MD5Algorithm
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MD5 & Hash Encryption provides an overview of MD5 and hash encryption algorithms. It discusses the purpose and examples of MD5, how the MD5 algorithm works, potential security risks like collisions, and practical applications through code. It also covers how difficult MD5 is to crack through brute force, though flaws in the algorithm allow for exploits, and discusses how MD5 is used for digital signatures, certificates, and one-way encryption storage.
![[location] md5 attr. (word/file)
Attributes:
-s indicates string input, not file!
ex. md5 -s test
-r reverses print of hash/word
ex md5 -r -s test
-q overrides -r, only md5 sum printed
ex md5 -q -s test
-t built-in time test
ex md5 -t
Other Attributes: [-p -x]
Note:
-s must be the last attribute
or it will think everything
past is the string
Macintosh MD5 Terminal
Execution](https://image.slidesharecdn.com/6c4e8fd8-4c1d-4d1b-9243-2e44d441e79b-150629070544-lva1-app6891/85/MD5Algorithm-3-320.jpg)
![Windows md5 Command Line
Execution
Not Built In To Windows Command Line
Example
md5sum [filename]
Ex: C:/md5sum test.txt
[Or wherever the md5sum.exe is located]
-b Reads Files In Binary Mode
-c Checks Digest Against Given List
-w Warns About Improperly Formatted md5 Checksums](https://image.slidesharecdn.com/6c4e8fd8-4c1d-4d1b-9243-2e44d441e79b-150629070544-lva1-app6891/85/MD5Algorithm-4-320.jpg)
MD5Algorithm
- 1. MD5 & Hash Encryption
- 2. Overview • Purpose of MD5 and Hash Encryptions • Examples • MD5 Algorithm • Explanation of Possible Security Risks • Practical Applications Through Code • Possible Future Security Risks
- 3. [location] md5 attr. (word/file) Attributes: -s indicates string input, not file! ex. md5 -s test -r reverses print of hash/word ex md5 -r -s test -q overrides -r, only md5 sum printed ex md5 -q -s test -t built-in time test ex md5 -t Other Attributes: [-p -x] Note: -s must be the last attribute or it will think everything past is the string Macintosh MD5 Terminal Execution
- 4. Windows md5 Command Line Execution Not Built In To Windows Command Line Example md5sum [filename] Ex: C:/md5sum test.txt [Or wherever the md5sum.exe is located] -b Reads Files In Binary Mode -c Checks Digest Against Given List -w Warns About Improperly Formatted md5 Checksums
- 5. Difficulty In Cracking • Md5, with its 128bit encryption algorithm has 1,280,000,000,000,000,000 possible combinations. • Even if the exact same hash value found, possible other string combination could have created it. • It is considered that the md5 message digest would take an unrealistic time to crack via brute force attack.
- 6. MD5 Completely Secure? It most definitely is a better algorithm than its predecessors, however, flaws(defects) do allow for exploits (utilise) to the system. Although it is likely that there are more than the two types of cracking techniques that I have been able to find, I shall only discuss the two most widely known.
- 7. Possible Techniques • Brute Force (easiest, but success low) • A brute force attack simply tries all possible combinations, until it finds the correct solution. • Collision Checking (harder to implement) • Collision checking is the attempt to find two different inputs to the md5 algorithm which create the same generated hash.
- 8. Uses of MD5 Encryption • Digital Signatures (Authentication) • Certificates • One-Way Encryption • Secure storage of information that does not need to be deciphered.
- 9. Digital Signatures Possibly the best reason for having an md5 algorithm is for the use of digital signatures. They allow other people to digitally verify that whatever document they received is actually authentic and not tampered with. Couldn’t find any free software to create digital signatures, or source code to hardcode it into any language. Therefore I can’t show any examples of digital signatures or certificates in use.
- 10. Collisions As Security Hazard Collisions are the main hazard when dealing with the md5 algorithm, as collisions, or two files that produce the same hash signature. To verify a document, a md5 hash of the file is created and sent along with the document as a certificate. When the other user receives the file, it is certified to either be the original, or a tampered with document. This is done by hashing the file again upon arrival, and comparing the two hash signatures. If they match, the document is said to be authentic.
- 11. Therefore, if someone were to be able to create another document with completely different content, but producing the same hash signature, it would still be said to be authentic.
- 12. Pros/Cons MD5 • Easy to use • Widely used • Considered secure • Difficult to crack • Is susceptible to brute force attacks • Hash collisions is a known flaw • Quantum computers would make such an algorithm worthless
Editor's Notes
- #13: http://www.fastsum.com/rfc1321.php