Abstract: Cloud computing is the relevant technology for this decade. It allows users to store huge amount of data in cloud storage and use as and when required, from anywhere in the world, through any kind of terminal equipment. Since cloud computing relies on internet, cloud data will be forced to contend with security issues like privacy, data security, confidentiality, and authentication. In order to get rid of the same, a variety of encryption algorithms and mechanisms are used. This paper, introduces use of hybrid cryptographic algorithm blended with digital signature and Diffie Hellman key exchange.. The hybrid algorithm is designed using the combination of Advanced Encryption Standard (AES) and Data Encryption Standard (DES) encryption algorithm to protect confidentiality of data stored in cloud. Even if the key in transmission is hacked, the facility of Diffie Hellman key exchange render it useless, since key in transit is of no use without user’s private key, which is confined only to the legitimate user. This proposed architecture of hybrid algorithm makes it tough for hackers to crack the security and integrity of the system, thereby protecting data stored in cloud.