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$\begingroup$ So why exactly can I decrypt the message with the same public key used for encryption? $\endgroup$

Andy
– Andy

2019-08-15 13:57:06 +00:00
Commented Aug 15, 2019 at 13:57
1

$\begingroup$ The same key can be computed either from (Alice PK, Bob SK) or (Bob PK, Alice SK). This is the key actually used for encryption, and decryption. $\endgroup$

Frank Denis
– Frank Denis

2019-08-15 14:02:24 +00:00
Commented Aug 15, 2019 at 14:02
$\begingroup$ So this is ECDH with some symmetric cipher then? On the website, they mention not a single bit about DH. $\endgroup$

Andy
– Andy

2019-08-15 14:18:53 +00:00
Commented Aug 15, 2019 at 14:18
3

$\begingroup$ Yes, crypto_box() is ECDH using X25519, and encryption using salsa20poly1305. $\endgroup$

Frank Denis
– Frank Denis

2019-08-15 16:25:52 +00:00
Commented Aug 15, 2019 at 16:25

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