![]() ![]() startswith ( "flag" ) assert len ( flag ) = 24 def lfsr ( R, mask ): output = ( R > 1 output ^= lastbit return ( output, lastbit ) def single_round ( R1, R1_mask, R2, R2_mask, R3, R3_mask ): ( R1_NEW, x1 ) = lfsr ( R1, R1_mask ) ( R2_NEW, x2 ) = lfsr ( R2, R2_mask ) ( R3_NEW, x3 ) = lfsr ( R3, R3_mask ) return ( R1_NEW, R2_NEW, R3_NEW ,( x1 * x2 ) ^ (( x2 ^ 1 ) * x3 )) R1 = int ( flag, 16 ) R2 = int ( flag, 16 ) R3 = int ( flag, 16 ) assert len ( bin ( R1 ) ) = 17 assert len ( bin ( R2 ) ) = 19 assert len ( bin ( R3 )) = 21 R1_mask = 0x10020 R2_mask = 0x4100c R3_mask = 0x100002 for fi in range ( 1024 ): print fi tmp1mb = & quot & quot for i in range ( 1024 ): tmp1kb = & quot & quot for j in range ( 1024 ): tmp = 0 for k in range ( 8 ): ( R1, R2, R3, out ) = single_round ( R1, R1_mask, R2, R2_mask, R3, R3_mask ) tmp = ( tmp << 1 ) ^ out tmp1kb += chr ( tmp ) tmp1mb + = tmp1kb f = open ( "./output/" + str ( fi ), "ab" ) f. The Operating Mechanism of the Java Layer in Androidįrom flag import flag assert flag. Introduction to The Principle of Integer OverflowĪndroid Application Operating Mechanism Brief Manually Find the IAT and Rebuild It Using ImportRECīasic Functions in the heap implementation ![]() Software Reverse Engineering IntroductionĬommon Encryption Algorithms and Code Recognition Cryptographic Security Pseudo-random Number Generator ![]()
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