SJEA version 1.0 - Simple Java Encryption Algorithm. SJEA is a simple command-line binary encryption algorithm (symmetric block cipher) written in JAVA. It uses a password and a byte-vector array to scramble the input file.
Ikedectypt is a perl script to decrypt IKEv1 packets in libpcap formatted trace file.
You can use Ethereal(http://www.ethereal.com) to analyze decrypted trace.
Key information(first initialization vector, skeyid_e) is needed to be supplied by user.