A complete cryptosystem developed by me. Works for all kinds of files. Takes very low space and can also be embedded to be used in any kind of devices.

3. 21st Century is a digital age where need for computers is paramount.
From education and research to infrastructure and defence, the use of
computers has eventually spread into everything. Every day billions of
bits of data are being passed from one end of the world to other. With
this volume of data being transferred from one place to other, the need
for securing the data has become paramount. This is where the role of
Cryptography and Information Security plays an important part.
The Secure Encryption Technique (SET) brings about such an algorithm
which depends completely upon the design and the form of the Key used
by the user to encrypt the message. The more complex the key becomes,
the more difficult the cipher text becomes to analyse. According to the
test results prepared from the testing between the plain text files and
the cipher text files, SET has given approximately 25% better results in
terms of Chi-Square values and Encryption--Decryption Time.

5.  In cryptography, a cipher (or cypher) is an algorithm
for performing encryption or decryption—a series of
well-defined steps that can be followed as a
procedure.
 Cipher text is also known as encrypted or encoded
information because it contains a form of the
original plaintext that is unreadable by a human or
computer without the proper cipher to decrypt
it. Decryption, the inverse of encryption, is the
process of turning cipher text into readable plaintext.

6.  When same key is used to encrypt and
decrypt the message it is called Symmetric
Cipher.
 The keys may be identical or there may be a
simple transformation to go between the
two keys.

7.  Asymmetric Encryption is a form of Encryption where
keys come in pairs. What one key encrypts, only the
other can decrypt.
 In Asymmetric Cryptography two different types of
keys are used for encryption and decryption. One is
public key and another one is private key.

8. There are two types of
keys:
 Public Key
 Private Key

9.  The Public Key is what its name suggests - Public. It is
made available to everyone via a publicly accessible
repository or directory.
 On the other hand, the Private Key must remain
confidential to its respective owner.
Because the key pair is mathematically related,
whatever is encrypted with a Public Key may only be
decrypted by its corresponding Private Key and vice
versa.

10.  The Secure Encryption Technique (SET) is a Private Key
Block Cipher Cryptosystem which has been modified on
the platform of Triple SV.
 This cryptosystem inherits its basic architecture and
function from TSV and then it has been developed
further to provide better security with the ease of use
for even the basic requirements of encryption system.
 The key is a 27 bit (128 bit) key and the encryption is
based completely on the key provided .
Key words: TSV, Private Key Cryptosystem, Block Cipher.

11.  The Triple SV is a block cipher that uses secret
key encryption.
 This algorithm (SET) takes a fixed-length
string of plaintext bits and transforms it
through a series of complicated operations
into another cipher-text bit string of the
same length.
 The proposed block size is 256 bits. The key
comprises 128 bits .

12.  At the end of the encryption operation, the
result will be a cipher-text of the same
number of bits as the plain-text in a file of
designated type.
 The encryption is based on 2^7 (128) times,
i.e. the encryption has 7 levels with each level
containing the operations of encryption or
decryption.

13.  The key, i.e. Private Key is generated with the help
of a passcode accepted from the user as input. In
this case the passcode has been restricted to 7
characters only.
 The key is stored in a file of designated type in
respective archives.
 It can be shared after being encrypted with light
encryption algorithms like RSA, SHA, etc.

14. Algorithm of SET during Encryption
The encryption
levels include
three levels:
 Near swapping,
 Far swapping
and
 Bitwise XOR
operation.

15. Algorithm of SET during Decryption

16. n-bit Near Swapping Operation
 The Near Swapping is another protocol where the string of
data is swapped on a running pair basis.
 The first set of pair would include a swap between the first two
(i.e. 1st and 2nd)bits.
 The next swap would be between the next pair of bits (i.e.
3rd and 4th) bits and so on till the nth bit is swapped with (n-1)th
bit.
 The resultant array would have a jumbled up set of Messages.

17. n-bit Far Swapping Operation
 The Far Swapping is a simple substitution protocol whereby
the furthest of the bits in an array are swapped.
 This means in an array of n bits, the 1st and the nth bit will be
swapped in the first iteration and so on till n/2 bits. At the end
of the entire operation, the initial string would be reversed.
 This operation will be performed till the counter reaches n/2th
bit.

18.  The bitwise XOR operation is performed after the near
swapping stage . This protocol requires the use of a bit of
the key. For each level, a bit of the key is selected and the
XOR operation is performed with each character of the data
string.
 The result of the
operation will be stored
in the same array. The
operation is repeated
the number of times as
the quantity of the level.
n-bit Encryption Stages

19.  The key is the second most important part of
this encryption technique.
 It is taken from the user as an input. After
encryption, this key is stored in binary form in
a .dll file.
 This key can be shared after using light
encryption like RSA, SHA,

20.  Symmetric Key Distribution Using
Symmetric Encryption.
 Symmetric Key Distribution Using
Asymmetric Encryption.

21. A way to analyse the technique is to test
the non-homogeneity of the source and
encrypted file .
 The Chi-Square test has been performed
for this purpose. The results are compared
to some of the most popular encryption
techniques.

22. Comparison of Chi-Square Values of ROBAST, RSA,TMAT, TMAT, TPRT, SRAT, TSV, SET

23.  The encryption time is the time required to
convert a plaintext into a cipher text .
 The SET being on the same platform as that of
the TSV (Triple SV), has similar characteristics;
however, on further evaluation, it was found
that the SET has lower encryption time than
that of TSV.

24. Encryption Time of ROBAST, RSA, TMAT, TPRT, SRAT, TSV, SET

25.  The decryption time is the time required to convert a
cipher text into a plaintext .
 The SET being on the same platform as that of the TSV
(Triple SV), has similar characteristics; however, on
further evaluation, it was found that the SET has slightly
higher decryption time than that of TSV.
 The main difference in the decryption sequence
between TSV and the SET remains is the presence of
unique and user key based initialization vector.

26. Decryption Time of ROBAST, RSA, TMAT,, TPRT, SRAT, TSV, SET

27.  The Avalanche Ratio test is perhaps the most
comprehensive test when it comes to analysis of a
Cryptographic Algorithm.
 The Avalanche Test is the ratio of difference
between the simple encrypted file and one bit
modified source key/file.
 The Avalanche Ratio is the key of measure of
cryptanalysis. In general terms, it is the measure
that in what extent the characters/bits in the
encrypted file will differ if we modify some
characters/bits in the source file or in the session
key.

28. 0
50
100
1 3 5 7 9
AvalanceRatioValues
File Number
Avalanche Ratio
ROBAST
RSA
TPRT
TMAT
SRAT
TSV
SET
Chart comparing the Avalanche Ratio values of
ROBAST, RSA, TPRT, TMAT, SRAT, TSV and SET

29.  Thus, the SET is a symmetric block cipher using a 256-bit
block and 128-bit key.
 From the above stated facts, it can be inferred that SET is a
promising new cryptosystem which can be used in various
fields such as tele-communications, data security, cloud
computing, etc.
 The 128-bit standard encryption key length along with its
Avalanche Ratio makes it safe against brute force attacks.
Even the time complexity of this algorithm is proved to be
better than the existing major cryptosystems such as RSA
and TMAT.