typedef enum { ... } SilcSKESecurityPropertyFlag

    SKE security property flags as defined by the SK protocol.

    typedef enum {
      SILC_SKE_SP_FLAG_NONE         = 0x00,  /* No flags */
      SILC_SKE_SP_FLAG_IV_INCLUDED  = 0x01,  /* IV included in packet */
      SILC_SKE_SP_FLAG_PFS          = 0x02,  /* Perfect Forward Secrecy */
      SILC_SKE_SP_FLAG_MUTUAL       = 0x04,  /* Mutual authentication */
    } SilcSKESecurityPropertyFlag;