# One-way encryption

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In cryptography, **one-way encryption** refers to:

- One-way function, a function difficult to invert.
^{[1]} - Trapdoor one-way function, a one-way function that requires a secret to invert efficiently.
- Asymmetric encryption, if it satisfies a rather weak condition of not being invertible by an attacker.
^{[2]} - Cryptographic hash functions, which are modelled on one-way functions but are different from encryption in the strict sense. When used as a message digest, however, they produce a similar output to that of many ciphers — thus the mixing of terminology. Cryptographic hash functions have two main aims: to be one-way and collision-resistant. The term
**one-way encryption**is often used in applications such as secure password storage, where the one-way property is important.

## References and notesEdit

- ↑ Encryption is, by definition, reversible. Hence, the term
*one-way encryption*is slightly incorrect in a sense.Template:Citation needed - ↑ E. Fujisaki, T. Okamoto,
*Advances in Cryptology*, CRYPTO 1999