function OutVec = InvInitPerm(InVec)
%  OutVec = InvInitPerm(InVec)
% Input: Invec = a 64 bit binary vector
% Output: OutVec = another 64 bit vector that results from the first vector
% by applying the inverse of the initial permutation of DES to it.  
IPInv = [40	8	48	16	56	24	64	32	39	7	47	15	55	23	63	31	38	6	46	14	54	22	62	30	37	5	45	13	53	21	61	29	36	4	44	12	52	20	60	28	35	3	43	11	51	19	59	27	34	2	42	10	50	18	58	26	33	1	41	9	49	17	57	25];
OutVec = InVec(IPInv);