March 2016
Intermediate to advanced
312 pages
7h 15m
English
Content preview from Mobile Application Penetration TestingBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Encryption and decryption on the client side
Developers are often forced to create custom encryption methods due to various reasons, such as performance and efficiency issues. Broken cryptography happens mainly due to the following three reasons:
- Using a weak, custom, or known algorithm (RC4, MD4, MD5, SHA1) that has been proven to be vulnerable for the encryption and decryption process
- Poorly implementing strong algorithms
- The key management process being flawed
In this section, let's go ahead and explore the insecure usage of custom encryption and its implementation. Since we downloaded the app Herd Financials, let's convert the .apk file into a .jar file using dex2jar, as shown in the following code snippet:
C:\Hackbox\A-Tools\dex2jar-2.0>d2j-dex2jar.bat ...Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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