The public key structure should contain both components. It is a special number called the fifth prime of Fermat, usually indicated by 'F4' (zero based indexation). Nowadays it is commonly set to the value 65537, which is 010001 in hexadecimals. The public exponent can be any value and could be up to 2048 bits as well. It is therefore 2048 bits if that's the size given to the key pair generator. The size of the modulus determines the key size. The key length isn't 2048 bits because a public key contains not only the modulus n, but also the encryption exponent e.

The DER format contains the same data, but in binary form, which is perhaps a little less portable. K5LdcRp+CUrHfqwimiFUEZ+KNOob1klAyY4UKX9CI1AnWwZuSrmtbH+11CfwgnnkĥRpqDvFNB30qsuD0elE+9zLOrq0jGicEoPtYAC3Z7phoODoR5vHbJ0R38qGItLMl HhKflp3B57X3+Qn1EbIYDFThWxy4HUZXh64LJiA5s0yeYzlGyjcC6R/Q59/CsyKP YRtK9wcEr5epTX6iahxqgObgjFAbIRd6+we6znxBy+OG0JfEGn/GSBoq9g8mcr2e MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAtd2o9NY7P9CvXzECu4Ky If you want to export the key for use somewhere else, you will probably find it easier to export the key in PEM format as follows: > print(key.publickey().exportKey('PEM'))

Rsa 2048 decryption python pycryptodome