Throughout these decades, the alphanumeric key has been the main resource for entry into a computer system, although some users who obstinately saw in use some combinations which threaten the security of the same. Because this type of vulnerability and to the multiplicity of services appearing steadily Google acquired the company SlickLogin, who developed a system based on a mobile phone that emits a high frequency sound mechanism, inaudible, which provides a key to authenticate a computer.
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