests: 'Our work is not often glamorous or easily portrayed in film. 'But over the last 100 years it has saved countless lives, shortened wars, given Britain an edge, and solved or harnessed some of the world's hardest technology challenges.' Among the guests for the Queen's unannounced visit were Alex Younger, chief of the Secret Intelligence Service (MI6) and known as 'C', and Andrew Parker, director general of MI5, the Secret Service. Mr Fleming added: 'It's clear to us all that the world is changing at an unprecedented rate. It's more interconnected than ever before. 'And this is driving extraordinary opportunity, innovation and progress. It's also unleashing amazing complexity, uncertainty and risk. 'To keep up in this digital era - to optimise the potential of technologies like artificial intelligence and quantum computing - we know we need to keep reinventing.' GCHQ now has its headquarters in Cheltenham. Pulling back the ochre velvet curtains, the Queen reveals the green plaque at Watergate House, which lies close to Charing Cross Station in Central London After being presented with a bunch of spring flowers including miniature daffodils, the Queen chats with Jeremy Fleming, Director of the GCHQ, as she prepares to unveil the plaque A colourful sprig adorns the royal blue hat of the Queen, 92, as she arrives at Watergate House in London this morning to unveil a plaque commemorating the centenary of the UK's Intelligence, Security and Cyber Agency Ahead of the unveiling, GCHQ Director Jeremy Fleming told crowds the security services in the UK had a history of solving or harnessing 'some of the world's hardest technology challenges' The Queen listened to Jeremy Fleming as he said: 'Our work is not often glamorous or easily portrayed in film' Japes: The Queen shares a joke with the head of MI6 Alex Younger as GCHQ Director Jeremy Fleming (far left) looks on The Queen met Ruth Bourne, 92, a former Bletchley Park code breaker. When the subject of scrambler phones - used to keep important conversations confidential - was mentioned, the Queen said: "I remember my father had one, he used to get so cross when it didn't scramble. 'Took some time to heat up and then work. The machines used valves, today replaced by transistors, which needed time to warm up before the equipment would work.' The head of GCHQ said his agency has 'saved countless lives' and 'shortened wars' as the Queen celebrated the 100th anniversary of the intelligence, security and cyber organisation. The Queen looked relaxed during the visit. She completed her bright blue ensemble with her favoured black loafers, black leather handbag and a pair of black woollen gloves. A stunning brooch and three-tier string of pearls added a hint of regal glamour. Earlier today, it was announced that the Duke of Edinburgh will not face prosecution for the car accident he was involved in close to the Sandringham Estate in January. Close security: The Queen walks past a protection officer as she begins a tour of the building The Queen wears an elaborate adornment incorporating green feathers on her royal blue hat The Queen heard about modern advances in security including artificial intelligence and quantum computing The Queen has regularly received intelligence from the agency throughout her life and joked about the 'scrambler' phone her father, King George VI, had to use She told Jeremy Fleming: 'I remember my father had one, he used to get so cross when it didn't scramble' Accessorising with a pair of black gloves and her trusty black leather handbag, the Queen chatted about the organisation's role in British security with Jeremy Fleming, GCHQ Director<doc-sep>THE Queen unveiled a new GCHQ plaque today containing secret message to mark the agency's 100 year anniversary. The 92-year-old monarch was in good spirits for the visit, even joking about how her father King George VI would get frustrated with his scrambler installed by the communication headquarters. 7 The Queen grins as she unveils the plaque today to mark the GCHQ's 100 year anniversary Credit: PA:Press Association 7 The plaque has a secret message for the organisation, whose original name was the Government Code and Cypher School Credit: PA:Press Association Her Majesty, who has received information from the agency for much of its existence, congratulated the agency for its work saving countless lives since it was launched in 1919. Speaking to former Bletchley Park code breaker, 92-year-old Ruth Bourne, the Queen revealed her own experiences with scrambler phones used to keep conversations confidential. She said: "I remember my father had one, he used to get so cross when it didn't scramble. "Took some time to heat up and then work." The Queen wore an eye-catching blue coat and matching hat for the visit to the intelligence agency's former