What does cryptosystem mean?
A cryptosystem is the complete architecture by which information is made unreadable to unauthorized parties and then restored to readable form by intended recipients. Rather than referring to a single algorithm, the term covers the whole arrangement of encryption and decryption methods, the keys they use, and the procedures governing how those keys are created, distributed, and managed. Cryptosystems are classified chiefly as symmetric, where sender and receiver share the same secret key, or asymmetric (public-key), where paired public and private keys allow strangers to communicate securely without prior exchange of secrets. The word belongs to the specialized vocabulary of cryptography, computer security, and mathematics, appearing in academic papers, standards documents, and technical journalism. Its significance is hard to overstate: every encrypted email, online banking session, and secure web page depends on some cryptosystem functioning correctly, which is why evaluating and standardizing them is a major ongoing concern in cybersecurity.
nounA cryptosystem is a complete set of algorithms, procedures, and associated keys used together to encrypt and decrypt messages in order to secure communications. It encompasses the entire scheme — including key management and the underlying mathematical methods — rather than a single cipher.
- A complete set of cryptographic algorithms, keys, and procedures used to encrypt and decrypt data for secure communication.
"The bank upgraded its cryptosystem to protect customer transactions against increasingly sophisticated attacks."
"RSA remains one of the most widely deployed public-key cryptosystems on the internet."
"The researchers published a proof that no classical computer could efficiently break the lattice-based cryptosystem."
Standard regular plural; common in technical writing when comparing different schemes.
"Modern browsers support several cryptosystems to negotiate secure connections."
Every HTTPS padlock in your browser relies on a cryptosystem whose security rests on a math problem so hard that breaking it would take conventional computers longer than the age of the universe.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of cryptosystem
Cryptosystem is a twentieth-century compound formed from two elements of Greek origin: 'crypto-', from Greek kryptos meaning 'hidden' or 'concealed', and 'system', from Greek systēma meaning 'an organized whole'. The 'crypto-' element had long been established in English words such as cryptography before being combined with 'system' as modern electronic cryptography developed in the mid-twentieth century. Related English derivatives sharing the kryptos root include cryptography, encrypt, cryptic, and apocrypha.
Related word forms
How cryptosystem is actually used
Cryptosystem is a technical term used primarily in cryptography, computer science, and information security literature; it is rarely heard in everyday conversation. It is countable, and writers often specify its type — symmetric, asymmetric (public-key), or hybrid.
Easily confused with cryptosystem
A cipher is a single encryption algorithm, whereas a cryptosystem is the broader framework that combines one or more ciphers with keys and protocols.
Cryptocurrency is digital money secured by cryptography; a cryptosystem is any general scheme for encrypting and decrypting information, not necessarily involving money.