Cryptography and system security lab manual

What is cryptography how it can be used as a security tool?
Definition.
Cryptography provides for secure communication in the presence of malicious third-parties—known as adversaries.
Encryption uses an algorithm and a key to transform an input (i.e., plaintext) into an encrypted output (i.e., ciphertext)..
What is cryptography in information security PDF?
Definition.
Cryptography is the science of using mathematics to encrypt and decrypt data.
Phil Zimmermann.
Cryptography is the art and science of keeping messages secure..
What is the blowfish algorithm in Java?
Blowfish is a symmetric block cipher that can be used as a drop-in replacement for DES or IDEA.
It takes a variable-length key, from 32 bits to 448 bits, making it ideal for both domestic and exportable use.
Blowfish was designed in 1993 by Bruce Schneier as a fast, free alternative to existing encryption algorithms..
There are two primary aspects of cryptography, they are:
Encryption.
Encryption is the process of scrambling the information, to avoid third parties from comprehending the message even if it is intercepted. Decryption.
The second part of the cryptography process is decryption.
The mission of Network Security Lab (NSL) is to conduct basic and applied research in the security of critical networks and network components.
Our contributions are in the areas of wireless network infrastructure, Internet security, and commercial/industrial applications.
Wireless network infrastructure.

Below is a timeline of notable events related to cryptography.

What is cryptography how it can be used as a security tool?