Category Archives: cryptography

Polymorphic Mutex Names

Introduction Perhaps there was never any legitimate reason to use Polymorphic Mutex Names, so it’s understandable many developers never provided a solution. It could be argued, poly mutexes serve only as a way for malicious applications to evade detection. On … Continue reading

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Emulation of AESENC and AESENCLAST instructions in x86 assembly

Introduction aesenc and aesenclast are AES-NI instructions impelemented on the x86 architecture. Recently, a well known cryptographer J.P Aumasson published code to emulate these instructions in C, which would be very useful for emulators, and virtual machines in general. The … Continue reading

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WanaCryptor File Encryption and Decryption

Introduction This is a quick post about the WanaCryptor ransomware wreaking havoc on many networks across the world this weekend. With all the news coverage, most of you already know the trouble caused by it. Once executed on a system, … Continue reading

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Shellcode: A Windows PIC using RSA-2048 key exchange, AES-256, SHA-3

Introduction This won’t be a tutorial on writing shellcode although you might glean something useful from the source code when writing your own PIC in C. This is a PIC (Position Independent Code) for the Windows Operating System written in … Continue reading

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