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Random number generator attack
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===Java nonce collision=== In August 2013, it was revealed that bugs in the [[Java (programming language)|Java]] class [http://docs.oracle.com/javase/7/docs/api/java/security/SecureRandom.html SecureRandom] could generate collisions in the ''k'' nonce values used for ECDSA in implementations of [[Bitcoin]] on [[Android (operating system)|Android]]. When this occurred the private key could be recovered, in turn allowing stealing [[Bitcoin]]s from the containing [[Cryptocurrency wallet|wallet]].<ref>{{cite web |title=Android bug batters Bitcoin wallets |url=https://www.theregister.co.uk/2013/08/12/android_bug_batters_bitcoin_wallets/ |last=Chirgwin |first=Richard |website=The Register |date=12 August 2013}}</ref>
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