Category Archives: RSA

In RFC 2313 (PKCS1/RSA) said you could recreate the Private key from ‘n’ and ‘d’, which later versions removed. Why? [migrated]

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RFC 2313 has this specific callout:
1. An RSA private key logically consists of only the
modulus n and the private exponent d. The presence of the
values p, q, d mod (p-1), d mod (p-1), and q-1 mod p is
int… Continue reading In RFC 2313 (PKCS1/RSA) said you could recreate the Private key from ‘n’ and ‘d’, which later versions removed. Why? [migrated]→

Posted in RSA

Why in "openssl pkeyutl -verify" is needed both public and private keys? Why isn’t public key enough?

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I created a signature with:
openssl pkeyutl -sign -inkey rsa.key.bob -in plain -out plain.sig.bob

and to verify, Alice just needs to use Bob public key to check the authenticity of the message.
So why I have to use this (which require th… Continue reading Why in "openssl pkeyutl -verify" is needed both public and private keys? Why isn’t public key enough?→