efinf:blcks2017:crypto:start

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efinf:blcks2017:crypto:start [2017/12/14 08:55]
Ivo Blöchliger [Anwendung BadBlockChain]
efinf:blcks2017:crypto:start [2017/12/20 22:08] (current)
Ivo Blöchliger [Theorie]
Line 1: Line 1:
 +===== News =====
 +  * https://www.technologyreview.com/s/609771/a-cryptocurrency-without-a-blockchain-has-been-built-to-outperform-bitcoin/
 +
 +===== Theorie =====
 +  * Hashfunktion: https://de.wikipedia.org/wiki/Kryptologische_Hashfunktion
 +  * Asymmetrische Kryptographie: https://de.wikipedia.org/wiki/Asymmetrisches_Kryptosystem
 +  * Public-Key Verschlüsselung: https://de.wikipedia.org/wiki/Public-Key-Verschl%C3%BCsselungsverfahren
 +  * RSA-Verschlüsselung: https://de.wikipedia.org/wiki/RSA-Kryptosystem
 +  * Blockchain: https://de.wikipedia.org/wiki/Blockchain
 ===== BadBlockChain ===== ===== BadBlockChain =====
 {{ :efinf:blcks2017:crypto:badblockchain.zip |BadBlockChain in Python}} {{ :efinf:blcks2017:crypto:badblockchain.zip |BadBlockChain in Python}}
Line 76: Line 85:
  
 print c.wallets.wallets print c.wallets.wallets
 +
 +</code>
 +
 +Neue Hash-Funktion:
 +<code python>
 +   # 32-Bit Hash
 +    @classmethod
 +    def badHash(cls,x):
 +        x = str(x)
 +        h = 0xdeadbeef
 +        for i in xrange(0,len(x)):
 +            h = ((h+6543)*(ord(x[i])+57361)+567) % 2**32
 +        return h
  
 </code> </code>
  • efinf/blcks2017/crypto/start.1513238109.txt.gz
  • Last modified: 2017/12/14 08:55
  • by Ivo Blöchliger