IJSRP JUNE 2012 Online Print Version - IJSRP.ORG

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International Journal of Scientific and Research Publications, Volume 2, Issue 6, June 2012 21 ISSN 2250-3153 www.ijsrp.org
International Journal of Scientific and Research Publications, Volume 2, Issue 6, June 2012 22 ISSN 2250-3153 IV. PROPOSED ALGORITHM PROCESS Encryption Algorithm 1. Generate N number of 8-bit Alphanumeric Characters randomly. 2. Randomly select any one among them, denoted as ‗A‘, and 5- bit SECRET KEY assigned as ‗B‘. 3. Convert ‗A‘ and ‗B‘ in binary format. 4. Compute the quotient of these two Q=A/B. 5. Perform XOR operation with Message ‗M‘ and quotient ‗Q‘, TEXT = M XOR Q. 6. Scanned TEXT and perform the Bit-Stuffing as per flowchart. 7. In this way we get the encrypted message as CIPHERTEXT. Decryption Algorithm 1. Remove the extra bit from CIPHERTEXT. 2. Perform the XOR operation with ‗TEXT‘ and quotient ‗Q‘. 3. In this way we get the original message ‗M‘. V. WORKING EXAMPLE Encryption: 1. Input: Public Key as ‗A‘=SCSE04, Secret Key as ‗B‘=VIT and Message as ‗M‘=11MSC 2. Conversion to binary format: Message as M=11MSC [1=0000001, 1=0000001, M=1001101, S=1010011, C=1000011] M=00000010000001100110110100111000011 (11MSC) Public key A= SCSE04 [S=1010011, C = 1000011, S= 1010011, E=1000101, 0= 0000000, 4= 0000100] A= 101001110000111010011100010100000000000100 (SCSE04) Secret key B=VIT [V=1010110, I=1001001, T=1010100] B=101011010010011010100 (VIT) 3. Quotient ‗Q‘; Q=A/B=111101101111110110001 4. TEXT = M XOR Q. TEXT=100000010110110110110011. 5. CIPHERTEXT = TEXT with Bit-stuffing using SECRET KEY, (Case: 2) CIPHERTEXT = 100000010111011001110110001111010010011010100 [Encrypted Message (CIPHERTEXT) = 100000010111011001110110001111010010011010100] Decryption: It is just reverse of encryption. 1. Input as CIPHERTEXT = 100000010111011001110110001111010010011010100 Case 1: Remove the bit after 111 patterns and concatenate. Removed bits =001010010011010100 Comparison of removed bits with SECRET KEY bits, here mismatched, so break and go to next case. Case 2: Remove the bit after 11 patterns and concatenate. Removed bits=101011010010011010100 Comparison of removed bit with SECRET KEY bits, here it matched, so go to next phase. 2. Performing XOR operation with TEXT and Quotient. In this manner we get the original message. Message M = 00000010000001100110110100111000011 (11MSC) VI. CONCLUSION Overall RSA, DES and IDEA are very strong encrypting algorithms in existence, they do have their weaknesses: RSA contains lengthy and complex computations, while the purpose of initial and final permutation is not clear in DES algorithm, whereas IDEA uses a single and lengthy key. By combining the concept of above mentioned algorithms, our proposed algorithm uses the strength of these two algorithms to in order to reduce the weaknesses. As the result, our proposed cipher algorithm is one of the strongest, simplest and fastest encryption algorithms. REFERENCES [1] S.C. Coutinho,University Press (India) Private Limited (2003).The Mathematics of Ciphers ,Number Theory and RSA Cryptography. Department of Computer science Federal University of Rio de Janeiro Rio de Janerio, Brazil [2] Evolution of Cryptography Mohd Zaid Waqiyuddin Mohd Zulkifli, Evolution of Cryptography, 17th January 2007. [3] Data Encryption and Decryption process Using Bit Shifting and Stuffing (BSS) Methodology, B.Ravi Kumar et al. / International Journal on Computer Science and Engineering (IJCSE). [4] Wikipedia, The Free Encyclopedia, from http://en.wikipedia.org/wiki/RSA [5] Wikipedia, the Free Encyclopedia, from [6] http://en.wikipedia.org/wiki/International_Data_Encryption_Algorithm [7] Wikipedia, The Free Encyclopedia, from http://en.wikipedia.org/wiki/Data_Encryption_Standard [8] CareerRide.com, from http://www.careerride.com/Networking-DESweakness-and-strength.aspx AUTHORS First Author – Sudhakar Kumar Singh, M.SC (Computer Science), VIT University Vellore, Sksingh2012@yahoo.com. Second Author – Hariom Kumar, M.SC (Computer Science) Third Author – K Praveen Kumar, M.SC (Computer Science) Fourth Author – K Ramesh Babu, Faculty of VIT University. Vellore. www.ijsrp.org
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