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.
Wiktionary (0.00 / 0 votes) Rate this definition: cipher (Noun). A numeric character. cipher (Noun). A method of transforming a text in order to conceal its meaning. The message was written in a simple cipher. Anyone could figure it out.