Cryptography: Basics, Techniques, and Applications Explained

Modes Of Operation: Electronic Codebook (ECB), Cipher Block Chaining (CBC), Output Feedback (OFB), And Counter (CTR) Modes

Date: 6th October 2026, Tuesday | Editor: Techk's Team

Modes of Operation: ECB, CBC, OFB, and CTR Introduction A block cipher is a symmetric-key cryptographic algorithm that encrypts information in fixed-size blocks. Examples include the Advanced Encryption Standard (AES) and the older Data Encryption Standard (DES). AES operates on 128-bit blocks,....

Cipher Block Chaining (CBC) Mode Of Operation

Date: 6th October 2026, Tuesday | Editor: Techk's Team

Introduction Cipher Block Chaining (CBC) is one of the classical modes of operation for block ciphers. It allows a block cipher such as the Advanced Encryption Standard (AES) to securely encrypt messages that are longer than a single fixed-size block. Instead of encrypting every plaintext block....

Stream Ciphers: One-Time Pad And RC4

Date: 5th October 2026, Monday | Editor: Techk's Team

Introduction to Stream Ciphers A stream cipher is a symmetric-key encryption technique that encrypts plaintext one bit, one byte, or sometimes a larger unit at a time by combining the plaintext with a generated keystream. Unlike a block cipher, which processes fixed-size blocks such as 64 or 128....

Data Encryption Standard (DES): Complete Explanation | Importance Of DES In Cryptography Education

Date: 5th October 2026, Monday | Editor: Techk's Team

Introduction to DES The Data Encryption Standard (DES) is a symmetric-key block cipher that was historically one of the most widely used encryption algorithms. It was designed to protect digital information from unauthorized access by transforming readable plaintext into unintelligible ciphertext.....

Block Ciphers: Types Of Encryption, Advantages, Disadvantages, And Applications

Date: 5th October 2026, Monday | Editor: Techk's Team

Introduction to Block Ciphers A block cipher is a fundamental cryptographic technique used to protect digital information by transforming plaintext into ciphertext. Unlike methods that process data one character or bit at a time, a block cipher divides the plaintext into fixed-size blocks and....

Fundamentals Of Digital Steganography | Basic Concepts And Hiding Data Within Other Media

Date: 2nd October 2026, Friday | Editor: Techk's Team

Steganography is the ancient art and modern science of hiding information within ordinary, non-secret messages or media to avoid detection. Unlike cryptography, which scrambles a message so that unauthorized parties cannot read its content, steganography conceals the very existence of the....

Transposition Ciphers: Rail Fence And Row Transposition Techniques

Date: 2nd October 2026, Friday | Editor: Techk's Team

Introduction to Transposition Ciphers A transposition cipher is a classical cryptographic technique in which the characters of a plaintext message are rearranged according to a specific rule to produce ciphertext. Unlike substitution ciphers, transposition does not replace plaintext characters....

Substitution Ciphers: Concept, Types, Working, Advantages, Limitations, And Applications

Date: 2nd October 2026, Friday | Editor: Techk's Team

Introduction to Substitution Ciphers A substitution cipher is one of the oldest and simplest techniques used in cryptography to protect information. In a substitution cipher, characters in the original plaintext are replaced with other characters, symbols, numbers, or groups of characters....

Asymmetric Cryptography: Definition, Working, Types, Advantages, Disadvantages, And Applications

Date: 1st October 2026, Thursday | Editor: Techk's Team

Asymmetric Cryptography 1. Introduction to Asymmetric Cryptography Asymmetric cryptography, also known as public-key cryptography, is a major branch of modern cryptography that uses two mathematically related keys instead of a single shared secret key. These two keys are called the public key and....

Symmetric Cryptography: Definition, Working, Types, Advantages, Disadvantages, And Applications

Date: 1st October 2026, Thursday | Editor: Techk's Team

Introduction to Symmetric Cryptography Symmetric cryptography is one of the oldest and most important branches of modern cryptography. It is a method of protecting information by using the same secret key for both encryption and decryption. In simple terms, the sender uses a secret key to convert....

Mathematical Background: Modular Arithmetic, The Euclidean Algorithm, Prime Numbers, And Finite Fields GF(p)

Date: 30th September 2026, Wednesday | Editor: Techk's Team

Introduction Modern cryptography rests on a small set of mathematical ideas from number theory and abstract algebra. Ciphers such as RSA, Diffie-Hellman, elliptic-curve systems, and AES all perform arithmetic in structured finite sets rather than on ordinary real numbers. Understanding these....

Cryptography: Security Threats, Security Services, And Security Mechanisms

Date: 30th September 2026, Wednesday | Editor: Techk's Team

Introduction Information security is the discipline of protecting data, systems, and communications from unauthorized access, alteration, disruption, or destruction. As organizations and individuals rely on networks for banking, commerce, healthcare, education, and government, the value of the....

Active And Passive Attacks In Cryptography: Types, Examples, And Prevention

Date: 28th September 2026, Monday | Editor: Techk's Team

Introduction to Cryptographic Attacks Cryptography is designed to protect information from unauthorized access, modification, impersonation, and other security threats. However, cryptographic systems operate in environments where attackers may attempt to observe communications, manipulate....

Basic Concept Of Cryptography (Purpose Of Cryptography, Plaintext, Ciphertext, Encryption, Symmetric-Key Cryptography)

Date: 28th September 2026, Monday | Editor: Techk's Team

Introduction to Cryptography Cryptography is the science and practice of protecting information by transforming it into a form that unauthorized people cannot easily understand. The word cryptography originates from Greek words meaning “hidden writing.” In modern computer networks,....

What Is Cryptography And Why Is It Important?

Date: 22nd April 2025, Tuesday | Editor: Techk Team

In today’s digital world, where data breaches and cyberattacks are becoming more frequent, cryptography plays a vital role in ensuring secure communication and data protection. But what exactly is cryptography, and why is it so crucial in the modern age of technology? This article breaks....