"In cryptography, encryption is the process of encoding information... Ideally, only authorized parties can decipher a ciphertext back to plaintext and access the original information."
Methods and technologies to secure data using encryption.
Basic Concepts of Cryptography: It includes the definition and objectives of cryptography, types of attacks, cipher, key, encryption and decryption, entropy and randomness, etc.
Classical Cryptography: It includes ciphers such as Caesar cipher, substitution cipher, Vigenere cipher, etc.
Modern Cryptography: It includes symmetric key cryptography, asymmetric key cryptography, hash functions, message authentication codes, digital signatures, etc.
Key Management and Distribution: The topics include key generators, key escrow, key agreement, digital certificates, public key infrastructure, etc.
Cryptographic Protocols: Protocols such as SSL/TLS, IPSec, PGP, SSH, etc., are included under this heading.
Steganography: It is a technique of hiding the message or file in another file, image, video, or audio to protect them from interception.
Cryptographic Attacks: Attacks such as brute-force attacks, dictionary attacks, rainbow table attacks, etc., are included under this heading.
Cryptanalysis: It is the study of breaking the cryptographic algorithms or codes.
Quantum Cryptography: Quantum cryptography uses the principles of quantum mechanics to exchange cryptographic keys.
Cryptography in Practice: It involves the use of cryptography in various applications such as email encryption, disk encryption, wireless network security, etc.
Symmetric-key encryption: Also known as shared-secret encryption, it uses the same key for both encryption and decryption of data.
Asymmetric-key encryption: Also known as public-key encryption, it uses two keys: A public key for encryption and a private key for decryption.
Hash functions: A mathematical function that generates a fixed-size output, which is unique to the input data.
Block ciphers: Cryptographic algorithms that encrypt fixed-size blocks of data, usually in multiples of 64 or 128 bits.
Stream ciphers: Encryption algorithms that operate on individual bits or bytes of plaintext, converting them into cipher text in a continuous stream.
Hybrid encryption: A combination of symmetric and asymmetric key encryption, which reduces the risk of information interception.
Quantum cryptography: A new type of encryption that uses the laws of quantum physics to protect data.
Homomorphic encryption: Encryption technique that allows computations to be carried out on ciphertext, without requiring it to be decrypted first.
Hash-based message authentication codes: A combination of hash functions and symmetric-key encryption, used for data integrity checks.
Zero-knowledge proofs: Authentication protocol that allows one party to prove to another that they possess certain knowledge, without revealing what it is.
"Encryption does not itself prevent interference but denies the intelligible content to a would-be interceptor."
"For technical reasons, an encryption scheme usually uses a pseudo-random encryption key generated by an algorithm."
"It is possible to decrypt the message without possessing the key but, for a well-designed encryption scheme, considerable computational resources and skills are required."
"An authorized recipient can easily decrypt the message with the key provided by the originator to recipients but not to unauthorized users."
"Historically, various forms of encryption have been used to aid in cryptography. Early encryption techniques were often used in military messaging."
"Since then, new techniques have emerged and become commonplace in all areas of modern computing."
"Modern encryption schemes use the concepts of public-key and symmetric-key."
"Modern encryption techniques ensure security because modern computers are inefficient at cracking the encryption."
"This process converts the original representation of the information, known as plaintext..."
"...into an alternative form known as ciphertext."
"Encryption does not itself prevent interference but denies the intelligible content to a would-be interceptor."
"For technical reasons, an encryption scheme usually uses a pseudo-random encryption key generated by an algorithm."
"...for a well-designed encryption scheme, considerable computational resources and skills are required."
"An authorized recipient can easily decrypt the message with the key provided by the originator to recipients but not to unauthorized users."
"Early encryption techniques were often used in military messaging."
"Since then, new techniques have emerged and become commonplace in all areas of modern computing."
"Modern encryption schemes use the concepts of public-key and symmetric-key."
"Modern encryption techniques ensure security because modern computers are inefficient at cracking the encryption."
"In cryptography, encryption is the process of encoding information..."