Question: string some_hash(const string& input) { string retval = x0fxffx00; for (size_t i = 0; i < input.length(); ++i) { retval[0] ^= input[i]; retval[1] &= input[i];

string some_hash(const string& input) { string retval = "\x0f\xff\x00"; for (size_t i = 0; i < input.length(); ++i) { retval[0] ^= input[i]; retval[1] &= input[i]; retval[2] |= input[i]; } return retval; } Show that some hash is not suitable as a cryptographic hash function, by giving an example collision and a method to generate second-preimages for any arbitary value.

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