The document presents a security analysis of the FBDK (Fixed Block with Dynamic Key Size) block cipher, a new cryptographic technique specifically designed for digital images, which addresses the shortcomings of traditional algorithms like AES and DES. The paper evaluates the algorithm's resistance against various attacks, including brute-force, statistical, and differential analyses, demonstrating its effectiveness and security through experimental results. Overall, the findings indicate that FBDK is a viable option for real-time secure transmission of digital images due to its high encryption quality and low vulnerability to attacks.