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--- efinf:blcks2017:crypto:start [2017/12/14 08:36]
Ivo Blöchliger [RSA]
+++ efinf:blcks2017:crypto:start [2017/12/20 22:00]
Ivo Blöchliger [News]
@@ 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
 ===== BadBlockChain =====
 {{ :efinf:blcks2017:crypto:badblockchain.zip |BadBlockChain in Python}}
@@ Line 40: / Line 48: @@
 ===== Anwendung BadBlockChain =====
+=== Key Management ===
+Key Erzeugen:
+<code python makekey.py>
+from  badkeymaterial import BadKeyMaterial
+print BadKeyMaterial(32)
+</code>
+Ausgabe z.B.
+  Public modulus: 4906493971 public exponent: 31  private exponent: 158269471
+Key verwenden:
+<code python initkey.py>
+from  badkeymaterial import BadKeyMaterial
+# modulus eintragen
+k=BadKeyMaterial(4906493971)
+# privaten Schlüssel setzen
+k.private = 158269471
+</code>
+Mining:
+<code python miner.py>
+from badblockchain import BadBlockChain
+from  badkeymaterial import BadKeyMaterial
+c = BadBlockChain()
+c.getNewBlocks()  # Blockchain import
+# modulus eintragen
+k=BadKeyMaterial(4906493971)
+# privaten Schlüssel setzen
+k.private = 158269471
+c.mine(k.modulus)
+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>