Simple Client Authentication APIs

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Hi All,
I have written a simple FTP Client-Server Code using Winsocks. Now I want to implement a simple Username-Password Authentication but after going through MSDN Authentication Links, I am very confused. Can you suggest some simple APIs for the same. Any help will be appreciated.

Posted 28-Feb-12 5:00am

Abhineet Ayan Verma

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Mohibur Rashid 29-Feb-12 2:47am

Would you tell me about Authentication for what? is that for FTP server?

Abhineet Ayan Verma 29-Feb-12 5:28am

Authentication for Client Credentials like Username and Password.

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JackDingler · Accepted Answer · 2012-02-28T07:10:00

The process is pretty easy. The trick is that you don't want to transmit the passwords over the wire.

A simple method would work like this.

1. Client connects
2. Server sends a login required packet with challenge string
3. Client encrypts the username + password + challenge string into a response string.
4. Client sends the user name and response string to login with.
5. The server verifies that it gets the same value for the response string.

You can use the MD5 hash for the challenge string and response string. There is plenty of example source code for this, and other hash types on the web.

Further, if you don't want to store passwords on the server, you can hash the password against a secret string, and store that. The client would then do the same to the password the user enters, before hashing it again against the username and challenge string.