X.509 – the format that lays down the fundamentals of digital communication.

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If Thomas Edison had a needle to find in a haystack, he would not stop to reason where it was most likely to be, but would proceed at once with the feverish diligence of a bee, to examine straw after straw until he found the object of his search… Just a little theory and calculation would have saved him ninety percent of his labor.

Nicola Tesla