[rc5] key security question
Benedikt Eric Heinen
beh at icemark.ch
Thu Jun 5 20:18:51 EDT 1997
I don't know about the specific details of the RC5 or other encryption
methods (neither do I have the mathematical knowledge to understand them),
but I am curious - what happens when I encrypt some plaintext using 56bit
RC5 and then encrypt the result with another RC5 56bit key.
How secure will the resulting file be? How do those keys work?
- Is there still a single 56bit key that can decrypt the file (i.e.
the second encryption doesn't give any additional security)?
- Do the bits just add up (i.e. the resulting ciphertext will be
like it was encrypted using a single 112 byte key)?
- Do the keys multiply (i.e. the result would be like it was encrypted
using a 56^2 bit key)?
- Will the keys power each other (56^56 bit protection)?
I guess, it's either the first or third - I am not sure which one applies.
But - I'd be curious to know...
Benedikt
signoff
Hiroshima '45 Chernobyl '86 Windows '95
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