Mathematics! Help!

[Gammawolf]

Hey there, just a question for all you maths geniuses out there! Say I have the equation:

B = g^b mod p

I know all the values except for b, and p is a prime number which is also known. How do I go about finding b, I can't for the life of me figure this out because of the mod operator! Reversing it just confuses me Does anyone know where I can get started to solve this one? If it helps its in relation to Diffie-Hellman key exchange methods

 

[Gammawolf]

Where is the second unknown? Are you referring to the g^b before the modulus operator is applied?

 

[Gammawolf]

So basically my cryptography lecturer is having one on with me? It is the last one of a set of 30 questions so its not unlikely that he's just set one that cannot be feasibly done