The records represent only a slice of all cyber attacks on the Fed because they include only cases involving the Washington-based Board of Governors, a federal agency that is subject to public records laws.
Reuters did not have access to reports by local cybersecurity teams at the central bank's 12 privately owned regional branches.
The disclosure of breaches at the Fed comes at a time when cybersecurity at central banks worldwide is under scrutiny after hackers stole $81 million from Bangladesh central bank account at the New York Fed.
Cyber thieves have targeted large financial institutions around the world, including America's largest bank JPMorgan, as well as smaller players like Ecuador's Banco del Austro and Vietnam's Tien Phong Bank.
Hacking attempts were cited in 140 of the 310 reports provided by the Fed's board. In some reports, the incidents were not classified in any way.
In eight information breaches between 2011 and 2013 - a time when the Fed's trading desk was buying massive amounts of bonds - Fed staff wrote that the cases involved "malicious code", referring to software used by hackers.
Four hacking incidents in 2012 were considered acts of "espionage", according to the records.
Information was disclosed in at least two of those incidents, according to the records. In the other two incidents, the records did not indicate whether there was a breach.
In all, the Fed's national team of cybersecurity experts, which operates mostly out of New Jersey, identified 51 cases of "information disclosure" involving the Fed's board.
Separate reports showed a local team at the board registered four such incidents.
The cases of information disclosure can refer to a range of ways unauthorised people see Fed information, from hacking attacks to Fed emails sent to the wrong recipients, according to two former Fed cybersecurity staffers who spoke on condition of anonymity.
The former employees said that cyber attacks on the Fed are about as common as at other large financial institutions.
It was unclear if the espionage incidents involved foreign governments, as has been suspected in some hacks of federal agencies.
Beginning in 2014, for instance, hackers stole more than 21 million background check records from the federal Office of Personnel Management, and US officials attributed the breach to the Chinese government, an accusation denied by Beijing.
Target for spying
Security analysts said foreign governments could stand to gain from inside Fed information.
China and Russia, for instance, are major players in the $13.8 trillion federal debt market where Fed policy plays a big role in setting interest rates.
"Obviously that makes it a very clear (hacking) target for other nation states," said Ari Schwartz, a former top cybersecurity adviser at the White House who is now with the law firm Venable.
US prosecutors in March accused hackers associated with Iran's government of attacking dozens of US banks.
In the records obtained by Reuters, espionage might also refer to spying by private companies, or even individuals such British activist Lauri Love, who is accused of infiltrating a server at a regional Fed branch in October 2012.
Love stole names, e-mail addresses, and phone numbers of Fed computer system users, according to a federal indictment.
The redacted reports obtained by Reuters do not mention Love or any other hacker by name.
The records point to breaches during a sensitive period for the Fed, which was ramping up aid for the struggling US economy by buying massive quantities of US government debt and mortgage-backed securities.
In 2010 and 2011, the Fed went on a $600 billion bond-buying spree that lowered interest rates and made bonds more expensive. It restarted purchases in September 2012 and expanded them up in December of that year.
The Fed cybersecurity records did not indicate whether hackers accessed sensitive information on the timing or amounts of bond purchases or used it for financial gain.
Up all night
The Fed's national cybersecurity team - the National Incident Response Team, or NIRT - created 263 of the incident reports obtained by Reuters.
NIRT operates in a fortress-like building in East Rutherford, New Jersey that also processes millions of dollars in cash everyday as part of the central bank's duty to keep the financial system running, according to the New York Fed's website.
The unit provides support to the local cybersecurity teams at the Fed's Board and regional banks, which process more than $3 trillion in payments every day.
The NIRT handles "higher impact" cases, according to a 2013 report by the Board of Governor's Office of Inspector General.
One of the two former NIRT employees interviewed by Reuters described being on a team that once worked around the clock for five-straight days to patch software hackers had used to gain access to Fed systems in an attempt to obtain passwords.
The former employee worked through several of those nights, taking naps at a desk in the office.
In that case, Fed security staff found no signs that sensitive information had been disclosed, the former employee said. Information about future interest rate policy discussions is isolated from other Fed networks and is more difficult for hackers to access, the former NIRT worker said.
But the Fed was under constant assault, much like any large company, the former employee said, and was "compromised frequently".
An internal watchdog has criticised the central bank for cybersecurity shortcomings.
A 2015 audit by the Fed board's Office of Inspector General found the board was not adequately scanning databases for vulnerabilities or putting enough restrictions on system access.
"There is heightened risk of unauthorized disclosure and inappropriate use of sensitive board information," according to the audit released in November.
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