"Symmetric-key algorithms are algorithms for cryptography that use the same cryptographic keys for both the encryption of plaintext and the decryption of ciphertext."
A type of encryption where the same key is used to encrypt and decrypt a message.
Key management: The process of securely generating, storing, and distributing cryptographic keys.
Encryption algorithms: The mathematical operations used to transform plaintext into ciphertext.
Decryption algorithms: The mathematical operations used to transform ciphertext into plaintext.
Block ciphers: A symmetric key encryption algorithm that operates on fixed-size blocks of data.
Stream ciphers: A symmetric key encryption algorithm that operates on a stream of data.
Cryptographic hash functions: A mathematical function that converts input data into a fixed-size output called a hash value.
Message authentication codes (MAC): A cryptographic technique used to verify the integrity and authenticity of a message.
Cipher block chaining (CBC): A block cipher mode of operation that introduces feedback from previously encrypted blocks.
Electronic Codebook (ECB): A block cipher mode of operation that encrypts each block independently.
Padding schemes: The technique used to ensure that the data block size fits the standard block size of a cipher algorithm.
Weak keys: A symmetric key that can be exploited to allow an attacker to easily decrypt ciphertext.
Key schedule: The algorithmic procedure used to generate a sequence of subkeys from an original key for an encryption algorithm.
Differential cryptanalysis: A method used to analyze the security of a cryptographic algorithm.
Linear cryptanalysis: A method used to analyze the security of a cryptographic algorithm.
Meet-in-the-middle attack: An attack that exploits a weakness in certain block ciphers by calculating intermediate values.
Brute-force attack: A trial and error method of finding a key by checking all possible combinations.
Side-channel attacks: An attack that exploits weaknesses in the physical implementation of a cryptographic system, such as power consumption or electromagnetic emissions.
Quantum cryptography: A theoretical method of using quantum physics to create cryptographic keys that are theoretically unbreakable.
DES (Data Encryption Standard): A symmetric key block cipher that uses a key size of 56 bits.
Triple DES (3DES): A variant of DES that applies the encryption process three times to increase security.
AES (Advanced Encryption Standard): A symmetric key block cipher that uses a variable key size of 128, 192, or 256 bits, and is currently the most widely used encryption algorithm.
Blowfish: A symmetric key block cipher that uses a key size of between 32 and 448 bits, and is often used in network security protocols and virtual private networks.
Twofish: A symmetric key block cipher that uses a key size of between 128 and 256 bits, and is designed to be more secure than AES.
RC4 (Rivest Cipher 4): A symmetric key stream cipher that uses a variable key size of between 40 and 2048 bits, and is commonly used in wireless network security.
RC5 (Rivest Cipher 5): A symmetric key block cipher that uses a variable key size of up to 2048 bits, and is designed to be more efficient than DES and other block ciphers.
IDEA (International Data Encryption Algorithm): A symmetric key block cipher that uses a key size of 128 bits, and is commonly used in secure email and file transfer applications.
SEED (Smaller Encryption Algorithm): A symmetric key block cipher that uses a key size of 128 bits, and is commonly used in South Korea as a national encryption standard.
CAST (Carlisle Adams and Stafford Tavares): A symmetric key block cipher that uses a key size of between 40 and 128 bits, and is commonly used in electronic commerce applications.
"The keys, in practice, represent a shared secret between two or more parties that can be used to maintain a private information link."
"The keys may be identical, or there may be a simple transformation to go between the two keys."
"The requirement that both parties have access to the secret key is one of the main drawbacks of symmetric-key encryption, in comparison to public-key encryption."
"With exception of the one-time pad, they have a smaller key size, which means less storage space and faster transmission."
"Asymmetric-key encryption is often used to exchange the secret key for symmetric-key encryption."
"With exception of the one-time pad, they have a smaller key size, which means less storage space and faster transmission."
"The keys, in practice, represent a shared secret between two or more parties that can be used to maintain a private information link."
"The keys may be identical, or there may be a simple transformation to go between the two keys."
"Asymmetric-key encryption is often used to exchange the secret key for symmetric-key encryption."
"The requirement that both parties have access to the secret key is one of the main drawbacks of symmetric-key encryption, in comparison to public-key encryption."
"With exception of the one-time pad, they have a smaller key size, which means less storage space and faster transmission."
"Symmetric-key algorithms use the same cryptographic keys for encryption and decryption, while asymmetric-key algorithms use different keys."
"The keys, in practice, represent a shared secret between two or more parties that can be used to maintain a private information link."
"Asymmetric-key encryption is often used to exchange the secret key for symmetric-key encryption."
"With exception of the one-time pad, they have a smaller key size, which means less storage space and faster transmission."
"With exception of the one-time pad, they have a smaller key size, which means less storage space and faster transmission."
"The requirement that both parties have access to the secret key is one of the main drawbacks of symmetric-key encryption, in comparison to public-key encryption."
"The keys, in practice, represent a shared secret between two or more parties that can be used to maintain a private information link."
"The keys, in practice, represent a shared secret between two or more parties that can be used to maintain a private information link."