The changes are to be made by bringing into force some parts of the Police & Justice Act and the Serious Crime Act that have been passed but have remained inactive.
The Home Office said that a Statutory Instrument will bring those parts of the law into force in October 2008, though it could not give a precise date.
The specific outlawing of denial of service attacks was thought necessary after a teenager was cleared of any offence after sending five million emails to his employer.
Lennon's lawyer successfully argued that because his employer's email server was designed to accept emails, Lennon committed no offence in sending email to it.
The trial judge found that no offence had been committed under the Computer Misuse Act, though the Court of Appeal later ruled that the judge had been wrong to draw that conclusion.
The changes to the law were made in November 2006.
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