Advances in convoy tactics, high frequency direction finding (referred to as "Huff-Duff"), radar, active sonar (called ASDIC in Britain), depth charges, ASW spigot mortars (also known as "hedgehog"), the intermittent cracking of the German Naval Enigma code, the introduction of the Leigh Light, the range of escort aircraft (especially with the use of escort carriers), and the full entry of the U.S. into the war with its enormous shipbuilding capacity, all turned the tide against the U-boats.
The development of digital computers and electronics after WWII made possible much more complex ciphers. Furthermore, computers allowed for the encryption of any kind of data representable in any binary format, unlike classical ciphers which only encrypted written language texts; this was new and significant. Computer use has thus supplanted linguistic cryptography, both for cipher design and cryptanalysis. Many computer ciphers can be characterized by their operation on binary bit
Before the modern era, cryptography was concerned solely with message confidentiality (i.e., encryption) — conversion of messages from a comprehensible form into an incomprehensible one and back again at the other end, rendering it unreadable by interceptors or eavesdroppers without secret knowledge (namely the key needed for decryption of that message). Encryption was used to (attempt to) ensure secrecy in communications, such as those of spies, military leaders, and diplomats. In recent
In 1951, Charlie and two other boys escaped and headed for California living entirely by burglary and auto theft. They got as far as Utah when they were caught. This time he was sent to the National Training School for Boys in Washington, D.C. While he was there they gave him various tests which established that his IQ was 109, that he was illiterate and that his aptitude for everything but music was average.
His keepers said this about him: "Manson has become somewhat of an 'institution
Eventually, all of the victims of the massacre at Sharon Tate's home were identified. The young man in the car was a teenager named Steve Parent who had come to visit Garretson, the caretaker. The two victims found outside the house were Abigail Folger and her lover, Voytek Frykowski. In the living room joined by rope were Sharon Tate and Jay Sebring.
A .22 caliber gun had shot Steve Parent, Jay Sebring and Voytek Frykowski. Of the five victims, all but Steve Parent had been stabbed