Systems and Methods for Secure Online Communication

A system useful in secure online communication, wherein hash values that are likely to carry the intent of a conversation are used as factors in encoding of conversation, the system comprising:

• a homomorphic key server;
• a chat server;
• a first chat device having a chat memory;
• a second chat device registered at the homomorphic key server for communicating with the first chat device;
• and
• one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, the one or more programs including instructions for:
• generating a Unicode cipher table at the first chat device by obtaining an encryption key from the homomorphic key server to encrypt the Unicode cipher table;
• generating in the chat memory a hash value for the Unicode cipher table;
• erasing the hash value from the chat memory when the first chat device is disconnected from the chat server;
• initiating a chat message at the first chat device, wherein the first chat device encodes the chat message by using the Unicode cipher table with the hash value to determine an encoded message;
• storing the encoded message in a server memory of the chat server;
• receiving the Unicode cipher table at the second chat device, wherein the second chat device obtains the homomorphic key from the homomorphic key server for decrypting of the Unicode cipher table;
• and
• obtaining the encoded message from the chat server at the second chat device, wherein the second chat device decodes the encoded message by using the Unicode cipher table, and the hash value is not known to the second chat device.

A chat history deletion method useful in safeguarding privacy, the method comprising:

• at an online communication system including a chat server having a chat memory and a plurality of communication devices:
• sending a first acknowledgement from the chat server to a first communication device after receiving a chat message initiated from the first communication device;
• determining receiving of the first acknowledgement at the first communication device;
• in response to determining receiving of the first acknowledgement, the first communication device deletes all traces of the chat message;
• sending a second acknowledgement from a second communication device to the chat server after receiving of the chat message at the second communication device;
• determining count of acknowledgements received at the chat server equals to count of communication devices;
• in response to determining count of acknowledgements received at the chat server equals to count of communication devices, deleting all traces of the chat message from the chat memory of the chat server;
• and
• deleting all traces of the chat message from the second communication device after displaying of the chat message on the device.