# Broadcast attack

By [Untitled](https://paragraph.com/@0x58e1d090217e7694b0530b398976df76d7ad2ce4) · 2023-07-27

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**Broadcast attack:** This attack \[[**104**](https://www.mdpi.com/2410-387X/5/4/38#B104-cryptography-05-00038)\] aims to recover a single message sent to several recipients. Here, the cryptanalyst knows only several ciphertexts of the same message. Since the same message is encrypted with several public keys, it was found that it is possible to recover the message. This attack has been used to break the Niederreiter and HyMES (Hybrid McEliece Encryption Scheme) cryptosystems.

2.

**Known partial plaintext attack:** A known partial plaintext attack \[[**105**](https://www.mdpi.com/2410-387X/5/4/38#B105-cryptography-05-00038)\] is an attack for which only a part of the plaintext is known.

3.

**Sidelnikov–Shestakov attack:** This attack \[[**106**](https://www.mdpi.com/2410-387X/5/4/38#B106-cryptography-05-00038)\] aims to recover an alternative private key from the public key.

4.

**Generalised known partial plaintext attack:** This attack \[[**102**](https://www.mdpi.com/2410-387X/5/4/38#B102-cryptography-05-00038)\] allows to recover the plaintext by knowing a bit’s positions of the original message.

5.

**Message-resend attack:** A message-resend condition \[[**102**](https://www.mdpi.com/2410-387X/5/4/38#B102-cryptography-05-00038)\] is given if the same message is encrypted and sent twice (or several times) with two different random error vectors to the same recipient.

6.

**Related-message:** In a related-message attack against a cryptosystem, the attacker obtains several ciphertexts such that there exists a known relation between the corresponding plaintexts.

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*Originally published on [Untitled](https://paragraph.com/@0x58e1d090217e7694b0530b398976df76d7ad2ce4/broadcast-attack)*