Providing random numbers over an insecure channel using disguised cyphertexts

A method comprising:

• generating, by a key deliver center (KDC), a first random number;
• encrypting, by the KDC, the first random number using a block encryption key to obtain a first cyphertext;
• transforming, by the KDC, the first cyphertext using a transformation function to obtain a transformed first cyphertext;
• encrypting, by the KDC, the transformed first cyphertext using the block encryption key to obtain a second cyphertext;
• transmitting, by the KDC, the second cyphertext to a first secure access portal (SAP) application;
• and
• generating, by the KDC, a delivery key based at least on the first random number.

A computer-readable storage medium comprising program instructions that, when executed by a processor, cause the processor to:

• receive, by a first secure access portal (SAP) application, a first cyphertext from a key deliver center (KDC);
• decrypt, by the first SAP application, the first cyphertext using a block encryption key to obtain a transformed second cyphertext;
• de-transform, by the first SAP application, the transformed second cyphertext using a transformation function to obtain a second cyphertext;
• decrypt, by the first SAP application, the second cyphertext using the block encryption to obtain first a random number;
• and
• generate, by the first SAP application, a delivery key based at least on the first random number.