1. A method of preventing a password from being presented in a data entry field on a computer display comprising: responsive to user entry of a character set in the data entry field, comparing the character set to a securely stored password set for a potential match of the character set with leading characters of a password in the password set; responsive to detecting a match, inhibiting presentation of at least one character of the character set in the data entry field; and responsive to detecting a lack of a match, presenting the character set in the data entry field.