To prevent known plaintext attacks, use a strong encryption algorithm, securely manage encryption keys, use a unique key for each session, and add randomness to the encryption process to enhance defense against attacks.
Choose an encryption algorithm that is resistant to known-plaintext attacks by using strong encryption techniques. Modern encryption algorithms such as the Advanced Encryption Standard (AES) defend against such attacks by preventing patterns in the plaintext from being associated with patterns in the ciphertext. AES is a widely used symmetric encryption algorithm known for its security and efficiency.
Securely manage encryption keys to avoid unauthorized access. Use a secure key repository, rotate keys frequently, and use strong key generation techniques. Also, avoid encrypting discrete, predictable chunks of data. To prevent attackers from using known pairs, encrypt the entire message or file.
Also, use different keys for different sessions and tasks. Since each session will use a different encryption key, the impact of known-plaintext attacks is reduced. Additionally, maintain the latest versions of systems, libraries, and encryption software. Security fixes that fix vulnerabilities are often included in updates.
Before encrypting the plaintext of the data, an encryption salt — a random value — is added to it. This makes each encryption unique, even if the same plaintext is encrypted multiple times. Also, avoid encryption methods that are known to be vulnerable to known-plaintext attacks. That said, do proper due diligence when choosing an encryption algorithm.
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