Atmel "secure" crypto co-processor series microprocessors (AT91SAM7XC) leaking keys, plus bonus DESFire hack

The Atmel AT91SAM7XC series of microprocessors contain a crypto co-processor which is DES and AES capable. They include a write-only memory for key storage and multiple physical security measures to prevent decapping etc. However, due to poor memory management, in certain circumstances it is...