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- Variably_Modified_Permutation_Composition abstract "VMPC (Variably Modified Permutation Composition) is a stream cipher technology designed by Bartosz Zoltak, presented in 2004 at the Fast Software Encryption conference. VMPC is a modification of the RC4 cipher.The core of the cipher is the VMPC function, a transformation of n-element permutations defined as:for x from 0 do n-1: g(x) = VMPC(f)(x) = f(f(f(x))+1)The function was designed such that inverting it, i.e. obtaining f from g, would be a complex problem. According to computer simulations the average number of operations required to recover f from g for a 16-element permutation is about 211, for 64-element permutation - about 253 and for a 256-element permutation - about 2260.In 2006 at Cambridge University, Kamil Kulesza investigated the problem of inverting VMPC and concluded \"results indicate that VMPC is not a good candidate for a cryptographic one-way function\".The VMPC function is used in an encryption algorithm - the VMPC stream cipher. The algorithm allows for efficient in software implementations; to encrypt L bytes of plaintext do:1. n = 02. Repeat steps 3-6 L times:3. s = P[ (s + P[n]) mod 256 ]4. Output = P[ (P[P[s]]+1) mod 256 ]5. Temp = P[n] P[n] = P[s] P[s] = Temp6. n = (n + 1) mod 256Where 256-element permutation P and integer value s are obtained from the encryption password using the VMPC-KSA (Key Scheduling Algorithm).".
- Variably_Modified_Permutation_Composition wikiPageExternalLink vmpcksa3.zip.
- Variably_Modified_Permutation_Composition wikiPageExternalLink vmpclib.dpr.
- Variably_Modified_Permutation_Composition wikiPageExternalLink 4950.
- Variably_Modified_Permutation_Composition wikiPageExternalLink vmpc.pdf.
- Variably_Modified_Permutation_Composition wikiPageExternalLink www.vmpcfunction.com.
- Variably_Modified_Permutation_Composition wikiPageID "31673876".
- Variably_Modified_Permutation_Composition wikiPageLength "2580".
- Variably_Modified_Permutation_Composition wikiPageOutDegree "7".
- Variably_Modified_Permutation_Composition wikiPageRevisionID "682305944".
- Variably_Modified_Permutation_Composition wikiPageWikiLink Category:Cryptography.
- Variably_Modified_Permutation_Composition wikiPageWikiLink Encryption.
- Variably_Modified_Permutation_Composition wikiPageWikiLink Fast_Software_Encryption.
- Variably_Modified_Permutation_Composition wikiPageWikiLink Permutation.
- Variably_Modified_Permutation_Composition wikiPageWikiLink RC4.
- Variably_Modified_Permutation_Composition wikiPageWikiLink Stream_cipher.
- Variably_Modified_Permutation_Composition wikiPageWikiLinkText "VMPC".
- Variably_Modified_Permutation_Composition wikiPageWikiLinkText "Variably Modified Permutation Composition".
- Variably_Modified_Permutation_Composition wikiPageUsesTemplate Template:Citation_needed.
- Variably_Modified_Permutation_Composition wikiPageUsesTemplate Template:Context.
- Variably_Modified_Permutation_Composition wikiPageUsesTemplate Template:Crypto-stub.
- Variably_Modified_Permutation_Composition wikiPageUsesTemplate Template:Reflist.
- Variably_Modified_Permutation_Composition subject Category:Cryptography.
- Variably_Modified_Permutation_Composition hypernym Technology.
- Variably_Modified_Permutation_Composition type Company.
- Variably_Modified_Permutation_Composition type Communication.
- Variably_Modified_Permutation_Composition type Page.
- Variably_Modified_Permutation_Composition comment "VMPC (Variably Modified Permutation Composition) is a stream cipher technology designed by Bartosz Zoltak, presented in 2004 at the Fast Software Encryption conference. VMPC is a modification of the RC4 cipher.The core of the cipher is the VMPC function, a transformation of n-element permutations defined as:for x from 0 do n-1: g(x) = VMPC(f)(x) = f(f(f(x))+1)The function was designed such that inverting it, i.e. obtaining f from g, would be a complex problem.".
- Variably_Modified_Permutation_Composition label "Variably Modified Permutation Composition".
- Variably_Modified_Permutation_Composition sameAs Q4052549.
- Variably_Modified_Permutation_Composition sameAs VMPC.
- Variably_Modified_Permutation_Composition sameAs m.0btn_3.
- Variably_Modified_Permutation_Composition sameAs VMPC.
- Variably_Modified_Permutation_Composition sameAs Q4052549.
- Variably_Modified_Permutation_Composition wasDerivedFrom Variably_Modified_Permutation_Composition?oldid=682305944.
- Variably_Modified_Permutation_Composition homepage vmpcksa3.zip.
- Variably_Modified_Permutation_Composition isPrimaryTopicOf Variably_Modified_Permutation_Composition.