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.
The VigenÃ©re Cipher is a manual encryption method that is based on a variation of the Caesar Cipher. It works by applying a series of different Caesar Ciphers on the plaintext, based on the letters of a so-called keyword.