Cryptosystem
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In cryptography, a cryptosystem is a suite of cryptographic algorithms needed to implement a particular security service, such as confidentiality (encryption). Typically, a cryptosystem consists of three algorithms: one for key generation, one for encryption, and one for decryption. The term cipher (sometimes cypher) is often used to refer to a pair of algorithms, one for encryption and one for decryption. Therefore, the term cryptosystem is most often used when the key generation algorithm is important. For this reason, the term cryptosystem is commonly used to refer to public key techniques; however both "cipher" and "cryptosystem" are used for symmetric key techniques.
In cryptography, a cryptosystem is a suite of cryptographic algorithms needed to implement a particular security service, such as confidentiality (encryption). Typically, a cryptosystem consists of three algorithms: one for key generation, one for encryption, and one for decryption. The term cipher (sometimes cypher) is often used to refer to a pair of algorithms, one for encryption and one for decryption. Therefore, the term cryptosystem is most often used when the key generation algorithm is important. For this reason, the term cryptosystem is commonly used to refer to public key techniques; however both "cipher" and "cryptosystem" are used for symmetric key techniques. \mathcal{E} = \{ E_k : k \in \mathcal{K} \} is a set of functions E_k : \mathcal{P} \rightarrow \mathcal{C} . Its elements are called "encryption functions". \mathcal{D} = \{ D_k : k \in \mathcal{K} \} is a set of functions D_k : \mathcal{C} \rightarrow \mathcal{P} . Its elements are called "decryption functions". For each e \in \mathcal{K} , there is d \in \mathcal{K} such that D_d(E_e(p)) = p for all p \in \mathcal{P} . Note; typically this definition is modified in order to distinguish an encryption scheme as being either a symmetric-key or public-key type of cryptosystem. ==See also== List of cryptosystems Semantic security
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