The Metropolitan Police said it's a "great disappointment" that a senior counter-terrorism detective "abused her position" by offering to leak information to the News of The World on the phone-hacking inquiry.
An MPS spokesperson said:
There is no place for corrupt officers or staff in the MPS and we hope this prosecution demonstrates that leaking - or in this case trying to sell - confidential information to journalists for personal gain, will not be tolerated.
There may be occasions when putting certain information into the public domain - so-called whistle-blowing - can be justified. This was not one of them.
She [DCI April Casburn] betrayed the service and let down her colleagues - the hard-working honest police officers who make up the vast majority of the MPS.
The MPS highlighted this is the first prosecution to result from the phone-hacking and linked inquiries.
More top news
Billy Connolly has revealed how his close friend Robin Williams rang his to say goodbye just days before taking his own life.
The anti-war President is now in combat in two Middle Eastern countries.
Prince Harry received a great big hug from four-year-old Carson Hartley.