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ECC can be used to encrypt the data itself with the public key instead of encrypting a random key and then symmetrically encrypting the data with that random key. But this is not a good idea as explained in Thomas Pornin's answer to In PGP, why not just encrypt message with recipient's public key? Why the meta-encryption?.

In any case ECIES uses a symmetric encryption algorithm to actually encrypt the data, so even if you use ECC to encrypt all the data, you're still encrypting it with a random symmetric key. But if you're encrypting the data itself with ECIES you could use a simple XOR as the symmetric encryption algorithm, which is effectively a one-time-pad. This has a theoretical advantage in that, unlike other symmetric encryption algorithms, one-time-pads are information-theoretically secure.

ECC can be used to encrypt the data itself with the public key instead of encrypting a random key and then symmetrically encrypting the data with that random key. But this is not a good idea as explained in Thomas Pornin's answer to In PGP, why not just encrypt message with recipient's public key? Why the meta-encryption?.

In any case ECIES uses a symmetric encryption algorithm to actually encrypt the data, so even if you use ECC to encrypt all the data, you're still encrypting it with a random symmetric key. But if you're encrypting the data itself with ECIES you could use a simple XOR as the symmetric encryption algorithm, which is effectively a one-time-pad. This has a theoretical advantage in that, unlike other symmetric encryption algorithms, one-time-pads are information-theoretically secure.

ECC can be used to encrypt the data itself with the public key instead of encrypting a random key and then symmetrically encrypting the data with that random key. But this is not a good idea as explained in Thomas Pornin's answer to In PGP, why not just encrypt message with recipient's public key? Why the meta-encryption?.

In any case ECIES uses a symmetric encryption algorithm to actually encrypt the data, so even if you use ECC to encrypt all the data, you're still encrypting it with a random symmetric key. But if you're encrypting the data itself with ECIES you could use a simple XOR as the symmetric encryption algorithm.

ECC can be used to encrypt the data itself with the public key instead of encrypting a random key and then symmetrically encrypting the data with that random key. But this is not a good idea as explained in Thomas Pornin's answer to In PGP, why not just encrypt message with recipient's public key? Why the meta-encryption?.

In any case ECIES uses a symmetric encryption algorithm to actually encrypt the data, so even if you use ECC to encrypt all the data, you're still encrypting it with a random symmetric key. But if you're encrypting the data itself with ECIES you could use a simple XOR as the symmetric encryption algorithm, which is effectively a one-time-pad. This has a theoretical advantage in that, unlike other symmetric encryption algorithms, one-time-pads are information-theoretically secure.

ECC can be used to encrypt the data itself with the public key instead of encrypting a random key and then symmetrically encrypting the data with that random key. But this is not a good idea as explained in Thomas Pornin's answer to In PGP, why not just encrypt message with recipient's public key? Why the meta-encryption?.

ECC can be used to encrypt the data itself with the public key instead of encrypting a random key and then symmetrically encrypting the data with that random key. But this is not a good idea as explained in Thomas Pornin's answer to In PGP, why not just encrypt message with recipient's public key? Why the meta-encryption?.

In any case ECIES uses a symmetric encryption algorithm to actually encrypt the data, so even if you use ECC to encrypt all the data, you're still encrypting it with a random symmetric key. But if you're encrypting the data itself with ECIES you could use a simple XOR as the symmetric encryption algorithm.