Daniel Valente Dantas is a Brazil

Brazil

Brazil , officially the Federative Republic of Brazil , is the largest country in South America. It is the world's fifth largest country, both by geographical area and by population with over 192 million people...

ian banker and financier, founder of Opportunity Asset Management in 1994. Opportunity Group lead an international private sector partnership that bought up a large chunk of the Brazilian telecoms sector in 1997, when this sector was privatized. On December 2, 2008 Daniel Dantas was convicted of an attempt to bribe police officers; this is related to a police investigation into money laundering

Money laundering

Money laundering is the process of disguising illegal sources of money so that it looks like it came from legal sources. The methods by which money may be laundered are varied and can range in sophistication. Many regulatory and governmental authorities quote estimates each year for the amount...

. He has appealed against his conviction.

Dantas was arrested twice by Protógenes Queiroz

Protógenes Queiroz

Protógenes Pinheiro Queiroz is a Brazilian Federal Police officer who has led investigations in some of the country's most high profile corruption cases. Queiroz was responsible for investigations leading to imprisonment of the former mayor of São Paulo, Paulo Maluf...

, police officer who investigated Daniel Dantas on Satiagraha Operation, in early July 2008, but each time released almost immediately. The President of the Supreme Court Gilmar Mendes

Gilmar Mendes

Gilmar Ferreira Mendes is a Brazilian Justice of the Supremo Tribunal Federal , since being appointed by then President Fernando Henrique Cardoso in 2002...

 gave Dantas two habeas corpus

Habeas corpus

is a writ, or legal action, through which a prisoner can be released from unlawful detention. The remedy can be sought by the prisoner or by another person coming to his aid. Habeas corpus originated in the English legal system, but it is now available in many nations...

 in less than two days.

Daniel Dantas was finally convicted to ten years imprisonment in December 2008 for attempting to bribe a police officer.

National Council of Justice: Conduct of Judge De Sanctis in Satyagraha is incompatible with a judge’s behavior and with the due process.
On June 7th, 2011 the National Council of Justice (CNJ) unanimously recognized that Judge Fausto de Sanctis, at the time the head judge of the 6th Criminal Court of São Paulo, intentionally disobeyed the orders of the Federal Supreme Court (STF), when he ordered the detention of Daniel Dantas in Operation Satyagraha.
The judges of the CNJ followed the vote of reporting Judge Morgana Richa, who determined that De Sanctis’s conduct is incompatible with that of a judge, and that he would only escape proper punishment through the lack of a legal provision.

STF voids Satyagraha for irregularities.
Also on the 7th June 2011, the Higher Court of Justice (STJ) accepted the opinion of the Federal Public Prosecutor’s Office and voided the criminal action originating from Operation Satyagraha, for its irregularities.
According to the President of the 5th Bench of the Higher Court of Justice, Jorge Mussi, “the involvement of ABIN (Brazilian Intelligence Agency) was demonstrated in a document in which the Federal Police ordered the internal investigation of irregularities in the operation”.
The scheme of informal investigation set up in Satyagraha represents, for Mussi, “a model of investigation more suited to the secret police, beyond the most basic rules of the Democratic State of Law”.

Operation Satyagraha

In July 2008, several TrueCrypt

TrueCrypt

TrueCrypt is a software application used for on-the-fly encryption . It is free and open source. It can create a virtual encrypted disk within a file or encrypt a partition or the entire storage device .- Operating systems :TrueCrypt supports Microsoft Windows, Mac OS X, and...

-secured hard drives were seized from Daniel Dantas, who was suspected of financial crimes. The Brazilian National Institute of Criminology (INC) tried for five months (without success) to obtain access to TrueCrypt-protected disks owned by the banker, after which they enlisted the help of the FBI. The FBI used dictionary attack

Dictionary attack

In cryptanalysis and computer security, a dictionary attack is a technique for defeating a cipher or authentication mechanism by trying to determine its decryption key or passphrase by searching likely possibilities.-Technique:...

s against Dantas' disks for over 12 months, but were still unable to decrypt them.