Information encryption and decryption method, equipment and medium

The embodiment of the invention relates to an information encryption and decryption method and device and a medium, and the method comprises the steps: determining a password generator, and obtaining an initial value based on a random character numerical value conversion rule according to a feature parameter of the password generator; obtaining a corresponding initial value function value based on a random function and the initial value; on the basis of a random positive integer, modulus calculation and rounding are carried out on the initial value function value, so that an encryption displacement value is obtained; and encrypting the plaintext information by using the obtained encryption displacement value so as to obtain a ciphertext file. Therefore, by applying the method, as long as the password generator, the initial value and at least part of the initial value in the secret key are strictly isolated and accessed, the non-deciphering property of the ciphertext information can be ensured. 本公开的实施例涉及信息加解密方