According to U.S. media reports, the U.S. Central Intelligence Agency on April 19 said they had 6 copies of declassified secret documents during the First World War, many of which were involved in espionage work.
CIA officials said in a statement released the same day, "these documents kept secret for nearly a century, until recently, to a certain degree of technological development, only the Secret possibility of these documents." In recent years, Invisibility Potion chemical preparation, development advances, so to see the light of these confidential documents.
It is understood that these documents recorded in the year of the spies, senior military officers and diplomats in the war for a long time after the end of the "diplomatic war" in the top scientific and technological means used, which unveils how to use invisible between the Allies ink transfer letters, without leaving any traces spies how to read each other's secret files.
It is reported that there is a French declassified documents confidential, a record of the secret of invisible ink prepared in Germany, France, at the time that the enemy has cracked the password.
Currently, this group of CIA declassified documents has been able to get the official web site for academic research.
CIA officials said in a statement released the same day, "these documents kept secret for nearly a century, until recently, to a certain degree of technological development, only the Secret possibility of these documents." In recent years, Invisibility Potion chemical preparation, development advances, so to see the light of these confidential documents.
It is understood that these documents recorded in the year of the spies, senior military officers and diplomats in the war for a long time after the end of the "diplomatic war" in the top scientific and technological means used, which unveils how to use invisible between the Allies ink transfer letters, without leaving any traces spies how to read each other's secret files.
It is reported that there is a French declassified documents confidential, a record of the secret of invisible ink prepared in Germany, France, at the time that the enemy has cracked the password.
Currently, this group of CIA declassified documents has been able to get the official web site for academic research.
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