Changes between Version 55 and Version 56 of NewCaps/WhatCouldGoWrong


Ignore:
Timestamp:
2011-02-22T05:27:49Z (13 years ago)
Author:
davidsarah
Comment:

take into account multi-target attacks against encryption

Legend:

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  • NewCaps/WhatCouldGoWrong

    v55 v56  
    66||#||''what bad thing could happen''||''how''||''who could do it''||''what could they target''||''what crypto property prevents it''||''how expensive to brute force'' [footnote 9]||
    77||1||shape-shifter immutable file [footnote 1]||collide read-cap (''R'',''T'')||creator of a file||their own file||the hash function's and cap format's collision resistance on the read-cap (''R'',''T''). This also depends on the encryption of ''K1'' being deterministic and correct, and on the suitability of hash_''r'' as a KDF (key derivation function).||approx sqrt(2.''p'').2^(''r''+''t'')/2^ [footnotes 7,8]||
    8 ||2||unauthorized read||attack the encryption of ''K1'' with ''R''||anyone||any one file||the security of the encryption scheme used for ''K1'', the secrecy of the read-key ''R'', and the suitability of hash_''r'' as a KDF.||''p''.2^min(''r'',''k'')^||
     8||2||unauthorized read||attack the encryption of ''K1'' with ''R''||anyone||any one file||the security of the encryption scheme used for ''K1'', the secrecy of the read-key ''R'', and the suitability of hash_''r'' as a KDF.||(''p''/''N'').2^min(''r'',''k'')^||
    99||3||forgery of immutable file||generate a matching read-cap (''R'',''T'') for someone else's file||anyone||any one file||the hash function's and cap format's second-preimage resistance on (''R'',''T''). This also depends on the encryption of ''K1'' being deterministic and correct, and on the suitability of hash_''r'' as a KDF.||(''p''/''N'').2^''r''+''t''^ [footnotes 5,8]||
    1010||4||roadblock or speedbump [footnote 2]||generate (''EncK1'',''Dhash'',''V'') that hash to someone else's ''T'', and copy their ''S''||anyone [footnote 6]||any one file||the hash function's and cap format's second-preimage resistance on ''T''||(''p''/''N'').2^''t''^||
    11 ||5||unauthorized read||attack the encryption of the plaintext with ''K1''||anyone||any one file||the security of the encryption scheme used for the plaintext, and the secrecy of the encryption key ''K1''. The latter also depends on the security and seeding of the RNG that generated it, and on resistance to attack !#2.||''p''.2^''k''^||
     11||5||unauthorized read||attack the encryption of the plaintext with ''K1''||anyone||any one file||the security of the encryption scheme used for the plaintext, and the secrecy of the encryption key ''K1''. The latter also depends on the security and seeding of the RNG that generated it, and on resistance to attack !#2.||(''p''/''N'').2^''k''^||
    1212||6||unauthorized read||figure out the input to the hash function that generates ''S''||anyone||any one file||the hash function's onewayness for (''R'',''T'') -> ''S''||brute force on ''R'' is !#2||
    1313||7||unauthorized deletion||figure out a working destroy-key ''KD'' for a given ''Dhash''||anyone||any one file||the hash function's preimage resistance on ''Dhash'' and the secrecy of ''KD''||(''p''/''N'').2^min(''d'',''dh'')^||