Add hint for JA3/4

+ minor corrections

Author: drwetter

etc/client-simulation.wiresharked.md

@@ -1,4 +1,4 @@
-The file `client-simulation.wiresharked.txt` contains client handshake data manually harvested from a network capture and displayed best with Wireshark.
+The file `client-simulation.wiresharked.txt` contains client handshake data manually harvested from a network capture and displayed by Wireshark.
 The content needs to be added to `client-simulation.txt` which other part comes from the SSLlabs client API via `update_client_sim_data.pl`
 The whole process is manual but not too difficult.
 
@@ -11,16 +11,17 @@ The whole process is manual but not too difficult.
 * If needed sort for ClientHello.
 * Look for the ClientHello which matches the source IP + destination you had in mind. Check the destination hostname in the SNI extension so that you can be sure, it's the right traffic.
 * Edit `client-simulation.wiresharked.txt` and insert a new section, preferably by copying a previous version of the client from it.
-* Edit the *names* accordingly and *short*. The latter must not contain blanks.
+* Edit the *names* accordingly and the *short* description. The latter must not contain blanks.
 * Retrieve *handshakebytes* by marking the "TLS 1.x Record Layer" --> Copy --> As a hex stream.
-* For *ch_ciphers* mark "Cipher Suites" --> Copy --> As a hex stream, remove any leading GREASE ciphers (?a?a) and supply it to `~/utils/hexstream2cipher.sh`. For consistency reasons it is preferred you remove the TLS 1.3 ciphers before which start with TLS\*.
-* *ciphersuites* are TLS 1.3 ciphersuites. You can identify them as they currently are like 0x130?. Retrieve them from above see `~/utils/hexstream2cipher.sh`. They start with TLS\*.
+* For *ch_ciphers*: mark "Cipher Suites" --> Copy --> As a hex stream, remove any leading GREASE ciphers (?a?a) and supply it to `~/utils/hexstream2cipher.sh`. For consistency reasons it is preferred you remove the TLS 1.3 ciphers before which start with TLS\*.
+* *ciphersuites* are TLS 1.3 ciphersuites. You can identify them as they currently are normallky like 0x13\*\*. Retrieve them from above see `~/utils/hexstream2cipher.sh`. They start with TLS\*.
 * Figure out *protos* and *tlsvers* by looking at the *supported_versions* TLS extension (43=0x002b). May work only with recent clients. Be careful as some do not list all TLS versions here (OpenSSL 1.1.1 listed only TLS 1.2/1.3).
 * Adjust *lowest_protocol* and *highest_protocol* accordingly.
 * For *curves* mark the "supported groups" TLS extension --> Copy --> As a hex stream, remove any leading GREASE ciphers (?a?a) and supply it to `~/utils/hexstream2curves.sh`.
 * Retrieve *alpn* by looking at the "alpn" TLS extension 16 (=0x0010).
 * Review TLS extension 13 (=0x000d) "signature_algorithm" whether any SHA1 signature algorithm is listed. If not *requiresSha2* is true.
 * Leave *maxDhBits*/*minDhBits* and *minRsaBits*/*maxRsaBit* at -1, unless you know for sure what the client can handle.
-* Figure out the *services* by applying a good piece of human logic. A (modern) browser is probably "HTTP", OpenSSL or Java "ANY"  whereas Thunderbird supports a variety of protocols.
+* When using wireshark, copy also the ja3 and ja4 values accordingly, see e.g. like *java80442*.  This could be used in the future.
+* Figure out the *services* by applying a good piece of human logic or have a look at a different version of the client. A (modern) browser is probably "HTTP", OpenSSL or Java "ANY"  whereas Thunderbird supports a variety of protocols.
 * When you're done copy your inserted section from `client-simulation.wiresharked.txt` into `client-simulation.txt`.
 * Before submitting a PR: test it yourself! You can also watch it again via wireshark.