java cryptography architecture
Post on 18-Nov-2014
996 Views
Preview:
DESCRIPTION
TRANSCRIPT
JAVA CRYPTOGRAPHYARCHITECTURESubmitted by:- TUFAIL KHAN-100101246VARUN-1001011254
1
CRYPTOGRAPHY Hidden writing
Used to protect information
Can ensure confidentialityo Integrity and Authenticity too
cont..
2
Cryptography -: to achieve encoding messages to make them no-readable.
………
3
Cryptanalysis-: technique of decode no-readable into readable.
....
4
Cryptology-: combination of cryptography and cryptanalysis.
5
BASIC CRYPTOGRAPHIC FUNCTIONS Private/Public Key Pair
Generation Secret Key Generation Hash Functions Digital Signatures Random Number
Generation Encryption/Decryption
6
SECRET, PUBLIC KEY CRYPTOGRAPHY AND HASH FUNCTIONS
Secret Key Cryptography (SKC): Uses a single key for both encryption and decryption
Public Key Cryptography (PKC): Uses one key for encryption and another for decryption
Hash Functions: Uses a mathematical transformation to irreversibly "encrypt" information
7
8
ADVANTAGES OF JAVA IN CRYPTOGRAPHY
Develop programs more quickly Avoid platform dependencies Write once, run anywhere Distribute software more easily
9
JAVA CRYPTOGRAPHIC
TWO MAIN TECHNOLOGIES-
Java Cryptographic Architecture (JCA) - It is a set of classes that provide cryptographic capabilities to java programs.
Java cryptographic Extension (JCE)- Whereas JCE is not the part of core Java JDK. For this request special licensing.
10
JAVA CRYPTOGRAPHIC ARCHITECTURE
JCA is the part of core java framework. Security API in JDK 1.1 introduced the JCA. It’s provide the basic cryptographic
functionalities to programmer using java language.
Cryptographic functionalities such as- access control, permissions, key pairs, message digests and digital signatures.
In order to achieve this, the JCA package consists of a number of classes, called as engine classes.
11
ENGINE CLASSES It is a logical representation of cryptographic
functionality. Such as:-
Message digestDigital signatureKey generatorRandom number
12
ENGINE CLASS
13
TYPES OF ENGINE CLASSES
14
SIGNATURE CLASS public abstract class Signature extends SignatureSpi Used to provide applications the functionality of a
digital signature algorithm Provides implementation independent algorithms There are two ways to request a signature algorithm
object:- Specifying an algorithm name Specifying both algorithm name and package provider
15
DIGITAL SIGNATUREPublic key cryptography is also used to provide
digital signatures.
signingplaintext signed message
private key
verificationsigned message plaintext
public key
16
KEYSTORE
Manage secret keys, key pairs and digital certificates
A password-protected database stores private key and its associated public key
certificate Can contain trusted certificates Each entry is identified by an alias
An alias may identify the purpose of the key. i.e. signMyEmails
17
MESSAGE DIGEST
public abstract class MessageDigest extends MessageDigestSpi
Also known as “hash function” or “one-way transformation”.
Transforms a message of any length and computes a fixed length string.
We want it to be hard to guess what the message was given only the digest. Guessing is always possible.
18
MESSAGE DIGEST
19
ENCRYPTING DATA
This class is called as Cipher class
Javax.cryptro.Cipher
It provides an interface to encrypt and decrypt data
either in arrays within the program or as that data is read or written through Java’s stream interfaces
20
ENCRYPTION
21
Encryption is the process of feeding plaintext and key into a function and getting ciphertext output
Ciphertext is “garbage” unless decrypted
EncryptionFunction
Plaintext
DECRYPTION
22
Decryption is the process of feeding ciphertext and a key into another function and getting original plaintext output Decryption
Function
Plaintext
RANDOM NUMBER GENERATOR
23
It is used to create cryptographic keys and in some cases to encrypt or sign data.
Its value could not be predicted
PRNG(Pseudo Random Number Generator) is used by computers to generate endless sequence of random numbers
THANK YOU!!!!!
24
top related