doc: Use https URLs where possible

1 files changed, 2 insertions, 2 deletions

diff --git a/src/key.cpp b/src/key.cpp
index 1ed5c1bea3..1e59b301cb 100644
--- a/src/key.cpp
+++ b/src/key.cpp
@@ -18,7 +18,7 @@ static secp256k1_context* secp256k1_context_sign = nullptr;
 
 /**
  * This parses a format loosely based on a DER encoding of the ECPrivateKey type from
- * section C.4 of SEC 1 <http://www.secg.org/sec1-v2.pdf>, with the following caveats:
+ * section C.4 of SEC 1 <https://www.secg.org/sec1-v2.pdf>, with the following caveats:
  *
  * * The octet-length of the SEQUENCE must be encoded as 1 or 2 octets. It is not
  *   required to be encoded as one octet if it is less than 256, as DER would require.
@@ -80,7 +80,7 @@ int ec_seckey_import_der(const secp256k1_context* ctx, unsigned char *out32, con
 
 /**
  * This serializes to a DER encoding of the ECPrivateKey type from section C.4 of SEC 1
- * <http://www.secg.org/sec1-v2.pdf>. The optional parameters and publicKey fields are
+ * <https://www.secg.org/sec1-v2.pdf>. The optional parameters and publicKey fields are
  * included.
  *
  * seckey must point to an output buffer of length at least CKey::SIZE bytes.