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Encryption (Keys (A key is used to decrypt and encrypt data, it is…
Encryption
Keys
A key is used to decrypt and encrypt data, it is combined with a plain or cyphertext to convert it to an encrypted message or get the original
Key length and encoding is specific to the algorithm, so each encryption algorithm has different numbers of possible keys
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Encryption algorithms
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A key is used to encrypt and decrypt data within that encryption algorithm, the data can only be encrypted or decrypted by a specific key
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Symmetric encryption
One key is used to both encrypt and decrypt data, the key is shared with both the sender and recipient of the data.
This can be insecure as the key could be intercepted by a hacker and all of the data can be decrypted
Asymetric encryption
One key is used to encrypt data (public key), and one is used to decrypt data (private key)
This is more secure as the private key used to decrypt data is never shared, so it can't be intercepted
Encryption is the process of converting a message (plaintext) in to an encrypted message (cyphertext), this can be useful for security of information bieng sent over a network or stored locally
As computers have become more powerful, some encryption algorithms have become redundant, as the keys can be cracked almost instantly, or there is an issue with the algoritm itself, leaving it vunerable to statistical attacks
Sometimes enryption can be used to identify the integrity or origin of files, for example: MD5 checksums and PGP (pretty good privacy) keys