Hot answers tagged untagged
Moving my reply from the comments into a proper answer. The general case of double-encrypting is formally explained by Yehuda Lindell in this answer on crypto.SE. Summing up: Same Algorithm, same key: It may or may not be secure, depending on the properties of the cipher. It is definitely not always secure, but may be secure for practical cases. Same ...
Only top voted, non community-wiki answers of a minimum length are eligible