A fiber, a single filament of natural material, such as cotton, linen or wool, or artificial material such as nylon, polyester, metal or mineral fiber, or man made natural fibre like Viscose, Modal & Excel is measured in terms of linear mass density, the weight of a given length of fiber.
The vernam cipher, sometimes known as the 'one time pad', is a stream cipher, which providing certain requirements are met, can be theoretically unbreakable.
LINK / CITE ADD TO WORD LIST. noun. The definition of a cipher is the symbol 0 meaning zero, or a secret code, something written in code, or a key used to figure out the meaning of something written in code. The symbol 0 entered on a form to show a zero quantity is an example of a cipher.