home near London's King Cross. And she unveiled the plague for the organisation, whose original name was the Government Code and Cypher School. The sign uses dots and dashes under particular letters to create a special code - spelling out "1 Hundred Years". TOP SECRET Codes were also revealed during the Queen's visit - with Princess Elizabeth referred to as '2519' and Princess Margaret '6101' in codes om 1939. Queen Elizabeth II also met with Alex Younger, chief of the Secret Intelligence Service (MI6) and known as "C", and Andrew Parker, director general of MI5, the Secret Service. Mr Fleming discussed the changing world, saying it was evolving at an "unprecedented" rate. He said: "This is driving extraordinary opportunity, innovation and progress. It's also unleashing amazing complexity, uncertainty and risk. "To keep up in this digital era - to optimise the potential of technologies like artificial intelligence and quantum computing - we know we need to keep reinventing." MOST READ IN NEWS 'GOBSMACKED' Queen 'gave Harry OK for Oprah series after misleading pitch about soldiers' ROD LIDDLE Ousting right-on National Trust boss is a victory against wokery DRUMMER DEAD School Of Rock star dies at 32 after being hit by car as Jack Black mourns HOUSE ABOUT IT You won't believe what this ordinary London home looks like on the inside Exclusive TOM'S LEGACY Captain Tom Moore — who raised £39m for charity — left family £73k in will JABS HOPE Scientists 'crack cause of blood clots linked to Covid jabs & know how to fix it' It's been a busy day for the Royal Family, with Prince Harry heading to Norway to visit troops undergoing extreme weather training. And the Duke of Sussex couldn't help but smile as he spotted a photograph of his wedding to Meghan Markle - having to leave her at home for Valentine's Day for today's royal engagement. Back in 2015, the former Suits actress wrote on her lifestyle blog The Tig: "Hook, line and sinker, I am such a sucker for Valentine's Day." Kate Middleton makes pizzas and bird boxes with young students - and reveals George and Charlotte love being outside 7 The 92-year-old talked about her father using a scrambler Credit: AFP or licensors 7 The monarch seemed in good spirits for the visit Credit: Reuters 7 The Queen is shown in the 1993 Royal Codebook with her family Credit: Twitter 7 Princess Elizabeth was referred to as '2519' and Princess Margaret '6101' in codes Credit: Twitter 7 The Queen met with Bletchley Park veteran Ruth Bourne Credit: Reuters We pay for your stories! Do you have a story for The Sun Online news team? Email us at tips@the-sun.co.uk or call 0207 782 4368. 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The Queen unveiled a plaque containing a secret message to celebrate the 100th anniversary of GCHQ. The UK's intelligence agency has "saved countless lives" and "shortened wars" since it was launched in 1919, under the original name of the Government Code and Cypher School. The Queen, who has been receiving information from the organisation for much of it's existence, met with a number of senior figures at the agency's former home near London's King Cross. During her visit she joked about how her father King George VI would become frustrated with his scrambler phone, modified by GCHQ to make his calls secret. She also unveiled a plaque marking the anniversary, which contains a secret message. Can you crack the code? (Image: Getty Images) People have taken to social media to try and work out what it says. Here's a hint - look at the dots and dashes under some of the letters. The letters with dots spell out '1 Hundred Years', a nod to the special occasion. During her visit she met Alex Younger, chief of the Secret Intelligence Service (MI6) and known as "C", and Andrew Parker, director general of MI5, the Secret Service. Mr Fleming added: "It's clear to us all that the world is changing at an unprecedented rate. It's more interconnected than ever before. (Image: Getty Images) "And this is driving extraordinary opportunity, innovation and progress. It's also unleashing amazing complexity, uncertainty and risk. "To keep up in this digital era - to optimise the potential of technologies like artificial intelligence and quantum computing - we know we need to keep reinventing." (Image: AFP/Getty Images) During her visit to the nondescript office block near Charing Cross station, the Queen met Ruth Bourne, 92, a former Bletchley Park code breaker. When the subject of scrambler phones - used to keep important conversations confidential - was mentioned, the Queen said: "I remember my father had one, he used to get so cross when it didn't scramble. "Took some time to heat up and then work." The machines used valves, today replaced by transistors, which needed time to warm up before the equipment would work.