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eBook :
Cryptography in Just three Hours
- 10
Chapters
Cryptography,
SSL/TLS, HTTPS, Public Key, Private Key, Digital certificates, PKI
(Public Key Infrastructure is a very confusing subject and ideally
if you are a developer you need to know basics of its workings and
this book is covering that. You don’t need to hours to understand
this concept this is the book we have created for you and make
sure that your fundamental understanding of SSL/TLS certificate,
public-private key, PKI, Cryptography, Digital certificate all are
covered in just few hours and you should not spend many days to
understand the same. In fact, to validate your understanding this
book cover 45+ interview questions. If you see all the big
publisher publishes books with 300 and 400 pages which requires
many days to complete a single book and most of the reader reads
first 2-3 chapters of the book and leave it for many days and they
start again from first chapter. We don’t want you to face the
similar problem, just read this book in one sitting and also give
you fundamental learning in just couple of hours and spend another
hour for question and answer-based learning. Anytime, you want to
revise this concepts comeback to book finish the same in couple of
hours.
Cryptography
is the study of secure communications techniques that allow only
the sender and intended recipient of a message to view its
contents. The term is derived from the Greek word kryptos, which
means hidden. It is closely associated to encryption, which is the
act of scrambling ordinary text into what's known as ciphertext
and then back again upon arrival. In addition, cryptography also
covers the obfuscation of information in images using techniques
such as microdots or merging. Ancient Egyptians were known to use
these methods in complex hieroglyphics, and Roman Emperor Julius
Caesar is credited with using one of the first modern ciphers.
When
transmitting electronic data, the most common use of cryptography
is to encrypt and decrypt email and other plain-text messages. The
simplest method uses the symmetric or "secret key" system. Here,
data is encrypted using a secret key, and then both the encoded
message and secret key are sent to the recipient for decryption.
The problem? If the message is intercepted, a third party has
everything they need to decrypt and read the message. To address
this issue, cryptologists devised the asymmetric or "public key"
system. In this case, every user has two keys: one public and one
private. Senders request the public key of their intended
recipient, encrypt the message and send it along. When the message
arrives, only the recipient's private key will decode it — meaning
theft is of no use without the corresponding private key.
Cryptography is a
study of securing communications from outside
observers. There are encryption algorithms which
takes the plaintext and generate ciphertext, and
without decryption nobody can understand it or
find the original text. To decrypt the
ciphertext you need a key (either same or
different) depend on the algorithm used. There are
following four objectives of the Cryptography.
|
| Symmetric Cryptography is sometime referred as a
symmetric key encryption or Secret Key Cryptography.
It means for both encryption and decryption you are
using the same key. As you can see below, same key
is used. Secret key cryptography can be used on both
in-transit and at-rest data. But it is commonly used
on at-rest data, as sending the secret to the
recipient of the message can lead to compromise.
Following are the Secret Key algorithm
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Table
of Contents
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| 50 Interview Questions and Answers |
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