Answer
Wireless Transport Layer Security (WTLS) is a security protocol that resides
between WTP and WDP layers in the WAP communications stack.
WTLS uses semantics adapted for a low bandwidth mobile device.
In this packet sizes are reduced by using bit-fields, defines a compressed
certificate format (smaller X.509 v3 structure). A few of the algorithms is it
uses are: RSA, ECC, DES, Triple DES, RC5, MD5, SHA1, etc