As an emxalpe, tihs setnecne is eyncrtepd.

But I'll bet you can read every word of it. It's a bad algorithm.

AFAIK, and I could be wrong, these online storage/encryption places use their own algorithms. Even if they say they use publically available and secure algorithms, you don't know if they're telling the truth unless you download that algorithm independantly (from some other source), review it yourself, compile it yourself, and apply it yourself. Very few people will have the expertise or will power to review source code and compile themselves, but using a well known, vetted and proven product (I mention TrueCrypt again) takes you one step away from the total unknown of an online companies proprietary or undisclosed encryption algorithm.