Keval and the Lost Password

Keval is a great hacker. But he is very lazy one. He has recently hacked into his college's database. In this, he found that the passwords of all the students are written in an encrypted form, to which there exists a decryption rule. The rule is based on a string of jumbled alphabets. The string contains all the 26 unique alphabets but in a jumbled form, not the regular "abcdefghijklmnopqrstuvwxyz