A method and an apparatus for enciphering and deciphering content with symmetric and asymmetric cryptography with the use of the shadow numbering system where two or more shadow values are used with two or more base values with a two side equation, on one side the value to encipher is multiplied with one of the shadow value then the modulus taken with the base value, to decipher the enciphered value is multiplied with the shadow value that didn't take part of the first equation then the modulus is taken with the base value, thus, deciphering the enciphered value.