Password cracking: Difference between revisions
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== Identifying an algorithm == | == Identifying an algorithm == | ||
* Length: 16 | * Length: 32 characters (16 bytes) is likely to be MD5. | ||
* Characters: 0-9a-zA-Z is likely to be MD5. | * Characters: 0-9a-zA-Z is likely to be MD5. | ||
Revision as of 17:07, 22 July 2018
Initial steps
Steps required for password cracking software:
- Identify which columns contain the username and the password (hashed or otherwise). May be easier to convert to a standard internal representation before processing.
- Identify the algorithm used.
- Identify whether a salt is used.
From these there are multiple stages:
- If no salt is used (e.g. plain MD5), consult a pre-computed lookup table.
Identifying an algorithm
- Length: 32 characters (16 bytes) is likely to be MD5.
- Characters: 0-9a-zA-Z is likely to be MD5.
Lookup tables
- How should these be delivered? Plain text file, SQLite database, Lightning Memory-Mapped Database (LMDB), something else?
- What options does the chosen language support?
- Which options are the most efficient?
Libraries
Ultimately most libraries end up being a wrapper around OpenSSL.
Python
hashlib is the Python wrapper around OpenSSL and appears to be in the standard library.