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Which security service is provided by symmetric systems?
Availability
Confidentiality
Integrity
Accountability
Such systems provide Confidentiality of data using a shared secret key. EDIT: But so do asymmetric algorithms. I'm more inclined to say that symmetrics provide availability better. Edit#2: Question was asking about symmetric systems; wasn't asking to make any type of comparison between the two. Edit #3: Although cryptography can be both symmetric and asymmetric, isn't hashing the best example of a symmetric (one-way) system? EDIT 4: I agree with EDIT2. The wording is not proper.
No hashing isn't decrypted so its not symmetric
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