Technical information

Nonvolatile Parameter Database
2-188 AT+i Commands Reference Manual May 31, 2008
Secure Socket Protocol Parameters
+iCS - Define the SSL3/TLS Cipher Suite
Syntax: AT+iCS=n
Sets the cipher suite to be used in SSL3/TLS negotiations with a
secure server.
The default value '0' is the all-cipher selection. With this value,
W24 sends its full list of supported ciphers to the server. The server
selects the most appropriate cipher to use during the handshake
procedure. When a specific value is specified, W24 requires the
server to use that specific cipher.
Parameters: n = A supported cipher suite code, as defined in RFC2246.
Command Options:
n=0 Set cipher suite to 'propose all'. When CS is set to 'propose all',
W24 offers all supported cipher suites for SSL3/TLS negotiations.
The server selects the most appropriate cipher suite during the
handshake procedure.
n=4 Set cipher suite to SSL_RSA_WITH_RC4_128_MD5.
n=5 Set cipher suite to SSL_RSA_WITH_RC4_128_SHA.
n=10 Set cipher suite to SSL_RSA_WITH_3DES_EDE_CBC_SHA.
n=47 Set cipher suite to TLS_RSA_WITH_AES_128_CBC_SHA.
n=53 Set cipher suite to TLS_RSA_WITH_AES_256_CBC_SHA.
+1000 Set cipher suite to TLS_RSA_WITH_AES_256_CBC_SHA.
Default: 0 (Propose All).
Result Code:
I/OK If n is a supported cipher suite code.
I/ERROR Otherwise.
AT+iCS? Returns the current cipher suite value. The reply is followed by
I/OK.
AT+iCS=? Returns the message "0,4,5,10,47,53". The reply is followed by
I/OK.