Decryption

Decryption is the process of converting encrypted (scrambled) data back into its original readable form. It requires the correct key — without it, the encrypted data is unreadable. Decryption is the counterpart to encryption, and together they form the basis of all secure digital communications.

Encryption and decryption

Original data  →  [Encryption with key]  →  Encrypted data
Encrypted data →  [Decryption with key]  →  Original data

Types of encryption/decryption

Symmetric

The same key is used to both encrypt and decrypt. Fast, but requires securely sharing the key beforehand.

Asymmetric (public-key)

Two mathematically linked keys:

• Data encrypted with the public key can only be decrypted with the private key
• Used in SSL/TLS, cryptocurrency wallets, and digital signatures

In cryptocurrency

Cryptocurrency doesn't typically encrypt transaction data — the blockchain is public and transparent. However, decryption is used in:

• Wallet software — private keys are often stored in encrypted form; entering your password decrypts them for signing
• Encrypted messaging — some crypto applications use end-to-end encrypted communication
• SSL/TLS — all connections to exchanges, pools, and web wallets use decryption to secure data in transit

See also

• Cryptography
• Private key
• SSL