Model Stealing (MS) attacks allow an adversary with black-box access to a Machine Learning model to replicate its functionality, compromising the confidentiality of the model. Such attacks train a clone model by using the predictions of the target model for different inputs. The effectiveness of such attacks relies heavily on the availability of data necessary to query the target model. Existing attacks either assume partial access to the dataset of the target model or availability of an alternate dataset with semantic similarities.

This paper proposes MAZE -- a data-free model stealing attack using zeroth-order gradient estimation. In contrast to prior works, MAZE does not require any data and instead creates synthetic data using a generative model. Inspired by recent works in data-free Knowledge Distillation (KD), we train the generative model using a disagreement objective to produce inputs that maximize disagreement between the clone and the target model. However, unlike the white-box setting of KD, where the gradient information is available, training a generator for model stealing requires performing black-box optimization, as it involves accessing the target model under attack. MAZE relies on zeroth-order gradient estimation to perform this optimization and enables a highly accurate MS attack.

Our evaluation with four datasets shows that MAZE provides a normalized clone accuracy in the range of 0.91x to 0.99x, and outperforms even the recent attacks that rely on partial data (JBDA, clone accuracy 0.13x to 0.69x) and surrogate data (KnockoffNets, clone accuracy 0.52x to 0.97x). We also study an extension of MAZE in the partial-data setting and develop MAZE-PD, which generates synthetic data closer to the target distribution. MAZE-PD further improves the clone accuracy (0.97x to 1.0x) and reduces the query required for the attack by 2x-24x.

A woman has jailed after she stole a doctor's identity card while he was in a pharmacy.

Police publish images of suspected thieves amid spate of stealing in northeastern United States

A THAMES Valley Police officer is accused of stealing food from his work canteen only one week into his new job.

The star of 'This Is England' talks to Annie Lord about the misrepresentation of working-class people on TV, the return of his show 'Brassic', and his struggles with medication for a bipolar disorder

ITV News has seen correspondence from Debenhams’ administrator to Bangladeshi suppliers demanding a 90% discount on garments orders.

An Adelaide mother is jailed for stealing from the Catholic Church to pay for expensive overseas holidays and indulgent consumer goods, while a former accountant is also sentenced for stealing from his clients.

Two former managers of the Bank of China and their wives were sentenced today after their convictions on Aug. 29, 2008, by a federal jury in Las Vegas on charges of racketeering, money laundering, international transportation of stolen property as well as passport and visa fraud.

A federal jury in Los Angeles convicted a physician assistant late yesterday for his role in a $7.7 million Medicare fraud scheme.

Robert Jeffery, 55, was convicted today by a federal jury in Alexandria, Va., for his role in a scheme to steal fuel worth approximately $39.6 million from the U.S. Army in Iraq.

Tyrone L. Ellis, a former civilian employee of the Department of Defense (DoD), was arrested yesterday and has been charged with conspiracy, conversion and false statements related to his alleged theft of Army Emergency Relief (AER) funds while he was employed at Camp Humphreys in the Republic of Korea.

A federal jury convicted Clark Alan Roberts, 47, and Sean Edward Howley, 39, both former engineers with Wyko Tire Technology Incorporated, located in Greenback, Tenn., of stealing trade secrets from the Goodyear Tire and Rubber Company.

An employee of the U.S. Embassy in Baghdad, Iraq, was found guilty today by a jury in Alexandria, Va., of stealing nearly $250,000 intended for the payment of shipping and customs services for the embassy.

A federal jury in Baton Rouge, La., today convicted a former research scientist of stealing trade secrets from Dow Chemical Company and selling them to companies in the People’s Republic of China, as well as committing perjury.

A jury in Natchez, Miss., yesterday convicted a Natchez Police Department officer of violating the civil rights of an arrestee by stealing credit and debit cards from the arrestee.

The founder and treasurer of the National Association of Special Police and Security Officers (NASPSO) was charged today in a superseding indictment with mail fraud, theft from a labor organization, obstruction of justice, criminal contempt and various recordkeeping offenses related to his operation of a pension plan for NASPSO members.

A former employee of the U.S. Embassy in Baghdad, Iraq, was sentenced today in U.S. District Court in Alexandria, Va., to 42 months in prison for stealing nearly $250,000 intended for the payment of shipping and customs services for the embassy.

A former civilian employee of the Department of Defense pleaded guilty today in Columbus, Ga., to conversion of Army Emergency Relief (AER) funds while he was employed at Camp Humphreys in the Republic of Korea.

A former U.S. Army sergeant pleaded guilty today to conspiring to steal U.S. Army equipment related to his work as a non-commissioned officer helping to train Iraqi army personnel in Mosul, Iraq, in 2008.

Rogelio Hackett Jr., 25, of Lithonia, Ga., was sentenced today to 120 months in prison by U.S. District Judge Anthony J. Trenga in Alexandria, Va., for trafficking in counterfeit credit cards and aggravated identity theft.

Tyrone L. Ellis, 56, of Columbus, Ga., was sentenced by U.S. District Judge Clay D. Land of the Middle District of Georgia.

