The app is designed mainly to tempt youngsters between the ages of 14 and 16 into trying their hand in cryptography and code-breaking, but can be used by anyone interested in cryptography. According to GCHQ, Cryptoy app will help users to understand basic encryption methods, teach the codes of the past, and create their own encrypted messages.

The newly launched Android app , dubbed “ Cryptoy “, was developed by STEM (science, technology, engineering and maths) students on an industrial year placement at GCHQ. The Cryptoy app was highly appreciated and liked by GCHQ at the Cheltenham Science Festival that they made it available to download today.

The app allows users to share these encoded messages by using four code-breaking techniques – Shift, Substitution, Vigenère and Enigma. The messages can be shared with friends via social media or email, which can then be decoded by recipients with the help of the app.

One of the spokespersons from GCHQ said that the UK youngsters are needed to be motivated to take up subjects like maths and computer science. “If we’re going to get the next generation of security experts, we need to be encouraging them to take up these subjects,” she said at the conference, where the app was introduced and announced.

“Building maths and cyber skills in the younger generation is essential for maintaining the cyber security of the UK and growing a vibrant digital economy,” Robert Hannigan, Director GCHQ, said. “That is why I am keen for GCHQ to give something back through its work with school and universities.”

“In particular, the Cryptoy app is a colourful, interactive way for students and their teachers to explore the fascinating world of cryptography. The app was developed by GCHQ’s industrial placement students and trialled at a number of science fairs. I hope it will inspire further study of this key topic, which has played such an important part in our past and is an invaluable part of our future.”

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The agency says that the Cryptoy app only asks for very limited permissions and is not at all a surveillance tool – although the revelations by Edward Snowden made us all think 100 times before downloading and installing the app.