Entropy Analysis
Entropy analysis is a common technique for determining whether data is encrypted or compressed. It evaluates data randomness by computing the Shannon entropy of a byte stream.
Timeline (last 90 days)
The author used an entropy analysis tool to examine the extracted Dell firmware image, found edge entropy values as high as 0.96, and inferred from this that the firmware was encrypted.
In entropy analysis, plaintext code and structured data usually have entropy values of about 0.5-0.7, while encrypted or highly compressed data has entropy values close to 0.95 or above.
All Facts (2)
The author used an entropy analysis tool to examine the extracted Dell firmware image, found edge entropy values as high as 0.96, and inferred from this that the firmware was encrypted.
50%UnverifiedIn entropy analysis, plaintext code and structured data usually have entropy values of about 0.5-0.7, while encrypted or highly compressed data has entropy values close to 0.95 or above.
50%