NSA's Suite B Cryptography suggests some cryptographic algorithms for encryption, digital signatures, message digests and key agreements. The selected algorithms and their key size are suggested by the security level needed.
But is there any reason to think that the NSA suggests those algorithms because they know backdoors or something like that? Is it really secure to rely on those algorithms? Or should one assume that the NSA just suggests these algorithms in order to make people use algorithms with backdoors?