Janika Fernae Bates Millbrook, Ala., was convicted of identity theft, wire fraud, aggravated identity theft and conspiracy to make false claims for tax refunds.

Janika Fernae Bates, a resident of Millbrook, Ala., was sentenced today in the Middle District of Alabama to 94 months in federal prison for stealing identities of student loan borrowers and providing them to a co-conspirator, who used them to file false tax returns.

Julie Matau, 49, of San Francisco, pleaded guilty to one count of wire fraud before U.S. District Judge Claudia Wilken. Andrea Matau, 28, also of San Francisco, pleaded guilty to one misdemeanor count of theft of federal funds before Judge Wilken.

A former research scientist was sentenced late yesterday to 60 months in prison for stealing trade secrets from Dow Chemical Company and selling them to companies in the People’s Republic of China, as well as committing perjury.

Julie Matau, 49, and her daughter, Andrea Matau, 28, each were sentenced yesterday in Oakland, Calif., for their participation in the theft of nearly $160,000 in federal grant funds from a now-defunct nonprofit American Samoa legal services corporation.

Former Fort Deposit, Ala., Police Officer Carlos Tyson Bennett was arrested today on charges of stealing money from motorists on Interstate 65 in central Alabama and subsequently trying to conceal his criminal activity, announced the Justice Department.

Jessie Alan Fuller, 25, of Pensacola, Fla., was sentenced today by U.S. District Judge W. Keith Watkins to 37 months in prison and two years supervised release, the Justice Department announced. Fuller pleaded guilty on April 26, 2012, to one count of conspiracy against rights, a felony, and one count of deprivation of rights under color of law, a misdemeanor. These charges stemmed from Fuller’s stealing money and property from motorists on Interstate 65 in central Alabama while he was a police officer with the Fort Deposit Police Department.

Kolon Industries Inc. and several of its executives and employees have been indicted for allegedly engaging in a multi-year campaign to steal trade secrets related to DuPont’s Kevlar para-aramid fiber and Teijin Limited’s Twaron para-aramid fiber. The indictment seeks forfeiture of at least $225 million in proceeds from the alleged theft of trade secrets from Kolon’s competitors.

Two former employees of the Alabama Administrative Office of the Courts were indicted today in Montgomery, Ala., for stealing the programming code for a sensitive court data system, announced Assistant Attorney General Lanny A. Breuer of the Justice Department’s Criminal Division and U.S. Attorney Joyce White Vance for the Northern District of Alabama.

The founder and president of the National Association of Special Police and Security Officers (NASPSO) – which represents private security guards assigned to protect federal buildings in the metropolitan Washington area – was convicted yesterday in Washington federal court, following a jury trial, of 18 counts related to his theft of union treasury and pension funds.

An indictment was unsealed today in Fort Pierce, Fla., charging Joseph Rizzuti with one count of corruptly endeavoring to obstruct the Internal Revenue Service (IRS) and four counts of wire fraud, the Justice Department and the IRS announced. The indictment was returned by a grand jury on Nov. 29, 2012.

A federal grand jury in Montgomery, Ala., returned a superseding indictment charging Deatrice Smith Williams and Quentin Collick for their roles in a stolen identity refund fraud conspiracy.

The founder and president of the National Association of Special Police and Security Officers (NASPSO) was sentenced to 76 months in prison today for stealing union treasury and pension funds.

Ammie Brothers, 29, of Columbus, Ga., a sergeant in the U.S. Army, pleaded guilty today to unlawfully obtaining personal information from the U.S. Army’s Army Knowledge Online computer system.

Tarrish Tellis of Montgomery County, Ala., pleaded guilty today to conspiracy, theft of public funds and aggravated identity theft, announced Assistant Attorney General Kathryn Keneally of the Justice Department's Tax Division and U.S. Attorney for the Middle District of Alabama George L. Beck Jr.

An information technology specialist working for the National Science Foundation (NSF) pleaded guilty late yesterday to theft of government property totaling more than $90,000

U.S. Army Sergeant Albert Kelly III, 28, of Fort Knox, Ky., pleaded guilty today to theft charges for his role in the theft of fuel at Forward Operating Base (FOB) Salerno in Afghanistan.

A civilian employee of the U.S. Navy posted at the Capodichino Navy Base near Naples, Italy, was arraigned yesterday in Norfolk, Va., for allegedly obtaining more than $360,000 in housing benefits that he was not entitled to receive.

The leader of an identity theft ring that stole more than 600 identities from U.S. government employees and others was sentenced today to serve 12 years in prison, followed by three years of supervised release.

Sybil Marshall Coles, 45, of Pamplin, Virginia, was sentenced today to serve five years in prison for aggravated identity theft and preparing a false tax return.

NORFOLK, Va

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Donald McAvoy, 28, who shares a father with the X-Men actor, allegedly stole the car in April from outside a house in Scotland and is behind bars another three weeks until he appears in court.

Ed Sheeran has found himself in another court battle in which he is being accused of 'stealing' material for his songs.

The 37-year-old singer repeatedly tried to steal her fellow coaches' contestants Monday on the The Voice and nabbed one from Gwen Stefani, 50.