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Robert Bigman

Former CIA security chief Robert Bigman attends the two-day 20th international Information Security Summit (IS2), held by TATE International, publishing Data Security Management journal, which starts at Karolinum grand hall in Prague, Czech Republic, on Wednesday, May 29, 2019. (CTK Photo/Katerina Sulova)

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Robert Bigman

Former CIA security chief Robert Bigman attends the two-day 20th international Information Security Summit (IS2), held by TATE International, publishing Data Security Management journal, which starts at Karolinum grand hall in Prague, Czech Republic, on Wednesday, May 29, 2019. (CTK Photo/Katerina Sulova)

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Robert Bigman

Former CIA security chief Robert Bigman attends the two-day 20th international Information Security Summit (IS2), held by TATE International, publishing Data Security Management journal, which starts at Karolinum grand hall in Prague, Czech Republic, on Wednesday, May 29, 2019. (CTK Photo/Katerina Sulova)

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Robert Bigman

Former CIA security chief Robert Bigman attends the two-day 20th international Information Security Summit (IS2), held by TATE International, publishing Data Security Management journal, which starts at Karolinum grand hall in Prague, Czech Republic, on Wednesday, May 29, 2019. (CTK Photo/Katerina Sulova)

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Robert Bigman

Former CIA security chief Robert Bigman attends the two-day 20th international Information Security Summit (IS2), held by TATE International, publishing Data Security Management journal, which starts at Karolinum grand hall in Prague, Czech Republic, on Wednesday, May 29, 2019. (CTK Photo/Katerina Sulova)

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Michael Zantovsky

Former Czech Ambassador to US and Director of the Vaclav Havel Library Michael Zantovsky attends the two-day 20th international Information Security Summit (IS2), held by TATE International, publishing Data Security Management journal, which starts at Karolinum grand hall in Prague, Czech Republic, on Wednesday, May 29, 2019. (CTK Photo/Katerina Sulova)

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Jeffrey Bardin

Intelligence officer Jeffrey Bardin attends the two-day 20th international Information Security Summit (IS2), held by TATE International, publishing Data Security Management journal, which starts at Karolinum grand hall in Prague, Czech Republic, on Wednesday, May 29, 2019. (CTK Photo/Katerina Sulova)

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Karolinum grand hall in Prague, Information Security Summit (IS2)

The two-day 20th international Information Security Summit (IS2), held by TATE International, publishing Data Security Management journal, which starts at Karolinum grand hall in Prague, Czech Republic, on Wednesday, May 29, 2019. (CTK Photo/Katerina Sulova)