This document proposes a new encryption algorithm called Byte Rotation Encryption Algorithm (BREA). BREA is a symmetric key, block cipher that encrypts fixed-length blocks of 16 bytes using byte rotation and a randomly generated 16 byte key matrix. It employs a multithreading model to encrypt blocks in parallel, improving encryption speed. The algorithm assigns numbers 1-26 to letters, adds the plaintext and key matrices, then rotates rows and columns before replacing values with letters to generate the ciphertext. BREA is designed to be faster and require fewer resources than previous algorithms while still providing secure encryption.

1. A new approach towards
encryption schemes:
Byte- Rotation encryption
algorithm
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2. Contents
 What is BREA?
 Previous used encryption algorithms
 BREA Algorithm
 Steps
 Example
 BREA with parallel encryption model
 Byte rotation with “CBC encryption algorithm”
 Advantages
 Future enchancement
 Conclusion
 Refrences
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3. What is BREA?
oByte Rotation Encryption algorithm(BREA)
(developed in 2012) is a symmetric key block
cipher algorithm which is applied on different
blocks of plaintext and executes in parallel
manner through multithreading concept of
single processor system.
oMultithreading is a technique at which a single
set of code can be used by different processors
at different stages of execution.
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4. Previous used algorithms
oEarlier many researchers have proposed
various encryption algorithms such as AED,DES,
Triple DES,RSA, Blowfish etc.
oSome of them are most popular in achieving
data security at a great exent like AES and
Blowfish.
oWith increase in security level, the time and
complexity of algorithm is also increased and
this is the major cause of decreasing the speed
and efficiency of encryption system.
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BREA
Symmetric Key
Algorithm
Block Cipher
Encryption

6. Byte Rotation Encryption
Algorithm
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It is symmetric key block cipher
algorithm
Each block size of 16 bytes
Size of Matrix is 16 bytes
Value of matrix are randomly selected
and are ranging from 1-26
Mono alphabetic substitution concept is
followed
Byte rotation technique is used

7. Steps
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1. The letters of the alphabet are assigned numerical
values from 1 to 26 in sequence i.e. A,B,C,D,…,Y,Z
assigned numerical values 1,2,3,….26 respectively.
2. The plaintext is partitioned into fixed-length
blocks of size 16 bytes (128 bits) each. These
blocks are represented by a matrix Mp.
3. The values of key matrix (K) are randomly selected
from the range 1 to 26. The size of key matrix is
equivalent to the block size of plaintext i.e. 16
bytes. K=[K1,K2,K3,………….K16].
4. Calculate the transpose matrix of plaintext block
matrix (MP), which is denoted by (MP)T.

8. Continue…
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5. Calculate the encrypted key matrix Ke using the
following formula:
Ke = K mod 2
6. Add both the matrices MPT and Ke and the resultant
matrix is denoted by CPK.
CPK = MPT + Ke
7. Rotate the first three rows horizontally of CPK matrix
such that rotate one byte from first row, rotate two
bytes from second row, rotate three bytes from third
row and fourth remains unchanged. The resultant
matrix is denoted by Chr.
8. Rotate first three columns vertically of Chr matrix such
that rotate one byte from first column, rotate two
bytes from second column, rotate three bytes from
third column and fourth column remains unchanged.
The resultant matrix is denoted by CVR.

9. Continue ….
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9. Replace numeric values of CVR matrix by their
corresponding letters and if 36 exist in CVR matrix, it
is replaced by special character #. The resultant
matrix is denoted by Ce.

10. EXPLANATION(1)
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11. EXPLANATION(2)
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12. FLOWCHART
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13. Byte rotation with “CBC encryption
algorithm”
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Advantages
Very
Secure
Require
less
computer
resources
No
complex
calculation
Very Fast

15. Future Enhancement
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• The system can be easily modified to
accept any encryption algorithm which
would be framed in future.
• Moreover, currently concentration on the
next work which adopts Parallelism
through multiprocessor system where
various encryption algorithms can run in
parallel environment which enhances the
performance and speed of
Encryption/Decryption process.

16. Conclusion
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• The concept of block wise parallel
encryption using multithreading
technique enhances the speed of
encryption system. The system which use
“BREA” provides enough security. Thus
the system is justified for its use in
securing files.

17. References
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• [1] MAHENDRAN R “BYTE ROTATION WITH CBC
ENCRYPTION ALGORITHM” International Journal
of Machine and Construction Engineering
Volume 1 Issue 1 Aug 2014.
• [2] Nidhi Gouttam “Implementation Of
Simulation Of Byte Rotation Encryption
Algorithm” INTERNATIONAL JOURNAL OF
TECHNOLOGY ENHANCEMENTS AND EMERGING
ENGINEERING RESEARCH, VOL 2, ISSUE 5 ISSN
2347-4289
• [3] Sunita Bhatti & Prof. S. K. Sharma, “Block
Wise Parallel Encryption through Multithreading
Concept”, Research Paper published in
Aishwarya Research Communication Journal
(ISSN: 0975-3613) Vol. 3, August 2011.

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