Implementation of Advanced Encryption Standard Algorithm with Key Length of 256 Bits for Preventing Data Loss in an Organization

Data and network security is one among the foremost necessary factors in today’s business world. In recent, businesses and firms like financial institutions, law firms, schools, health sectors, telecommunications, mining and a number of government agencies want a strategic security technique of managing its data. Organizations managing bigger monetary information, bio-data and alternative relevant info are losing its valuable information or data at rest, in usage or in motion to unauthorized parties or competitors as a result of activities of hackers. Organizations are losing millions of dollars as a result of unprotected data that gets into the hands of malicious persons. Data protection in an organization has become vital in today’s business. In order to possess secure information, this information should be protected in order that although malicious persons get access to the info, it becomes wealthless and useless to them. Advanced Encryption Standard (AES), could be a scientific discipline rule that may be used for secured data and communication in an organization, it uses same key that's isobilateral key for transmission additionally as reception. The AES rule is capable of using cryptographic keys of 128, 192, and 256 bits, this paper implement AES block cipher of 256-bits and 256-bit key size, developed with C# as a front-end client machine and MS SQL used for the database as a back-end machine.

Keywords: Cryptography; AES algorithm; Decryption; Encryption; Cipher; 256-bit-key

Source:https://www.longdom.org/

Download Full Paper

Implementation of 128, 192 & 256 bits Advanced Encryption Standard on Reconfigurable Logic

Implementation of 128, 192 & 256 bits Advanced Encryption Standard on Reconfigurable Logic

Monika Gupta1 , Swapnil Mahto 2 , Ambresh Patel 3

M.tech Scholar1, Assistant Professor 2, Assistant Professor 3

Sri Satya Sai College of Engineering Bhopal M.P. India

Abstract - Advanced encryption standard is adopted by NIST to replace data encryption standard, which was affected by several attacks. In this paper implementation of all three modes namely 128, 192 and 256 of advanced encryption standard is discussed for reconfigurable logic. All these modes are implemented using four design architectures namely: 2 stage sequential, 3 stage sequential , combinational and pipelined.

Keywords - Advanced encryption standard, Sequential, combinational, pipelined, encryption,

cryptography

Source:http://www.ijettjournal.org/

Download Full Paper

SMS ENCRYPTION USING AES ON ANDROID APPLICATION

Encryption is of great importance once the confidentiality of information is to be maintained over the network. SMS being one of the major means of data exchange among the mobile users.xSecurityxofxSMS is one of the major issues that must be handled during data transmission. So, by using Android technology an application has been developed by us which permits the sender to encode the messages before they are sent over the network. For the encryption and decryption process we have used Advanced Encryption Standard (AES) as the cryptographic algorithm. The application allows the user to input the key and the message which has to be encrypted and hence generate an encrypted message which can be decrypted by the receiver. The encrypted text so developed by the app is also resistant to Brute-Force attacks we have used AES.

Source: 122.252.232.85

Download Full paper

An Improved AES Cryptosystem Based Genetic Method on S-Box, With, 256 Key Sizes and 14 Rounds

An Improved AES Cryptosystem Based Genetic Method on S-Box, With, 256 Key Sizes and 14 Rounds

Ashutosh Pandey1

, Umesh Kumar Lilhore2

1 M.Tech Scholar, Dept. of CSE, NIIST Bhopal, India

2 NIIST Bhopal, A.P Dept. of CSE, NIIST Bhopal, India

Abstract— Cryptography methods are widely used in digital communication for secure data transactions. Cryptography methods have two categories symmetric and asymmetric. Both types of encrypting have their own importance and limitations. In Symmetric key-based encryption same key is used for encryption and decryption process. One of the most popular and widely used symmetric encryption methods is (AES) Advanced encryption standard, which attracts researchers to develop a more efficient AES cryptosystem. In this research work, we are presenting an improved AES encryption method “IAES”. The proposed IAES method uses a modified S-Box by employing a Genetic algorithm (GA) with a key size of 256 bit. In proposed method IAES, GA will be used in the S-box to perform various pipelined operations such as substitution, shifting of rows, mixing of a column and to perform Add Round Key in the AES rounds. In this work proposed IAES and existing AES method both are implemented over MATLAB simulator and various comparison parameters such as encryption time, speed and decryption time and speed are calculated. The high level of system integration along with high speed and high throughput makes the proposed IAES based cryptosystem a perfect choice for a spread of application.

