hack-php the topic "Q1" of information security (intrusion acquisition $flag)

Address: http://202.120.7.133:8888/collision.php

is participating in the ISG competition, the amount, anyway is also the prize hopeless, but as a phper, meow I really feel this code is no problem ah ...
Ask the great God for doubts.
How to get $flag ...

Reply content:

Address: http://202.120.7.133:8888/collision.php

is participating in the ISG competition, the amount, anyway is also the prize hopeless, but as a phper, meow I really feel this code is no problem ah ...
Ask the great God for doubts.
How to get $flag ...

Http://202.120.7.133:8888/collision.php?md5=mcfog_42r6i8

In short, == this thing appears in the PHP code, it must be wrong.

The problem here is'0e1'=='0e2'

In other words, you need to find the string MD5 ' 0e number ' and write a loop to find it.

The probability is (1/16)^2 * (10/16)^30 , to find 500 million numbers, there is a 70% certainty to find

Let's try this.
Http://202.120.7.133:8888/collision.php?md5=QNKCDZO
Output Result:
ISG{NOT_ONLY_MD5_C0LLISI0N_BUT_ALS0_PROBL3M}

