Synaptic Packagers Error - uses weak algorithm

[lynchie]

Newby to LinuxLite, trying to reload and update synaptic packages but getting the following messages.

W: https://ppa.launchpadcontent.net/mozilla.../InRelease: Signature by key 0AB215679C571D1C8325275B9BDB3D89CE49EC21 uses weak algorithm (rsa1024)

W: https://ppa.launchpadcontent.net/mozilla.../InRelease: Signature by key 0AB215679C571D1C8325275B9BDB3D89CE49EC21 uses weak algorithm (rsa1024)

Any help and suggestions would be appreciated. Note, that I am 74 years old and still use fingers and toes to count, so please reply accordingly.