Black box & white box itself are two testing techniques...
It's just a googly Question ...
if any one knows sub techniques under white & black 
box .....please correct here

BlackBox Testing Techniques are as follows:
1)BoundaryValueAnalysis
2)Equivalence class Partition
3)Error Guesing
4)State Transition Testing
5)Decision table testing
6)Cause Effect Graph.
7)UseCase Testing
whiteBoxTesting Techniques are as follows:
1)Statement coverge testing
2)Loop Testing
3)Branch Coverage Testing

what ever sneha has told thats absolutely correct

black box testing techniques:
1.  boundary value analysis
2.  equalence class partition
3.  Error Guessing

White box testing techniques:

1.  basic path coverage
2.  programer techniq coverage
3.  loops or structural coverage

black box testing techniques :

1)boundary value analysis
2)equivalence class partition 
3)error guessing

white box testing techniques :

1)statement coverage
2)condition coverage
3)path coverage
4)loop coverage

Black Box and White Box are testing types and not testing 
techniques.
Testing techniques are as follows:-
The most popular Black box testing techniques are:-
Equivalence Partitioning.
Boundary Value Analysis.
Cause-Effect Graphing.
Error-Guessing.

The White-Box testing techniques are: - 
Statement coverage
Decision coverage
Condition coverage 
Decision-condition coverage
Multiple condition coverage
Basis Path Testing
Loop testing
Data flow testing 
Statement Coverage
Execute all statements at least once.
Decision Coverage
Execute each decision direction at least once.
Condition Coverage
Execute each decision with all possible outcomes at least 
once.
Decision/Condition Coverage
Execute all possible combinations of condition outcomes in 
each decision. Treat all iterations as two-way conditions 
exercising the loop zero times and one time.