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The FBI has given back to Brazil, the hard drives aprehended by the brazilian Federal Police at the banker Daniel Danta's apartment, during the operation known as Satiagraha, in july 2008. After a whole year trying, the FBI gave up cracking the sophisticated encryption system used on the Opportunity Bank's files.
The hard drives were sent to the United States at the beginning of year 2009, after a failed attempt from the technicians from the Instituto Nacional de Criminalistica(INC, or in english, National Criminalistics Institute).
During the aprehension of the hard drives, the chief of the operation, deputy Protogenes Queiiroz, classified the files as having "secrets from the republic", according to the newspaper Folha de S. Paulo.
The brazilian government has no juridical means to order the company responsible for the encryption, or Daniel Dantas, to give away the access codes. The hard drives will remain on custody to the brazilian Federal Police, as the experts from the INC have hope on new information to arise from ongoing investigations, or either the invention of new technologies capable to cracking those encryptions.
Bank Opportunity said that the two softwares used for the encryption are avilable online and that one of them is a freeware. The other encryption system used (AES 256 bits) is one of the most sophisticated in the market today.
A technology inferior to that one, of 128 bits, is enough to create 3 x 10 to the 38th power number of combinations of passwords.
According to the bank's press release, Dantas affirmed, during the interrogations at the congress, that he was willing to give away the password to the files, to prove his innocense.