25.md5 collision(NUPT_CTF)

 

Seize two tips:

1.md5 collision

2.please input a

== 0 is set up using the string, which can bypass the MD5 checksum.
So find a md5 is the value at the beginning of 0e, because the string php when dealing == encountered when one side is beginning to put the string of a string of 0e considered scientific notation, so that 0

So payload:  ? A = s878926199a

                              s155964671a
                              s214587387a
                              s214587387a
                              s878926199a
                              pick a