By: Shay Amosi & Jasmin Amitai Mentor: Mony Orbach Spring 2013. Encryption/Decryption system Midterm Presentation. Our project. Our project goal i s to create a hardware system that encrypts the data quickly and efficiently.
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By: Shay Amosi & JasminAmitai Mentor: MonyOrbach Spring 2013 Encryption/Decryption systemMidterm Presentation
Our project • Our project goal is to create a hardware system that encrypts the data quickly and efficiently. • The system will simulate real-time encryption between a PC and USB using FPGA.
Twofish • The Twofish is a symmetric key 128-bit Block Feistel network. • Twofish can work with variable key length from 128 to 256 bits. • Twofishexhibits fast and versatile performance across most platforms. • The Twofish structure offers a great deal of flexibility in terms of space versus speed tradeoffs.
The Twofishalgorithn The TwofishConsists of the following steps: • The plaintext is split into 4 words • Input Whitening • 16 rounds of the F function • Output Whitening
Implementation methods • Pipeline: Good choice when it comes to performance, best for pipes that contain pure logic flow without too many stalls resulting from control lines. Requires the use of many resources. • Iterative: Good choice when it comes to cost reduction, best when we are not required to meet high performance. • Combining both: Good choice when we want to achieve the optimal performance under resource constraints, yet the implementation is more complex. f f f f f f f
Pipeline is our choice! Since the goal of our project as we have defined earlier is a high-performances, and the core of our hardware performs many serial permutations and logic calculations, the right choice is to pipe our computational unit. During the project we will have to match the dimensions of our design to the FPGA’s size.
TOP LEVEL SCHEME SRAM Keys ROM Fifo in Twofish Fifo out Twofish control
TWOFISH ALGORITHEM DATA IN f f DATA OUT PHT PHT H H X 16 H H
Hardware environment FPGA TWOFISH FIFO IN FIFO OUT CTRL
Hardware Test • Phase #1: Defining a set of unique inputs as the test blocks to be encrypted and save the plaintext in a separate file. • Phase #2: Encrypt the set of inputs (henceforth- Twofished blocks). • Phase #3: Save the ciphered text in a separate file and compare it with the expected output. (This comparison is necessary to verify the correctness of the encryption and avoid possible double errors) • Phase #4: Decrypt the Twofished blocks and compare it to the initial test blocks via automated script.
Hardware Test (Phase #1-3) PLAINTEXT FPGA PHASE #1 256KB TWOFISH FIFO IN 256KB FIFO OUT PHASE #2 CTRL CIPHERTEXT PHASE #3
Hardware Test (Phase #4) CIPHERTEXT FPGA 256KB Comparison TWOFISH FIFO IN 256KB FIFO OUT PHASE #4 CTRL PLAINTEXT ????????