Malleability

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The term malleability (English for malleability ) is a property of some cryptographic algorithms . An encryption algorithm is considered to be "malleable" if it is possible to change a ciphertext to a similar ciphertext that can be decrypted to a similar  plaintext . This means that with a given plaintext it is possible to generate another ciphertext that can be deciphered for a known function without ever knowing anything about it. ${\displaystyle m}$ ${\displaystyle f(m)}$ ${\displaystyle f}$ ${\displaystyle m}$

Malleability is often an undesirable property for a cryptographic scheme used in a general purpose as it allows an attacker to change the content of a message.