The Difference Between Encoding and Encryption
Encoding is often confused with encryption. They are not the same. But before I go into the differences, I'll first mention the similarities:
- Both transform data into another format.
- Both are reversible (unlike hashing).
And now the differences:
Encoding
Encoding transforms data into another format using a scheme that is publicly available so that it can easily be reversed. It does not require a key as the only thing required to decode it is the algorithm that was used to encode it.
Examples: ASCII, Unicode, URL Encoding, Base64
Encryption
The purpose of encryption is to transform data in order to keep it secret from others, e.g. sending someone a secret letter that only they should be able to read, or securely sending a password over the Internet. Rather than focusing on usability, the goal is to ensure the data cannot be consumed by anyone other than the intended recipient(s).
Encryption transforms data into another format in such a way that only specific individual(s) can reverse the transformation. It uses a key, which is kept secret, in conjunction with the plaintext and the algorithm, in order to perform the encryption operation. As such, the ciphertext, algorithm, and key are all required to return to the plaintext.
Summary
- Encoding is for maintaining data usability and can be reversed by employing the same algorithm that encoded the content, i.e. no key is used.
- Encryption is for maintaining data confidentiality and requires the use of a key (kept secret) in order to return to plaintext.
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[ Posted: May 2010 ]
References
[ Encryption | wikipedia.org ]
[ Encoding | wikipedia.org]