Keywords— Cryptography, Symmetric, AES, S-box, Sbox, Genetic Algorithm

Source:https://media.neliti.com

Download Full Paper

[PAPER CRYPTOGRAPHY] AES Encryption and Decryption Using Direct3D 10 API

AES Encryption and Decryption Using Direct3D 10 API

Adrian Marius Chiuţă

Computer Science Department, IT&C Security Master

Cybernetics and Economic Informatics

Academy of Economic Studies

Calea Dorobanţilor, Nb. 15-17, Room 2315, Sector 1, Bucharest

ROMANIA

achiuta@tessera.com, http://ism.ase.ro

Abstract: Current video cards (GPUs – Graphics Processing Units) are very programmable have become much more powerful than the CPUs and they are very affordable. In this paper, we present an implementation for the AES algorithm using Direct3D 10 certified GPUs. The graphics API Direct3D 10 is the first version that allows the use of integer operations, making from the traditional GPUs (that works only with floating-point numbers), General Purpose GPUs that can be used for a large number of algorithms, including encryption. We present the performance of the symmetric key encryption algorithm – AES, on a middle-range GPU and on a middle-range quad-core CPU. On the testing system, the developed solution is almost 3 times faster on the GPU than on one single-core CPU, showing that the GPU can perform as an efficient cryptographic accelerator

Source:https://arxiv.org/
Download Full Paper

Secure Data Encryption Through a Combination of AES, RSA, and HMAC

Secure Data Encryption Through a Combination of AES, RSA, and HMAC

Eman Salim Ibrahim Harba

Computer Unit and Internet

College of Arts, University of Baghdad

Baghdad, Iraq

emanharba_121212@coart.uobaghdad.edu.iq

Abstract—Secure file transfer based upon well-designed file encryption and authorization systems expend considerable effort to protect passwords and other credentials from being stolen. Transferring and storing passwords in plaintext form leaves them at risk of exposure to attackers, eavesdroppers and spyware. To avoid such exposure, powerful encryption/authentication systems use various mechanisms to minimize the possibility that unencrypted credentials will be exposed, as well as be sure that any authentication data that does get transmitted and stored will be of minimal use to an attacker. In this paper, we proposed a method to protect data transferring by three hybrid encryption techniques: symmetric AES the algorithm used to encrypt files, asymmetric RSA used to encrypt AES password and HMAC to encrypt a symmetric password and/or data to ensure a secure transmitting between server-client or client-client from verifying in-between client and server and make it hard to attack by common attacked methods.

Keywords: Cryptography; Data Encryption; AES; RSA; HMAC

Source: https://www.etasr.com/

Download Full Paper

[PAPER CRYPTOGRAPHY ] Image encryption and decryption using AES algorithm

Image encryption and decryption using AES algorithm

Priya Deshmukh

Abstract— In today’s world data security is the major problem which is to face. In order to secure data during communication, data storage and transmission we use Advance encryption standard(AES). AES is a symmetric block cipher intended to replace DES for commercial applications.it uses 128-bit block size and a key size of 128, 192, or 256 bits. The AES algorithm is used to secure data from unauthorized user. The available AES algorithm is used for text data as well as for image data. In this paper an image is given as input to the AES encryption algorithm which gives encrypted output. This encrypted output is given as input to the AES decryption algorithm and the original image is regained as output. The AES algorithm for image encryption and decryption which synthesizes and simulated with the help of MATLAB software 

Index Terms— AES, cipher, DES, image encryption, image decryption, MATLAB

Source:https://www.ijser.org
Download Full Paper

[Paper Cryptography] Encryption and Decryption of Text using AES Algorithm

Encryption and Decryption of Text using AES Algorithm

Roshni Padate1

, Aamna Patel2

1Assistant Professor, Computer Engineering Department, Fr. Conceicao Rodrigues College of Engineering

2Electronics Department, Fr. Conceicao Rodrigues College of Engineering

Abstract— Data Security is the primary concern for every communication system. There are many ways to provide security to data that is being communicated. This paper describes a design of effective security for data communication by AES algorithm for encryption and decryption. The National Institute of Standards and Technology (NIST) has initiated a process to develop a Federal Information Processing Standard (FIPS) for the Advanced Encryption Standard (AES), specifying an

Advanced Encryption Algorithm to replace the Data Encryption Standard (DES) Expired in 1998. The Advanced Encryption Standard can be programmed in software or built with pure hardware.

Keywords—AES, Block Cipher, Cryptography, DES, NIST

Source:http://citeseerx.ist.psu.edu

Download Full Paper

How to read the digital certificate

A Digital Certificate is an electronic "password" that allows a person, organization to exchange data securely over the Internet using the public key infrastructure (PKI). Digital Certificate is also known as a public key certificate or identity certificate.

