Login verification method and system, server and login system

The invention discloses a login verification method and system, a server and a login system, and relates to the field of information security, and the method comprises the steps: when an account is registered, an account and a password ciphertext are stored in an information base, and the password ciphertext is obtained through encryption calculation of the account and a password corresponding to the account; when a random data block request is received, generating a disposable random data block, storing the random data block in a preset space, and sending the random data block to a user; when a login request is received, login verification is carried out according to an account and an abstract in the login request, a password ciphertext in an information base and a random data block in a preset space, and the abstract is obtained by carrying out encryption calculation on the random data block and the password ciphertext; and if the verification is passed, confirming that the login succeeds, and returning a l