RC4 Stream Cipher: Investigating Permutations of the Initial Array

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SUMMARY

The RC4 stream cipher operates by permuting an initial array of values from 0 to 255 based on a provided key. The discussion centers on whether there exists a key that results in the permutation S remaining unchanged, meaning it still spans from 0 to 255. The user suggests that a sequential key (1, 2, 3, ..., 255) could be as random as any other key, despite its predictable nature. This highlights the importance of key selection in maintaining the security of the RC4 algorithm.

PREREQUISITES
  • Understanding of RC4 stream cipher mechanics
  • Familiarity with permutation concepts in cryptography
  • Knowledge of key generation and its impact on encryption
  • Basic cryptographic principles and security implications
NEXT STEPS
  • Research the mathematical properties of permutations in cryptography
  • Explore the vulnerabilities of the RC4 stream cipher
  • Learn about alternative stream ciphers and their key management
  • Investigate the implications of key predictability on encryption security
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Cryptographers, security analysts, and software developers interested in encryption methods and the implications of key selection in stream ciphers.

chota
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hi,

I had a question regarding the rc4 stream cipher. I understand it is a bunch of permutations to the initial Array that goes from 0 to 255 with respect to the key.

However is there such a key such that after the permutation S is still the same? (ie still goes from 0 to 255)?

Any help would be appreciated, thanks
 
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I don't know if it is explicitly prohibited but it wouldn't necessarily matter - a key of 1,2,3,4,5...255 is just as random as any other if you don't know if advance that it's the one you are using.
 

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