From the course: Ethical Hacking: Mobile Devices and Platforms
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Watching for bad cryptography - iOS Tutorial
From the course: Ethical Hacking: Mobile Devices and Platforms
Watching for bad cryptography
- [Instructor] Let's click on BrokenCrypto and we get the BrokenCrypto lesson with three BrokenCrypto challenges and we'll select the lesson. Okay, we get a series of messages. When we double click on a message, the app pops up an option for us to select all and to copy. But before we do anything more, let's examine the messages. We can see that they have the value 20 occurring quite frequently and that's the hex value of a space. When we look at the first message, which starts 48656C6C6F2C20, we can see this looks very much like just a hexadecimal representation of the plain text message. There's plenty of ASCII charts available online and here's one we can use. The first part of the message decodes to hello. So all we have to do is use our ASCII chart to recover the messages, character by character. If we decode further, we find the first message starts with hello, how are you? We are holding a competition. We…
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