Prevention of denial of service attacks

A method, wherein a first acknowledgement was determined based at least in part on a first hash value from applying a hash function to a source of a communication initiation request and a first time stamp, the method comprising:

• receiving a second acknowledgement responsive to the first acknowledgement;
• identifying a second source corresponding to the second acknowledgment;
• determining a second hash value by applying the hash function to the second source;
• extracting the first time stamp from the second acknowledgement;
• and
• establishing a communication session based at least in part on comparing the first and second hash values.

An article, comprising a processing device accessible media storing data for operating one or more processing devices, wherein a first acknowledgement is determined based at least in part on a first hash value from applying a hash function to a source of a communication initiation request and a first time stamp, and wherein the data, when accessed, results in the one or more processing devices performing:

• receiving a second acknowledgement responsive to the first acknowledgement;
• identifying a second source corresponding to the second acknowledgment;
• determining a second hash value by applying the hash function to at least the second source;
• extracting the first time stamp from the second acknowledgement;
• and
• establishing a communication session based at least in part on comparing the first and second hash values.

A system of cooperatively executing circuitry, comprising:

• a first circuitry configured to perform accessing a first acknowledgement based at least in part on a first hash value determined based at least in part on applying a hash function to a communication initiation request and a first time stamp;
• a second circuitry configured to perform accessing a second acknowledgement responsive to the first acknowledgement, identifying a second source corresponding to the second acknowledgment, determining a second hash value by applying the hash function to the second source, extracting the first time stamp from the second acknowledgement;
• and
• a third circuitry configured to perform establishing a communication session based at least in part on comparing the first and second hash values.