Hashing
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Third presentation of Mike Dance's Cryptography series, it provides a first look into hashing. Mike Dance is a web developer and Bitcoin advocate. ---------- Also presented at the BitcoinSYD Meetup on 18 February 2015
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APIs present enterprises with many business opportunities but they also create new attack vectors that hackers can potentially exploit. APIs share many of the same threats that plague the Web but APIs are fundamentally different from Web sites and have an entirely unique risk profile that must be addressed.
By adopting a secure API architecture from the beginning, it is possible to address both old and new threats. In this webinar, Scott Morrison – CTO at Layer 7 Technologies – will explain in detail how an enterprise can pursue its API publishing strategy without compromising the security of its on-premise systems and data.
You Will Learn
How APIs increase the attack surface
What key types of risk are introduced by APIs
How enterprises can mitigate each of these risks
Why it is crucial to separate API implementation and security into distinct tiers
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Scott Morrison, CTO, Layer 7 Technologies
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Hashing
- 2. What is a hash?
- 3. – Wikipedia A hash function is used to map digital data of an arbitrary size to digital data of a fixed size, with slight differences in input data producing very big differences in output data.
- 5. A hash function provides a concise fingerprint for data that is easily verified, and easy to spot if the data has been tampered.
- 6. What are the properties of a good hash function?
- 7. Arbitrary Input Length Ideally, we should be able to hash anything we want: an email, document, movie, etc.
- 8. Fixed Output Length The output of the hash function should be small so it is efficient to send, and differences can be easily detected.
- 9. One Way Function You should not be able to determine the hash input, from the output.
- 10. The Avalanche Effect A small change to the input, should have a large effect on the output to make tampering easy to detect.
- 11. password vs Password Simply uppercasing the P on password results in a completely different hash.
- 12. Collision Resistance The probability of generating the same hash output should be computationally impractical.
- 13. Real World Applications • Password Storage And Verification • Source Code/Software Verification
- 14. Password Storage And Verification Instead of storing your actual password, websites will store the hash of your password
- 15. Why?
- 16. How many of you use the same password for multiple websites?
- 17. Prevents system administrators, and hackers from being able to view your password if they gain access to the database.
- 19. Passwords are stored in plaintext
- 20. The hashed version of the password is stored
- 21. Source Code/Software Verification Using hashes and public key cryptography digital signatures we can quickly verify that source code and software has not been tampered with.
- 23. Original
- 24. Original Hash
- 25. Backdoor
- 26. Backdoor Hash
- 27. The original and backdoor hashes are completely different!
- 28. GIT GIT is the most popular version control software used to track source code changes throughout a project.
- 29. A git source code repository computes hashes of each file, directory structure, and commit details to ensure source code integrity.
- 31. Hash
- 32. Bitcoin Armory Bitcoin technology allows a person to hold their entire life savings in software. With this in mind, the ability to verify that software we download hasn’t been tampered with becomes critically important.
- 33. File
- 34. File This is the file we want to verify. It could be an email, software, document, movie, etc.
- 35. Signed Hash File
- 36. Signed Hash File Contains the signed message and the message signature that will be verified against the software vendors signing key. In this example, the message contains the hash of the file we want to verify, and the filename.
- 38. Message
- 39. Hash
- 40. Filename
- 42. Signing Key
- 43. Signing Key Contains the software vendors public key used to verify that the signed message is authentic, and has not been tampered with. This can be downloaded from the software vendors website, or from a centralised key server.
- 46. 1. Verify the signed hash file is authentic
- 48. Command
- 49. Good Signature
- 50. 2. Verify the files hash matches the hash in the signed hash file.
- 52. Signed File Hash
- 53. File Hash
- 54. The signed file hash and our file hash match!
- 55. Questions?
- 56. Further Reading • Hash function wikipedia definition • http://en.wikipedia.org/wiki/Hash_function • GPG-Verifying Armory Installers • https://bitcoinarmory.com/download/ • Brainwallet • http://brainwallet.org