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Encryption is the process of transforming plaintext using a cipher into ciphertext to make it unreadable to anyone except those possessing the key. Decryption is the process of transforming that ciphertext back into plaintext, using the key.

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Property that prevents determining key from ciphertext and plaintext

What is the property (if it is not Forward Secrecy) that prevents (good) symmetrical encryption algorithms from being vulnerable to an attack vector that requires only decrypted data, and the corresponding … Note that this is not about hashes, or asymmetric encryption (or any other session-token-based method), as those questions can be found at the corresponding links. …
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