text: For example, when the e-mail address 'U13user@dictionary.com' is hashed, the result or "hash value" might be 'a8der13ap69'. Every time that hash function is applied to that e-mail address the result will be the same. It is called one-way hashing because the function allows you to convert the data only one way. So while it is possible to convert an e-mail address into a hash value, it is not possible to convert that value back into the e-mail address.