ElGamal Cryptosystem:Introduction:The ElGamal Cryptosystem is an asymmetric key algorithm designed for public-key cryptography. It was proposed by Taher ElGamal in 1985 and is based on the difficulty of the discrete logarithm problem. ElGamal is widely used for secure communication, digital signatures, and key exchange.
Key Components and Algorithm:
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RSA Algorithm:Introduction:RSA (Rivest-Shamir-Adleman) is a widely used asymmetric key algorithm for encryption and digital signatures. It was introduced in 1977 by Ron Rivest, Adi Shamir, and Leonard Adleman. The RSA algorithm is based on the mathematical properties of large prime numbers and their difficulty in factoring the product of two large primes.
Key Components:
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History:The concept of asymmetric key cryptography was first introduced by Whitfield Diffie and Martin Hellman in 1976. They proposed the idea of public-key cryptography, which laid the foundation for secure communication without the need for a shared secret key. Later, Ronald Rivest, Adi Shamir, and Leonard Adleman developed the RSA algorithm, one of the most widely used asymmetric key algorithms. Outline:
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1. Overview:
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1. Overview:
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1. Overview:
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1. Definition:
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1. Structure:
Structure:
Structure:
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1. Definition:
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1. Substitution-Permutation Network (SPN):
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1. Definition:
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1. Definition:
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Algorithm Types: Algorithms can be broadly categorized into several types based on their design and functionality. Some common types include:
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Key Range: The key range in cryptography refers to the set of possible values that a cryptographic key can take. It is essentially the numerical or alphanumeric space within which keys are generated. For example, in symmetric key cryptography, the key range may be all possible combinations of a fixed number of bits. A key range is determined by the key length, and the larger the key range, the more secure the cryptographic system is against brute-force attacks. Key Size: The key size, often referred to as key length, is the number of bits used in a cryptographic key. It directly influences the key range. The key size is a crucial factor in determining the strength of encryption algorithms. Generally, a larger key size means a larger key range and increased security, but it may also result in a higher computational cost. Advantages of Key Range and Key Size:
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Overview: Steganography is the practice of concealing information within other non-secret data in such a way that the presence of the hidden information is difficult to detect. Unlike cryptography, which focuses on making the content of a message unreadable, steganography aims to hide the existence of the message itself. This technique has been used for centuries and has evolved with the advancement of digital technologies. Applications of Steganography:
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Encryption: Encryption is the process of converting plaintext (human-readable data) into ciphertext (unreadable data) using an algorithm and a key. The primary purpose of encryption is to protect sensitive information during transmission or storage, ensuring that unauthorized parties cannot easily understand or alter the data. There are two main types of encryption: symmetric encryption (uses a single key for both encryption and decryption) and asymmetric encryption (uses a pair of public and private keys). Decryption: Decryption is the reverse process of encryption, where ciphertext is transformed back into plaintext using the appropriate algorithm and the corresponding key. The decryption process allows authorized parties to access the original information, ensuring confidentiality and integrity. Advantages of Encryption and Decryption:
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Transposition techniques in cryptography involve rearranging the order of characters in the plaintext without changing the actual characters themselves. This is achieved by using a key that determines the order of rearrangement. Two common types of transposition techniques are Single Columnar and Double Columnar transposition.
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Substitution techniques in cryptography involve replacing elements of the plaintext with other elements, typically according to a predetermined system or key. Here are explanations for various substitution techniques:
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Symmetric cryptography, also known as secret-key cryptography, involves the use of a single secret key for both encryption and decryption of data. The following sections will provide a detailed explanation of various aspects of the symmetric cipher model.
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7. Real-Time Use of Internet Security Protocols:
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