Key size - Wikipedia

In cryptography, key size or key length refers to the number of bits in a key used by a cryptographic algorithm (such as a cipher). Key length defines the upper-bound on an algorithm's security (i.e. a logarithmic measure of the fastest known attack against an algorithm), because the security of all algorithms can be violated by brute-force attacks. Ideally, the lower-bound on an algorithm's secur

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“2048-bit keys are sufficient until 2030. An RSA key length of 3072 bits should be used if security is required beyond 2030.”

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RSA暗号鍵を1024文字以上とする的なところのお話あとで読む