Like a chosen-plaintext attack, except the attacker can obtain ciphertexts encrypted under two different keys. The keys are unknown, but the relationship between them is known; for example, two keys that differ in the one bit.

Computational resources required

Attacks can also be characterised by the resources they require. Those resources include:
* Time - the number of computation steps (e.g., test encryptions) which must be performed.
* Memory - the amount of storage required to perform the attack.
* Data - the

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