Reversing using C

A simple way to demonstrate common reversing tricks using C code: 1.XOR cipher execution simple repeating-key XOR extremely common in obfuscation 2.Known-plaintext attack if you know part of the plaintext, you can recover the key 3.Key length recovery detect repeating patterns in the keystream #include #include #include #include static void xmem ( uint8_t * b , size_t n , const uint8_t * k , size_t klen ) { if ( ! b || ! k || klen == 0 ) return ; size_t i = 0 , j = 0 ; for (; i n ; i ++ ) { b [