What does encryption mean?
Encryption is the process of converting readable information, known as plaintext, into a scrambled, unreadable form called ciphertext, so that only someone possessing the correct key can decode and understand it. It lies at the heart of modern digital security: emails, banking transactions, medical records, and messaging apps all rely on encryption to keep sensitive data private as it travels across networks or sits in storage. The word functions as a noun, usually uncountable, and pairs with terms like 'strong', 'end-to-end', and 'key' in everyday technical language. Its counterpart, decryption, is the reverse process of turning ciphertext back into plaintext. Although encryption feels distinctly contemporary, the underlying idea of disguising messages from adversaries is ancient; what has changed is the sophistication of the mathematics involved. Today the term carries connotations of security, privacy, and trust, and it frequently surfaces in debates about personal privacy, government surveillance, and the protection of data in an increasingly connected world.
nounThe process of converting information or data into a coded form to prevent unauthorized access. It is the practice of scrambling readable text so that only someone with the correct key can restore and read it.
- The process of converting plaintext into ciphertext using an algorithm and key so it cannot be understood without the key (the dominant sense in modern computing).
- More broadly, the act of concealing or encoding any message in a form accessible only to authorized parties.
"All messages sent through the app are protected by end-to-end encryption."
"The bank uses strong encryption to protect customers' financial details during online transactions."
"Historians studying wartime communications examined how military encryption shaped the outcome of key battles."
Encryption is almost always uncountable; no standard plural form exists in common use.
"End-to-end encryption ensures that only the intended recipients can read a message."
Every time you see a padlock icon in your browser, encryption — a technique older than Julius Caesar — is quietly shielding your data from prying eyes.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of encryption
Encryption derives from the verb 'encrypt', formed from the Greek root 'kryptos', meaning hidden or concealed, combined with a Latin-influenced prefix and suffix pattern common in technical English coinages. The same Greek root gives rise to related words such as 'cryptic', 'cryptography', and 'crypt'. While the broader practice of secret writing dates back thousands of years, the specific term 'encryption' entered widespread use with the rise of modern computing and formal cryptographic science in the twentieth century.
Related word forms
How encryption is actually used
Encryption is primarily a technical term used in computing, telecommunications, and information security contexts, though it appears in general journalism when privacy or cybersecurity is discussed. It is uncountable in most uses; 'an encryption' is rare. The adjective 'encrypted' describes the resulting data.
Easily confused with encryption
Encryption converts readable data into a scrambled, unreadable form, whereas decryption reverses that process to restore the original readable data.