article_snippet: 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.
article_snippet: Terrorists have developed several new techniques to communicate with each online by leaving coded messages on websites like eBay and Reddit eBay .
article_snippet: Reddit found more than once, that a terrorist used hexadecimal characters and prime numbers as code.
article_snippet: After the messages were decoded, the messages sometimes indicated an attack was being planned or even about to happen, according to excerpts printed in The New York Post.
article_snippet: 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.
article_snippet: This, al-Qaeda and ISIS hope will infiltrate a message about a planned attack before a planned attack takes place.
article_snippet: In the wake of the brutal Charlie Hebdo massacre in Paris, both ISIS and al-Qaeda have been concealing messages to ISIS and al-Qaeda followers.
article_snippet: This decision came after This decision 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 This decision was caught too late.
highlights_snippet: Author says other messages left on board Reddit used hexadecimal characters and prime numbers as code .
  
highlights_snippet: Decoded messages often indicated when an attack was being planned .
  