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* [[code book attack]] — collect all possible plaintext/ciphertext pairs for a [[block cipher]], or the entire pseudorandom stream until it st ====Ciphertext-only====

* [[code book attack]] — collect all possible plaintext/ciphertext pairs for a [[block cipher]], or the entire pseudorandom stream until it st ====Ciphertext-only====

...: it encrypts that plaintext to the intercepted ciphertext or decrypts the ciphertext to the plaintext. However, there are variants of the attack based on more l

...he same pseudorandom data, then reverse the combining operation to convert ciphertext back to plaintext. ...enemy who knows or guesses some plaintext and has intercepted the matching ciphertext can easily get some of the pseudorandom data. It must be very difficult for

Using t for plaintext and c for ciphertext, encryption is then:

...send you encrypted information. Only the intended recipient can read the ciphertext, by applying a private decryption key. A separate key pair is needed for ea

...]; they operate on fixed-size blocks of [[plaintext]], giving a block of [[ciphertext]] for each. The other main type are [[stream cipher]]s, which generate a co ...ate a [[code book attack | code book]], collecting so many known plaintext/ciphertext pairs that the cipher is broken.

...the Beast]] from the [[Book of Revelation]], is sometimes thought to be a ciphertext referring to the Roman Emperor Nero, one of whose policies was persecution

...n paper tape in Baudot code and combined them with exclusive OR to produce ciphertext. Vernam's device was not completely secure since the key tape ran in a loop

...xt) by converting it to an unreadable jumble of apparently random symbols (ciphertext). The process involves a [[cryptographic key | key]], a secret value that c ...ces ciphertext as output. For decryption, the process is reversed to turn ciphertext back into plaintext.

...rial are XOR-ed into the plaintext before encryption, and 64 more into the ciphertext afterward. With the 56 bits of DES key, the gives 184 total keys bits so th