Discuss EC-Council 212-81 Exam Topic 1 Question 10

What must occur in order for a cipher to be considered 'broken'?

AUncovering the algorithm used

BDecoding the key

CFinding any method that is more efficient than brute force

DRendering the cipher no longer useable

Suggested Answer: C

Finding any method that is more efficient than brute force

https://en.wikipedia.org/wiki/Cryptanalysis

Bruce Schneier notes that even computationally impractical attacks can be considered breaks: 'Breaking a cipher simply means finding a weakness in the cipher that can be exploited with a complexity less than brute force.'

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12 comments · newest first

Ollie 11 months ago

Totally agree, if it's no longer usable, it's broken for sure!

Nilsa 11 months ago

Wait, can a cipher be broken without decoding the key?

Brynn 12 months ago

Definitely, finding a better method than brute force counts as broken.

Pamella 12 months ago

I think uncovering the algorithm is key too.

Anthony 1 year ago

It's all about decoding the key!

King 1 year ago

I think rendering the cipher unusable is a strong point, but I’m not entirely convinced that’s the only way to define it. It feels like there are multiple angles to consider.

Rueben 1 year ago

I feel like uncovering the algorithm is important, but it might not be enough on its own. I wonder if there's a specific definition we need to remember.

Maryln 1 year ago

I remember a practice question about breaking ciphers, and I think it had to do with finding a more efficient method than brute force. That might be what they mean by 'broken.'

Dottie 1 year ago

I think a cipher is considered broken when you can decode it without the key, but I'm not sure if that means just finding the key or something else.

Kasandra 1 year ago

This looks like a straightforward question about identifying the applications that are part of Microsoft 365 Apps for enterprise. I'm pretty confident I can get this right.

Janessa 1 year ago

I think it's 'All of the above' - a good fraud risk management program should cover prevention, mitigation, and consequences.

Pamella 1 year ago

Hmm, I'm a little confused. Do I need to do anything special to save the theme file in the default location? I want to make sure I get this right.

EC-Council 212-81 Exam - Topic 1 Question 10 Discussion