Network - Types of Network & Encryption

Encryption

• Changing data so that it can no longer be understood without a decryption(decode) key
• someone at your own level
• he "peers" are computer systems which are connected to each other via the Internet. Files can be shared directly between systems on the network without the need of a central server.
• a powerful computer which provides services required by any of the clients (computers on the network)

Plaintext

• the original message to be encrypted (coded)
• Changing data so that it can no longer be understood without a decryption(decode) key
• someone at your own level
• he "peers" are computer systems which are connected to each other via the Internet. Files can be shared directly between systems on the network without the need of a central server.

Ciphertext

• the encrypted (coded) message
• the original message to be encrypted (coded)
• Changing data so that it can no longer be understood without a decryption(decode) key
• someone at your own level

Encryption algorithm

• the formula for encrypting (coding) the plaintext (normal message)
• the encrypted (coded) message
• the original message to be encrypted (coded)
• Changing data so that it can no longer be understood without a decryption(decode) key

Deciphering or decryption

• recovering plaintext (normal message) from ciphertext (secret message)
• the formula for encrypting (coding) the plaintext (normal message)
• the encrypted (coded) message
• the original message to be encrypted (coded)

Decryption algorithm

• the formula that's used to change the message back to normal
• recovering plaintext (normal message) from ciphertext (secret message)
• the formula for encrypting (coding) the plaintext (normal message)
• the encrypted (coded) message

Secret key

• same key used for encryption (coding the secret message) and decryption (decoding the secret message)
• the formula that's used to change the message back to normal
• recovering plaintext (normal message) from ciphertext (secret message)
• the formula for encrypting (coding) the plaintext (normal message)

Cryptanalysis

• the way to decode the ciphertext (coded message) – typically by finding out the secret key
• same key used for encryption (coding the secret message) and decryption (decoding the secret message)
• the formula that's used to change the message back to normal
• recovering plaintext (normal message) from ciphertext (secret message)

Brute-force attack

• Every possible key is tried to find the secret code
• the way to decode the ciphertext (coded message) – typically by finding out the secret key
• same key used for encryption (coding the secret message) and decryption (decoding the secret message)
• the formula that's used to change the message back to normal

Non-brute-force attack

• figuring out the secret code by clever guessing, maybe by trying to find patterns in the data, by using knowledge of the data.
• Every possible key is tried to find the secret code
• the way to decode the ciphertext (coded message) – typically by finding out the secret key
• same key used for encryption (coding the secret message) and decryption (decoding the secret message)