Malware and cryptography 27: encrypt/decrypt files via A5/1. Simple C/C++ example

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Hello, cybersecurity enthusiasts and white hackers!

In one of the previous posts I wrote about the A5/1 GSM encryption algorithm and how it affected the VirusTotal detection score.

At the moment of my current research on ransomware simulation, I decided to show file encryption and decryption logic using the A5/1 algorithm.

practical example

First of all, our encryption and decryption functions are the same:

void a5_1_encrypt(unsigned char *key, int key_len, unsigned char *msg, int msg_len, unsigned char *out) { …

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