implementation of rsa algorithm for speech data encryption and decryption
DESCRIPTION
An efficient implementation of RSA algorithm for speech data encryption and decryption. At first, five hundred Bangla speech words were recorded from six different speaker and stored as RIFF (.wav) file format. Then our developed program was used to extract data from these words and this data were stored in a text file as integer data. Finally, we used our implemented program to encrypt and decrypt speech data.TRANSCRIPT
Md. Ariful HoqueRoll No: MSc 140202Discipline : CSEKhulna University
Data communication.
Vital role of Cryptography.
Phone communication.
E-commerce.
Pay-TV.
Transmitting financial information.
Video Conferencing.
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Cryptosystem.Encryption
Decryption
Symmetric cryptosystem.
RSA cryptographic algorithm.
Uses a pair of related keys -Private key
Public key
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Record 500 Bangla speech words.
Extract data.
Stored in a text file as integer data.
Encrypt and decrypt.
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Speech Word
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Recording of Bangla speech words.
Recorded as wav file.
Sampling rate 8.00 KHz.
Coded in 8 bits PCM.
Speech Word
Preprocessing and Data Extraction
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Discard 58 bytes from beginning.
Extract require voiced data.
Contain silence, unvoiced and voice.
Stored in a text file.
Speech Word
Preprocessing and Data Extraction
Public key {e, n}
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Speech Word
Preprocessing and Data Extraction
Encryption Process
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Public key {e, n}
Speech Word
Preprocessing and Data Extraction
Encryption Process
Private key {d, n}
Public key {e, n}
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Speech Word
Preprocessing and Data Extraction
Encryption Process
Decryption Process
Public key {e, n}
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Private key {d, n}
Speech Word
Preprocessing and Data Extraction
Encryption Process
Decryption Process
Original Speech Word
Private key {d, n}
Public key {e, n}
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Random Number Generator
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Random Number Generator
Rand FIFO
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Random Number Generator
Rand FIFO
PrimalityTester
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Random Number Generator
Rand FIFO
PrimalityTester
Prime FIFO
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Random Number Generator
Rand FIFO
PrimalityTester
Prime FIFO
N=p*q∅(n)=(p-1)(q-1)
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Random Number Generator
Rand FIFO
PrimalityTester
Prime FIFO
N=p*q∅(n)=(p-1)(q-1)
n
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Random Number Generator
Rand FIFO
PrimalityTester
Prime FIFO
N=p*q∅(n)=(p-1)(q-1)
gcd(e, ∅(n))=11<e< ∅(n)
n
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Random Number Generator
Rand FIFO
PrimalityTester
Prime FIFO
N=p*q∅(n)=(p-1)(q-1)
gcd(e, ∅(n))=11<e< ∅(n)
e n
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Random Number Generator
Rand FIFO
PrimalityTester
Prime FIFO
N=p*q∅(n)=(p-1)(q-1)
gcd(e, ∅(n))=11<e< ∅(n)
e.d =1mod ∅(n0 ≤d ≤n
e n
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Random Number Generator
Rand FIFO
PrimalityTester
Prime FIFO
N=p*q∅(n)=(p-1)(q-1)
gcd(e, ∅(n))=11<e< ∅(n)
e.d =1mod ∅(n0 ≤d ≤n
d e n
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e n Public key
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d
e n
n
Public key
Private key
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M
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M
e
n
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M
e
n
Modular Exponentiation Me mod n
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M
e
n
CModular Exponentiation Me mod n
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C
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C
d
n
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C
d
n
Modular Exponentiation Cd mod n
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C
d
n
MModular Exponentiation Cd mod n
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Input: A, B, n Output: E = AB mod n
LR binary method
E <= 1; for i = k-1 to 0
If Bi =1E <= A*E mod nend if
if i ≠ 0 E <= E*E mod n; end if
end for return E;
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Objective.
500 speech words recorded.
Saved as .wav format.
Extracted integer data.
Taken txt file as input.
Produce unreadable message.
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RSA algorithm used to encrypt and decrypt.
M lies in the range .
Encrypt 500 word at a time.
Limitations.
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Thanks To All
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