Brazil has begun issuing passports with a validity of 10 years and a new cover and security features.According to Brazilian media, the Federal Police say the new passport uses a new digital signature on the chip based on stronger encryption.Until last year, Brazil intended to use an encryption standard sponsored by the US, called V3. However, leaked documents by Edward Snowden showed that the NSA had deliberately supported the inclusion flaws in it to allow spying, reported Gizmodo Brasil.So instead the government has adopted elliptic-curve cryptography for the new Brazilian passport.Brazil has also joined the Public Key Directory of ICAO (International Civil Aviation Organization), the news report added.