This study presents an anonymous signcryption scheme based on the elliptic curve cryptosystem, which combines the properties of elliptic curve cryptosystem and ring signature. While the signers are endowed with anonymity through the technique of ring signature, the elliptic curve cryptosystem achieves the advantages of high security, low computation load, and small bandwidth requirements. To integrate the advantages of these two applications, the resulting system reaches a highly secure and efficient anonymous signcryption scheme. Signcryption makes a session key unnecessary to be established in advance for each session; hence, transmission load is reduced, and efficiency of performance and transmission is enhanced.