In some embodiments, techniques for computer security comprise presenting a data field in a spoof-resistant manner, receiving field data, and securing field data. In some embodiments, the integrity of an input device may be verified.In some embodiments, techniques for computer security comprise hashing a credential and a characteristic associated with a data recipient, and performing password-authenticated key agreement using the hashed value.In some embodiments, techniques for computer security comprise monitoring an input, determining that the input is associated with confidential information, and enabling secure data entry.