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Update crypto.md

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formatting fixes.
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vin01 2017-10-17 14:04:51 +05:30 committed by GitHub
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cheatsheets/crypto.md
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@ -50,9 +50,9 @@
**Length extension attack**
In cryptography and computer security, a length extension attack is a type of attack where an attacker can use `Hash(message1)` and the length of message1 to calculate `Hash(message1 ∥ message2)` for an attacker-controlled message2.
In cryptography and computer security, a length extension attack is a type of attack where an attacker can use `Hash(message1)` and the length of `message1` to calculate `Hash(message1 ∥ message2)` for an attacker-controlled `message2`.
TL;DR: given a hash that is composed of a string with an unknown prefix, an attacker can append to the string and produce a new hash that still has the unknown prefix.
In Summary: Given a hash that is composed of a string with an unknown prefix, an attacker can append to the string and produce a new hash that still has the unknown prefix.
An example:
@ -67,7 +67,7 @@ http://example.com/download?file=report.pdf%80%00%00%00%00%00%00%00%00%00%00%00%
%00%00%A8/../../../../../../../etc/passwd&mac=ee40aa8ec0cfafb7e2ec4de20943b673968857a5
```
A related H1 report: https://hackerone.com/reports/251572
A related HackerOne report: https://hackerone.com/reports/251572
Tool to extend a hash: https://github.com/iagox86/hash_extender