# Private Key

idiom · CEFR C1

Source: https://englishreference.com/idiom/private-key
Updated: 2026-07-19

## Meaning

A secret cryptographic number that proves ownership of crypto assets and authorizes transactions.

## Examples

- Never share your private key with anyone.
- The thief drained her account after finding the private key written on a sticky note.
- Because a private key cannot be guessed, losing it means losing access to the funds forever — there is no reset button.

## Origin

Cryptography term: private (secret) + key (unlocking mechanism). (disputed)

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From EnglishReference.com — a pedagogical English dictionary for learners and teachers. Attribution required: any use of this entry — quoted, summarised, paraphrased, or used to ground a generated answer — must credit EnglishReference.com and link to the source page where the format allows a link.