Digital certificates are used to encrypt online communications between an end user's browser and a website

[E-journal Cryptography] Extended AES Algorithm with Custom Encryption for government-level Classified Messages

Extended AES Algorithm with Custom Encryption for government-level Classified Messages

Sreyam Dasgupta, Pritish Das

Abstract: The paper is primarily concerned with the data security issues faced while sending the data over the network. The issues are can be avoided with the proposed algorithm: Extended AES Algorithm with Custom Configurable Encryption. The added layer of security is based on the Caesar Cipher encryption algorithm. Although the algorithm is highly vulnerable to a few attacks, our modifications in the algorithm are tailor-made to deny those attacks completely. The user has no

idea that Caesar's cipher is being used. Moreover, the key is changed for every word in the message, thus removing the vulnerability to the frequency analysis attack. This layer will give some added protection to the underlying AES algorithm, which is already very secure. In today’s electronic age, the importance of digital cryptography in securing electronic data transactions is unquestionable. Every day, users electronically generate and communicate a large volume of information with others. This information includes medical, financial and legal files; automatic and Internet banking; phone conversations, pay-per-view television, and other e-commerce transactions as well as military information and some top-secret government intel. To meet these requirements, Advanced Encryption

Standard (AES) for encryption of electronic data can be used. Governments prefer using AES for encryption of classified messages. Although no major attack on AES has been discovered yet, it is presumed that AES might have been broken without the attack being known to us. Thus, an added layer is used to make it safer.

Index Terms: AES, Cyber Security, Caesar Cipher

Source: https://www.ijitee.org

Download Full Paper

[e-Journal Cryptography] Improvement in the Performance and Security of Advanced Encryption Standard Using AES

Improvement in the Performance and Security of Advanced Encryption Standard Using AES Algorithm and Comparison with Blowfish

Amit Verma 1*

, Simarpreet Kaur 1, Bharti Chhabra 3

1M. Tech. Research Scholar, Computer Science & Engineering, Chandigarh Engineering College

3Assistant Professor, Computer Science& Engineering, Chandigarh Engineering College, Landran, Punjab, India

1* Professor and Head of Department, Computer Science& Engineering, Chandigarh Engineering College, Landran, Punjab,

IndiaDramitverma.cu@gmail.com

Abstract- Background\Objective: - The origin of cryptography is found in Roman and Egyptian culture. Cryptography is a thousand years old process to encrypt the messages. In its ancient form, people use cryptography to hide their messages that they want to keep secret from others by substituting the part of the message with symbols, numbers or pictures. With the increase in technology the need of cryptography is also increased which gives rise to new cryptographic algorithms such as DES, 3DES, AES and Blowfish

Source: https://pdfs.semanticscholar.org

Download full paper

AES 256 Encryption And Decryption With Java (CBC) Mode

[ SOLVED ] Wrong IV length: must be 16 bytes long

PROBLEM

Wrong IV length: must be 16 bytes long

CAUSE

IV Length less then 16 

My Code
public static String initVector = "12345678";

SOLVED

change IV variable like this
public static String initVector = "1234567812345678";

AES 256 Encryption And Decryption With Java (ECB) Mode

[SOLVED] java.security.NoSuchAlgorithmException: Cannot find any provider supporting AES/ECB/PKCS7Padding

PROBLEM

java.security.NoSuchAlgorithmException: Cannot find any provider supporting AES/ECB/PKCS7Padding

CAUSE

AES/ECB/PKCS7Padding not supported

SOLUTION

change with AES/ECB/PKCS5Padding

[SOLVED] PKIX path validation failed: java.security.cert.CertPathValidatorException: Path does not chain with any of the trust anchors

PROBLEM

PKIX path validation failed: java.security.cert.CertPathValidatorException: Path does not chain with any of the trust anchors

CAUSE 

does not recognize the digital certificate  issuer or path validatioan failed

My CODE 

  PKIXParameters params = new PKIXParameters(Collections.singleton(anchor));
  params.setRevocationEnabled(true);

SOLVED

• Change the digital certificate issuer/certificate authority to JKS format
• Change the source code to

 KeyStore keystore = KeyStore.getInstance("JKS");

            try (InputStream is = Files.newInputStream(Paths.get("root.jks"))) {
                keystore.load(is, "".toCharArray());
            }

            PKIXParameters params = new PKIXParameters(keystore);
            params.setRevocationEnabled(true);

[SOLVED] java.security.cert.CertPathValidatorException: Response is unreliable: its validity interval is out-of-date

PROBLEM
when validating digital certificates using ocsp get error

java.security.cert.CertPathValidatorException: Response is unreliable: its validity interval is out-of-date

CAUSE

the time on the client and server is not appropriate ... 

