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Blowfish has known key-weaknesses that can lead to the discovery of your plaintext if you happen to pick a vulnerable key. Mark's answer is also fairly accurate, smaller keys equals easier cracking time, and with larger keys it is almost impossible to brute-force. Since Blowfish has key-vulnerabilities, it has been replaced with newer versions (Twofish and ...


The difficulty of brute-forcing your ciphertext depends on what key size you used when encrypting: Blowfish has an adjustable key size, ranging from 32 bits to 448 bits; this size is independent of the complexity of your password. At the 32-bit end of things, your ciphertext could be decrypted in a matter of minutes, while at 128 bits or larger, it would ...

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