This document discusses the design and implementation of the Blowfish encryption algorithm using Verilog HDL. Blowfish is a symmetric block cipher that uses a variable-length key from 32 to 448 bits, making it suitable for securing data. The algorithm consists of two parts - key expansion and a round structure involving 16 rounds of operations. The authors implemented Blowfish using Verilog HDL on a Xilinx FPGA for applications requiring encryption like IoT devices. Their design achieved high-speed encryption of up to 4 bits per clock cycle and operated at a maximum frequency of 50MHz.

1. Design and Implementation of
Blowfish Algorithm based on Verilog HDL
UNDER THE GUIDANCE OF
T.SHIRISHA
(Assistant professor)
PRESENTED BY
N.AJAY (15845A0402)
T.SATHISH (15845A0403)
P.GOVARDHAN (14841A0485)

2. INTRODUCTION
 Information security has become an important issue in data
communication. encryption algorithms have come up as a
solution and play an important role in information security
system.
 Blowfish is a symmetric block cipher that can be effectively
used for encryption and safeguarding of data. it takes a
variable-length key, from 32 bits to 448 bits, making it ideal
for securing data.

3.  Blowfish is based on “CRYPTOGRAPHY” mechanism
 Where cryptography is a greek word it means
crypto = hidden
graphy= way of writing

4. Encryption is the process of converting plane text to
“cipher text”
Cipher text is an encrypted information which is
unreadable by a human or computer without the
proper cipher to decrypt it
ENCRYPTION
Cipher text ?

5. ENCRYPTION
STANDARDS
1. DATA ENCRYPTION STANDARD (DES)
2. ADVANCED ENCRYPTION STANDARD (AES)
3. “BLOWFISH” ALGORITHM

6. 1. DES
 DES is having plaintext range of 64bit and key length
of 56 bit.
2. AES
 AES is having plain text range of 128 bit and variable key
length of between 128,192,256

7. 3. BLOWFISH ALGORITHM
The blowfish algorithm is having plaintext range of 128 bit and
variable key length from 32 bits to 448 bits and it performs 16
rounds of operations.

8. Structure
of
Blowfish
algorithm
There are two
parts in this
algorithm
1. KEY
EXPANSION
2. ROUND
STRUCTURE

9. WORKING OF
KEY EXPANSION
32
64
32 32

10. WORKING OF ROUND
STRUCTURE
64
32 32
32
ROUND 1
ROUND 2
ROUND 16

11. IT USES SYMMETRIC KEY

12. ENCRYPTION AND DECRYPTION

13. ADVANTAGES
LICENSE FREE
MORE SECURE
IMPROVED PERFORMANCE
LESS POWER CONSUMPTION
SMALLER DESIGN SIZE
AT A TIME ENCRYPTION AND DECRYPTION
CAN BE PERFORMED

14. APPLICATIONS
Widely used for computer and
communication network.
Android devices
IOT(Inter net of things)
Image processing units

15. Software Used:
 XILINX 14.7
Language Used:
• VERILOG HDL

16. TIMING DIAGRAM

17. CONCLUSION
 The Blowfish algorithm can achieve high-speed data transfer up to
4 bits per clock, which is 9 times faster than a Pentium.
 The test results show that the maximum frequency of this
Blowfish cipher chip is 50MHz.
 The proposed architecture has satisfied the need of high-speed
data transfer and can be applied to security device