Even a very serious attack against SHA-512 would be unlikely to render it as weak as RIPEMD-160 (compare even e.g. MD4, which is pretty thoroughly broken but the attacks still take compute time). If you have the bits, it's better to spend them on a longer hash rather than more hashes.
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Even a very serious attack against SHA-512 would be unlikely to render it as weak as RIPEMD-160 (compare even e.g. MD4, which is pretty thoroughly broken but the attacks still take compute time). If you have the bits, it's better to spend them on a longer hash rather than more hashes.
Even a very serious attack against SHA-512 would
What makes you think you can predict the consequences of an attack against SHA-512?
Don't put all your eggs in one basket.
70 years of cryptographic history.
Don't use cryptographic primitives in ways they weren't designed for. That's a surefire recipe for disaster.