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seen Sep 18 at 14:28

Aug
9
comment Specification of the Megamos crypto algorithm
Awesome answer. I wonder if someone taking a look at the software would leak more information without having to do any RE?
Aug
8
revised Specification of the Megamos crypto algorithm
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Aug
8
awarded  Teacher
Aug
8
revised Specification of the Megamos crypto algorithm
code -> binary for clarity.
Aug
8
answered Specification of the Megamos crypto algorithm
Jul
27
comment Specification of the Megamos crypto algorithm
The article is badly written - it really doesn't make clear what it means by "code(s)". Does it mean the algorithm? Or as per a lot of these secret algorithms, is there a key that is common across all cars?
May
21
awarded  Scholar
May
21
accepted What key length is required to keep simple keyed “hash” secure?
May
20
comment What key length is required to keep simple keyed “hash” secure?
My reading had led me to PRFs, but I was not confident that it was the correct term or the right way to think about this. Interestingly, you've touched upon one of my next questions.
May
20
comment What key length is required to keep simple keyed “hash” secure?
Thanks. The one-to-one mapping restricting the output set is very clear, I don't know why I didn't think of it.
May
20
comment What key length is required to keep simple keyed “hash” secure?
I have added the two things an attacker should not possibly do. Whilst a lot of those mappings might be poor, is there a better way of defining that? Is restricting it to one-to-one better?
May
20
revised What key length is required to keep simple keyed “hash” secure?
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May
20
asked What key length is required to keep simple keyed “hash” secure?
May
16
awarded  Student
May
16
comment Help me describe/identify this challenge-response protocol/algorithm?
I guess I should start another question about MACs where the input is the same length as output and key length is smaller.
May
16
comment Help me describe/identify this challenge-response protocol/algorithm?
Thanks Michael. I ran something really similar but it was a simple search in order rather than random. The average number of possibilities is very close to 1 indeed. I wonder if there is any way of expressing this more formally?
May
16
comment Help me describe/identify this challenge-response protocol/algorithm?
Thankyou for your answer. I had not observed 3a) but I had run a simulation on 3b) - on average a single pair is enough to guess the key.
May
16
awarded  Supporter
May
16
revised Help me describe/identify this challenge-response protocol/algorithm?
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May
16
revised Help me describe/identify this challenge-response protocol/algorithm?
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