Terrorists have developed several new techniques to communicate with each online by leaving coded messages on websites like eBay and Reddit , claims a new book . The shocking discovery made by intelligence officers and code breakers in Israel , Britain and the United States revealed that seemingly innocuous chats are often much more , according to new sections in the book Gideon 's Spies : The Secret History of the Mossad . Code breakers found that al-Qaeda is now using a technique to encrypt its messages in goods offered for sale on eBay . Communication : Terrorists have developed several new techniques to communicate with each online by leaving coded messages on websites like eBay and Reddit . Secretive : Code breakers have found that al-Qaeda is now using a technique to encrypt its messages in goods offered for sale on eBay . Meanwhile , Israeli intelligence officers who spent time tracking the Internet message board Reddit found more than once , that a terrorist used hexadecimal characters and prime numbers as code . After the messages were decoded , they sometimes indicated an attack was being planned or even about to happen , according to excerpts printed in The New York Post . Terrorists are even hiding messages in ' X-rated pornographic pictures which conceal documents and orders for the next target , ' one intelligence source told author Gordon Thomas . In a fight back , MI6 in London and Mossad have recruited linguist specialists in Arabic , Urdu and Pashto to translate the online magazines that both al-Qaeda and ISIS are publishing with instructions . This , they hope will infiltrate a message about a planned attack before it takes place . In the wake of the brutal Charlie Hebdo massacre in Paris , both ISIS and al-Qaeda have been concealing messages to their followers . Both Mossad , the Israeli spy agency , and MI6 in London confirm that there has been an increase in this type of traffic online , according to the book . Cyber unit : The eleventh director of Mossad , Tamir Pardo , pictured , determined that Israel would use a cyber unit to avoid experiencing an event similar to the attacks on the World Trade Center in 2001 . Electronic war : Israeli Prime Minister Benjamin Netanyahu said that the country 's electronic battles against cyberattacks were regarded as Israel 's most important defense . Mossad : The front page of the website for Israel 's spy agency says it sees the 'invisible ' and does the 'impossible ' However , when an attack appears imminent in a particular country , Mossad sends details to that nation 's intelligence service 's cybercommand . By working with each other in unison , intelligence agencies hope to prevent future attacks . Cyber units worldwide are becoming increasingly important in the fight against terror . A number of the most skilled cryptologists in the Mossad unit for example , have mastered steganography , how to conceal secret information within a digital file . Cryptologists have the ability to explore an area inaccessible to the search engines of Google , Yahoo and Bing called the dark side , or dark web . This no-go zone contains billions of Web pages and is estimated to be 5,000 times larger than any other on the Internet . Much of this information is detailed in a 2015 version of a book by author Gordon Thomas called 'Gideon 's Spies : The Secret History of the Mossad . ' It delves into the clandestine world of Israel 's spy agency , the Mossad . Mossad is using its new cyberwarfare department to track threats and attack Iran 's nuclear capacity . The eleventh director of the spy agency , Tamir Pardo , was determined that Israel would not experience an event similar to the attacks on the World Trade Center in New York in 2001 . This decision came after it was revealed that an intercepted phone message by the American National Security Agency hinted at the 9/11 attack on the World Trade Center and the Pentagon - but it was caught too late . Pardo understood the importance of cyberwarfare after undergoing training at the NSA . He was backed by Israeli Prime Minister Benjamin Netanyahu who told him that their electronic battles against cyberattacks were regarded as Israel 's most important defense . Meanwhile , Iain Lobban , the head of Britain 's Government Communication Headquarters revealed the country 's Ministry of Defense was once targeted over 1,000 times a month . He identified the attacks were mostly coming from the Tenth Bureau , the highly secret department of China 's People Liberation Army responsible for science and technology . In the United States , General Keith B. Alexander , the head of the Pentagon 's Cyber Command , confirmed that 'our targets are enemy military command centers that we can reach from cyberspace . '
Al-Qaeda encrypts its messages in goods offered for sale on eBay , according to new claims from the book Gideon ’ s Spies : The Secret History of the Mossad . Author says other messages left on board Reddit used hexadecimal characters and prime numbers as code . Decoded messages often indicated when an attack was being planned . Intelligence agencies in Israel , the UK and U.S. are collaborating in a joint effort against cyber crime . Cyber crime units have to venture into area inaccessible to the search engines of Google , Yahoo and Bing called 'the dark side or dark web '