I was trying to hash 'abc' as a hex number input on two different sites, but both give different hash.
Later I found out, that one site interprets it as '0abc' and the second one as 'abc0'.
Since I'm finishing my sha256 hashing program, I was wondering which one is correct.
Thank you
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Being a pentester, I have encountered a hash divided in two parts (the first one probably being the salt) seemingly encoded in Base64 but I am unable to find out the encryption type.
The input that gave me this hash is the string "password". Is anybody able to give me a hint ?
67Wm8zeMSS0=
s9bD0QOa7A6THDMLa39+3LmXgcxzUFdmszeZdlTUzjY=
Thanks in advance
Maybe it's SHA-256 encoded (or any other 256 bit hash algorithm), because if you base64 decode it and hex encode you get:
ebb5a6f3378c492d
b3d6c3d1039aec0e931c330b6b7f7edcb99781cc73505766b337997654d4ce36
The first has an length of 16 and the second a length of 64. That's probably not a coincidence.
Edit: Maybe it's hashed multiple times; an iterated hash. As this post says it is better to decompile the software.
I have three strings : StrA, StrB, StrC.
And their hash is YT56ejff653499TYK
Now, if someone give me hash of StrA, StrB and its hash is IEoeuor749Hueiur7x, is there a way to extract StrC from YT56ejff653499TYK and IEoeuor749Hueiur7x
Assuming you are referring to some of the standard one-way hash functions like SHA-2 or similar, this should never be possible.
For example, if this was possible by any mean it would make the password hash salting technique essentially a disclosure of the original password.
In short, with a one-way hash function which is not broken this should not be possible.
So I tried implementing the MD5 algorithm according to RFC1321 in C# and it works, but there is one thing about the way the padding is performed that I don't understand, here's an example:
If I want to hash the string "1" (without the quotation marks) this results in the following bit representation: 10001100
The next step is appending a single "1"-Bit, represented by 00000001 (big endian), which is followed by "0"-Bits, followed by a 64-bit representation of the length of the original message (low-order word first).
Since the length of the original message is 8 (Bits) I expected 00000000000000000000000000001000 00000000000000000000000000000000 to be appended (low-order word first). However this does not result in the correct hash value, but appending 00010000000000000000000000000000 00000000000000000000000000000000 does.
This looks as if suddenly the little-endian format is being used, but that does not really seem to make any sense at all, so I guess there must be something else that I am missing?
Yes, for md5 you have to add message length in little-endian.
So, message representation for "1" -> 49 -> 00110001, followed by single bit and zeroes. And after add message length in reversed order of bytes (the least significant byte first).
You could also check permutations step by step on this site: https://cse.unl.edu/~ssamal/crypto/genhash.php.
Or there: https://github.com/MrBlackk/md5_sha256-512_debugger
Simple question. What is the best (most universal) way to display a file hash? Below are two SHA256 hashes for the same file. One is displayed as base64 and one is...something else. The file hash will be used for auditing to make sure the file we send is the same as the file the auditor received. If the hash needs to be verified, I want to make sure I provide the hash that is the most easily verifiable.
SHA256 55461e72cccb74b475278189956b9db307bf44945e1639af93c34b224b7fcfd
SHA256 Base 64 VUYecszLdLR1J4GJlWudswe/RJReFjmvk8NLIkt/z9s=
55461e72cccb74b475278189956b9db307bf44945e1639af93c34b224b7fcfd
The point of Base64 is to constrain the character set to displayable characters. The hash is in hexadecimal which is even more constrained.
Simplest case: You want to make a text file which says "The MD5 hash of this file is FOOBARHASH". How do you embed the hash, knowing that the embedded hash value and the hash of the file are inter-related?
eg, Cisco embeds hash values into their IOS images, which can be verified like this:
cisco# verify s72033-advipservicesk9_wan-mz.122-33.SXH7.bin
Embedded Hash MD5 : D2BB0668310392BAC803BE5A0BCD0C6A
Computed Hash MD5 : D2BB0668310392BAC803BE5A0BCD0C6A
Maybe I'm mistaken, but trying to figure out how to do this blows my mind.
Originally, I stated that Ubuntu ISOs have a text file containing the MD5 hash of the entire ISO file. This was not correct: on second look, the md5sum.txt file contains hashes for individual files.
You don't. The hash value is computed by putting a "dummy" or an empty string where the signature should be, hashing that document, and then inserting the signature value into the text. To verify the signature of the document, you strip the signature out, hash the document without the signature, and compare the result to the signature you stripped out.
If you like that sort of challenge though, consider writing a program to produce self-describing pangrams:
This Pangram contains four as, one b, two cs, one d, thirty es, six fs, five gs, seven hs, eleven is, one j, one k, two ls, two ms, eighteen ns, fifteen os, two ps, one q, five rs, twenty-seven ss, eighteen ts, two us, seven vs, eight ws, two xs, three ys, & one z.
Have fun!