Verifying - Enter pass phrase for private.pem: qwerty Generating RSA private key, 2048 bit long modulusĮnter pass phrase for private.pem: qwerty :~/crackkey$ openssl genrsa -des3 -out private.pem 2048 Unfortunately this can often be cracked with a brute force or dictionary attack.The method we can use is illustrated below:įirst we generate a private key and setup a password of "qwerty": This applies a passwords onto the private. The RSA private key can be stored in a PEM file format. So let's look at cracking the private key. The overhead is the time taken to try the key. For one million passwords, it rises to 20 bits, which is considerably shorter than a 128-bit key. For example, if our password is generated from a list of 1,024 words, we only have an equivalent key size of 10 bits. This considerable reduces the strength of the key. One of the weakest things about cryptography is that you might have a strong encryption key (such as a 128-bit or 256 bit key), but you create it from a pass phrase, or where you protect it with a password.
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