A cryptosystem is a set of
cryptographic algorithm
In mathematics and computer science, an algorithm () is a finite sequence of Rigour#Mathematics, mathematically rigorous instructions, typically used to solve a class of specific Computational problem, problems or to perform a computation. Algo ...
s that map
ciphertext
In cryptography, ciphertext or cyphertext is the result of encryption performed on plaintext using an algorithm, called a cipher. Ciphertext is also known as encrypted or encoded information because it contains a form of the original plaintext ...
s and
plaintexts to each other.
Private-key cryptosystems
Private-key cryptosystems use the same
key for
encryption
In Cryptography law, cryptography, encryption (more specifically, Code, encoding) is the process of transforming information in a way that, ideally, only authorized parties can decode. This process converts the original representation of the inf ...
and
decryption.
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Caesar cipher
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Substitution cipher
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Enigma machine
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Data Encryption Standard
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Twofish
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Serpent
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Camellia
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Salsa20
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ChaCha20
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Blowfish
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CAST5
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Kuznyechik
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RC4
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3DES
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Skipjack
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Safer
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IDEA
In philosophy and in common usage, an idea (from the Greek word: ἰδέα (idea), meaning 'a form, or a pattern') is the results of thought. Also in philosophy, ideas can also be mental representational images of some object. Many philosophe ...
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Advanced Encryption Standard
The Advanced Encryption Standard (AES), also known by its original name Rijndael (), is a specification for the encryption of electronic data established by the U.S. National Institute of Standards and Technology (NIST) in 2001.
AES is a variant ...
, also known as AES and Rijndael.
Public-key cryptosystems
Public-key cryptosystems use a public key for encryption and a private key for decryption.
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Diffie–Hellman key exchange
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RSA encryption
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Rabin cryptosystem
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Schnorr signature
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ElGamal encryption
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Elliptic-curve cryptography
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Lattice-based cryptography
Lattice-based cryptography is the generic term for constructions of cryptographic primitives that involve lattices, either in the construction itself or in the security proof. Lattice-based constructions support important standards of post-quant ...
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McEliece cryptosystem
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Multivariate cryptography
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Isogeny-based cryptography
References
{{reflist
Cryptography
Algorithms