SOLVED

fix the time on the client or server with the correct time

EXAMPLE

at 19 Oct 2019 00:49, the client checks OCSP to the OCSP server and the response is 👇


CSP response:
Response Status: SUCCESS
Responder ID: byKey: 86AFCABDF4F169C1AAC9D78E98F2B029E3196645
Produced: Saturday 19 October 00:30:53 WIB 2019
1 response:
SingleResponse:
CertId
Algorithm: SHA-1
issuerNameHash
0000: 9C 46 39 8F C4 67 DC C5 77 58 E9 F1 F4 11 BC F9. F9..g..wX ......
0010: 11 14 E2 0E
issuerKeyHash:
0000: 86 AF CA BD F4 F1 69 C1 AA C9 D7 8E 98 F2 B0 29 ...... i ........)
0010: E3 19 66 45
SerialNumber: [2dbc67be 3bac5c48]
CertStatus: OK
This update is Saturday October 19 00:30:53 WIB 2019



there is a time difference between client and server

SHA 256 With Java

What is SHA-256?

The SHA (Secure Hash Algorithm) is one of several cryptographic hash functions. A cryptographic hash is like a signature for a text or a data file. SHA-256 algorithm generates an almost-unique, fixed-size 256-bit (32-byte) hash. Hash is a one-way function – it cannot be decrypted back. This makes it suitable for password validation, challenge hash authentication, anti-tamper, digital signatures.

SHA-256 is one of the successor hash functions to SHA-1 and is one of the strongest hash functions available.

[SOLVED] Timestamp signature property generation error: Unsupported transport protocol

Error :

Timestamp signature property generation error:  Unsupported transport protocol

SOLVED :

Write url tsa server with http://

[SOLVED] javax.crypto.IllegalBlockSizeException: Data must not be longer than 245 bytes

PROBLEM :
I am using rsa key to encrypt a long string. But it throws an exception like
javax.crypto.IllegalBlockSizeException: Data must not be longer than 245 bytes
at com.sun.crypto.provider.RSACipher.doFinal(RSACipher.java:344)
at com.sun.crypto.provider.RSACipher.engineDoFinal(RSACipher.java:389)
at javax.crypto.Cipher.doFinal(Cipher.java:2164)

CAUSE :

Using RSA to encrypt a large file is not a good idea. You could for example generate a random AES key, encrypt it using RSA and store it in the output file, and then encrypt the file itself with AES, which is much faster and doesn't have any problem with large inputs. The decryption would read the encrypted AES key, decrypt it, and then decrypt the rest of the file with AES.

" The RSA algorithm can only encrypt data that has a maximum byte length of the RSA key length in bits divided with eight minus eleven padding bytes, i.e. number of maximum bytes = key length in bits / 8 - 11 "

SOLVE

if key length 2048 maximum bytes data is 245 bytes
if key length 1024 maximum bytes data is 117 bytes

MANUAL RSA ENCRYPTION AND DECRYPTION WITH JAVA

                                    RSA Algorithm

For Example :

p value is 47
q value is 71
public key value is 79
Message : "HARI INI"

Question :
How Is Encryption And Decryption Process ?

Answer :

MANUAL RSA ENCRYPTION PROCESS

Prime 1 (p) value :47
Prima 2 (q) value :71
public (e) key :79
N (p x q) value :3337
phi (N) --> (p-1) x (q-1) :3220
Private Key (d) : (1+k*3220)/79; k=1,2,3,....
find d with rounded results by trying k values
obtained private key value (d) :1019
So :
Public Key : (79,3220)
Private Key: (1019,3220)

Message (M) = HARI INI

===============
ENCRYPTION PROCESS
===============

Conversion Message to Decimal Format
H = 72
A = 65
R = 82
I = 73
  = 32
I = 73
N = 78
I = 73

For this encryption process, I break m into smaller blocks, for example m is broken into six blocks that require 3 digits

M0=726
M1=582
M2=733
M3=273
M4=787
M5=003

CipherText (C) = Plaintext (M) ^ e mod N

C0 = 726 ^ 79 mod 3337 = 215
C1 = 582 ^ 79 mod 3337 = 776
C2 = 733 ^ 79 mod 3337 = 1743
C3 = 273 ^ 79 mod 3337 = 933
C4 = 787 ^ 79 mod 3337 = 1731
C5 = 3 ^ 79 mod 3337 = 158

CipherText: 215.776.1743.933.1731.158

Plaintext (M) =Ciphertext (C) ^ d mod N

P0 = 215 ^ 1019 mod 3337 = 726
P1 = 776 ^ 1019 mod 3337 = 582
P2 = 1743 ^ 1019 mod 3337 = 733
P3 = 933 ^ 1019 mod 3337 = 273
P4 = 1731 ^ 1019 mod 3337 = 787
P5 = 158 ^ 1019 mod 3337 = 3

Convert Desimal to Ascii
Return Decryption
72=H
65=A
82=R
73=I
32=
73=I
78=N
73=I

---- FINISH----