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First of all, a 1024-bit RSA key is much too small for comfort. Current recommendations for RSA are a debate between 3072 or 4096 (better security margin) vs. 2048 (better performance). See: https://crypto.stackexchange.com/questions/19655/what-is-the-history-of-recommended-rsa-key-sizes https://paragonie.com/blog/2019/03/definitive-2019-guide-cryptographic-...


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The 1024 bit number on the key describes the modulus used as part of encryption and decryption of a message (see https://security.stackexchange.com/a/8914/29905), which is paired with a public exponent for the public key and a private exponent for the private key - effectively, the message is first taken to the power of the public exponent e or the private ...


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