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Title: Question Hash Sha256 Decrypt Post by: GaboBegue on September 18, 2017, 04:36:30 PM Hello:
I have a question about sha256 or sha512 decrypt: Suppose I want to decrypt this hash sha 256: "6A09E667BB67AE853C6EF372A54FF53A510E527F9B05688C1F83D9AB5BE0CD19" Step 1: A= (h0) 6A09E667 + ? = 6A09E667 -------> ? = 6A09E667 - 6A09E667 = 00000000 B= (h1) BB67AE85 + ? = BB67AE85 -------> ? = BB67AE85 - BB67AE85 = 00000000 C= (h2) 3C6EF372 + ? = 3C6EF372 -------> ? = 3C6EF372 - 3C6EF372 = 00000000 D= (h3) A54FF53A + ? = A54FF53A -------> ? = A54FF53A - A54FF53A = 00000000 E= (h4) 510E527F + ? = 510E527F -------> ? = 510E527F - 510E527F = 00000000 F= (h5) 9B05688C + ? = 9B05688C -------> ? = 9B05688C - 9B05688C = 00000000 G= (h6) 1F83D9AB + ? = 1F83D9AB -------> ? = 1F83D9AB - 1F83D9AB = 00000000 H= (h7) 5BE0CD19 + ? = 5BE0CD19 -------> ? = 5BE0CD19 - 5BE0CD19 = 00000000 Round 64 = A = 0000000 B = 0000000 C = 0000000 D = 0000000 E = 0000000 F = 0000000 G = 0000000 H = 0000000 Round 63= A = 0000000 B = 0000000 C = 0000000 D = ? E = 0000000 F = 0000000 G = 0000000 H = ? Being Round 64 E = 00000000 and E = D + [Ch(E,F,G) + Ma(A,B,C) + Σ0(A) + Σ1(E) + Wt + Kt] Is it possible that one of these is a negative hexadecimal number? Otherwise, E could not be worth "00000000". Or am I in procedural error? ??? Title: Re: Question Hash Sha256 Decrypt Post by: achow101 on September 18, 2017, 05:37:40 PM Hello: Hashes are not encryption; they cannot be decrypted or reversed. If they could, then the hash function would be broken.I have a question about sha256 or sha512 decrypt: Suppose I want to decrypt this hash sha 256: "6A09E667BB67AE853C6EF372A54FF53A510E527F9B05688C1F83D9AB5BE0CD19" Is it possible that one of these is a negative hexadecimal number? Each of the 4 byte numbers are 32-bit unsigned integers, so they cannot be negative. The addition of these are done modulo 2^32 so the numbers you sum will need to be some multiple of 2^32 in order for E to be 0x00000000.Otherwise, E could not be worth "00000000". Or am I in procedural error? ??? Title: Re: Question Hash Sha256 Decrypt Post by: GaboBegue on September 18, 2017, 05:55:38 PM Thank you for your help!
I now understand ;) |